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INFORMATICA INTERVIEW QUESTIONS - Extracted from GeekInterview.com by Deepak Babu http://prdeepakbabu.wordpress.com

DISCALIMER: The questions / data available here are from geekinterview.com. It has been compiled to single document for the ease of browsing through the informatica relevant questions. For any details, please refer www.geekinterview.com. We are not responsible for any data inaccuracy.

1.Informatica - Why we use lookup transformations?

QUESTION #1 Lookup Transformations can access data from relational tables that are not sources in mapping. With Lookup transformation, we can accomplish the following tasks: Get a related value-Get the Employee Name from Employee table based on the Employee IDPerform Calculation. Update slowly changing dimension tables - We can use unconnected lookup transformation to determine whether the records already exist in the target or not. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

January 19, 2006 01:12:33 sithusithu

Member Since: December 2005 Contribution: 161

RE: Why we use lookup transformations?

======================================= Nice Question If we don't have a look our datawarehouse will be have more unwanted duplicates Use a Lookup transformation in your mapping to look up data in a relational table view or synonym. Import a lookup definition from any relational database to which both the Informatica Client and Server can connect. You can use multiple Lookup transformations in a mapping Cheers Sithu

file:///C|/Perl/bin/result.html (1 of 363)4/1/2009 7:50:58 PM


======================================= Lookup Transformations used to search data from relational tables/FLAT Files that are not used in mapping. Types of Lookup: 1. Connected Lookup 2. UnConnected Lookup ======================================= The main use of lookup is to get a related value either from a relational sources or flat files ======================================= The following reasons for using lookups.....

1)We use Lookup transformations that query the largest amounts of data to improve overall performance. By doing that we can reduce the number of lookups on the same table.

2)If a mapping contains Lookup transformations we will enable lookup caching if this option is not enabled . We will use a persistent cache to improve performance of the lookup whenever possible. We will explore the possibility of using concurrent caches to improve session performance. We will use the Lookup SQL Override option to add a WHERE clause to the default SQL statement if it is not defined We will add ORDER BY clause in lookup SQL statement if there is no order by defined. We will use SQL override to suppress the default ORDER BY statement and enter an override ORDER BY with fewer columns. Indexing the Lookup Table We can improve performance for the following types of lookups: For cached lookups we will index the lookup table using the columns in the lookup ORDER BY statement. For Un-cached lookups we will Index the lookup table using the columns in the lookup where condition. file:///C|/Perl/bin/result.html (2 of 363)4/1/2009 7:50:58 PM


3)In some cases we use lookup instead of Joiner as lookup is faster than joiner in some cases when lookup contains the master data only.

4)This lookup helps in terms of performance tuning of the mappings also.

======================================= Look up Transformation is like a set of Reference for the traget table.For example suppose you are travelling by an auto ricksha..In the morning you notice that the auto driver showing you some card and saying that today onwards there is a hike in petrol.so you have to pay more. So the card which he is showing is a set of reference for there costumer..In the same way the lookup transformation works. These are of 2 types : a) Connected Lookup b) Un-connected lookup Connected lookup is connected in a single pipeline from a source to a target where as Un Connected Lookup is isolated with in the mapping and is called with the help of a Expression Transformation.

======================================= Look up tranformations are used to Get a related value Updating slowly changing dimension Caluculating expressions =======================================

2.Informatica - While importing the relational source definition from database, what are the meta data of source U i QUESTION #2 Source name Database location Column names Datatypes Key constraints

Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer.



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September 28, 2006 06:30:08 srinvas vadlakonda RE: While importing the relational source defintion fr...

======================================= source name data types key constraints database location ======================================= Relational sources are tables views synonyms. Source name Database location Column name Datatype Key Constraints. For synonyms you will have to manually create the constraints. =======================================

3.Informatica - How many ways you can update a relational source defintion and what r they? QUESTION #3 Two ways 1. Edit the definition 2. Reimport the defintion

Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

January 30, 2006 04:59:06 gazulas

Member Since: January 2006 Contribution: 17

RE: How many ways you can update a relational source d...

======================================= in 2 ways we can do it 1) by reimport the source definition 2) by edit the source definition

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4.Informatica - Where should U place the flat file to import the file:///C|/Perl/bin/result.html (4 of 363)4/1/2009 7:50:58 PM


flat file defintion to the designer? QUESTION #4 Place it in local folder Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 13, 2005 08:42:59

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rishi RE: Where should U place the flat file to import the f...

======================================= There is no such restrication to place the source file. In performance point of view its better to place the file in server local src folder. if you need path please check the server properties availble at workflow manager. It doesn't mean we should not place in any other folder if we place in server src folder by default src will be selected at time session creation.

======================================= file must be in a directory local to the client machine. ======================================= Basically the flat file should be stored in the src folder in the informatica server folder. Now logically it should pick up the file from any location but it gives an error of invalid identifier or not able to read the first row. So its better to keep the file in the src folder.which is already created when the informatica is installed ======================================= We can place source file any where in network but it will consume more time to fetch data from source file but if the source file is present on server srcfile then it will fetch data from source upto 25 times faster than previous. =======================================

5.Informatica - To provide support for Mainframes source data, which files r used as a source definitions? QUESTION #5 COBOL files

Click Here to view complete document



No best answer available. Please pick the good answer available or submit your answer. October 07, 2005 11:49:42

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Shaks Krishnamurthy RE: To provide support for Mainframes source data,whic...

======================================= COBOL Copy-book files ======================================= The mainframe files are Used as VSAM files in Informatica by using the Normaliser transformation =======================================

6.Informatica - Which transformation should u need while using the cobol sources as source defintions?

QUESTION #6 Normalizer transformaiton which is used to normalize the data. Since cobol sources r oftenly consists of Denormailzed data. Click Here to view complete document Submitted by: sithusithu

Normalizer transformaiton Cheers, Sithu

Above answer was rated as good by the following members: ramonasiraj ======================================= Normalizer transformaiton Cheers Sithu



======================================= Normalizer transformaiton which is used to normalize the data =======================================

7.Informatica - How can U create or import flat file definition in to the warehouse designer?

QUESTION #7 U can not create or import flat file defintion in to warehouse designer directly.Instead U must analyze the file in source analyzer,then drag it into the warehouse designer.When U drag the flat file source defintion into warehouse desginer workspace,the warehouse designer creates a relational target defintion not a file defintion.If u want to load to a file,configure the session to write to a flat file.When the informatica server runs the session,it creates and loads the flatfile. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. August 22, 2005 03:23:12

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Praveen RE: How can U create or import flat file definition in to the warehouse designer?

======================================= U can create flat file definition in warehouse designer.in the warehouse designer u can create new target: select the type as flat file. save it and u can enter various columns for that created target by editing its properties.Once the target is created save it. u can import it from the mapping designer. ======================================= Yes you can import flat file directly into Warehouse designer. This way it will import the field definitions directly. ======================================= 1) Manually create the flat file target definition in warehouse designer 2)create target definition from a source definition. This is done my dropping a source definition in warehouse designer. 3)Import flat file definitionusing a flat file wizard. ( file must be local to the client machine) ======================================= While creating flatfiles manually we drag and drop the structure from SQ if the structure we need is the same as of source for this we need to check-in the source and then drag and drop it into the Flatfile if



not all the columns in the source will be changed as primary keys. =======================================

8.Informatica - What is the maplet?

QUESTION #8 Maplet is a set of transformations that you build in the maplet designer and U can use in multiple mapings. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 08, 2005 23:38:47

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phani RE: What is the maplet?

======================================= For Ex:Suppose we have several fact tables that require a series of dimension keys.Then we can create a mapplet which contains a series of Lkp transformations to find each dimension key and use it in each fact table mapping instead of creating the same Lkp logic in each mapping. ======================================= Part(sub set) of the Mapping is known as Mapplet Cheers Sithu

======================================= Set of transforamations where the logic can be reusble ======================================= A mapplet should have a mapplet input transformation which recives input values and a output transformation which passes the final modified data to back to the mapping. when the mapplet is displayed with in the mapping only input & output ports are displayed so that the internal logic is hidden from end-user point of view.

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Reusable mapping is known as mapplet & reusable transformation with mapplet ======================================= Maplet is a reusable business logic which can be used in mappings ======================================= A maplet is a reusable object which contains one or more than one transformation which is used to populate the data from source to target based on the business logic and we can use the same logic in different mappings without creating the mapping again. ======================================= Mapplet Is In Mapplet Designer It is used to create Mapplets. ======================================= A mapplet is a reusable object that represents a set of transformations. Mapplet can be designed using mapping designer in informatica power center ======================================= Basically mapplet is a subset of the mapping in which we can have the information of the each dimension keys by keeping the different mappings created individually. If we want a series of dimension keys in the final fact table we will use mapping designer. =======================================

9.Informatica - what is a transforamation?

QUESTION #9 It is a repostitory object that generates,modifies or passes data. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. November 23, 2005 16:06:23 sir RE: what is a transforamation?

======================================= a transformation is repository object that pass data to the next stage(i.e to the next transformation or target) with/with out modifying the data ======================================= It is a process of converting given input to desired output. ======================================= set of operation Cheers Sithu file:///C|/Perl/bin/result.html (9 of 363)4/1/2009 7:50:58 PM

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======================================= Transformation is a repository object of converting a given input to desired output.It can generates modifies and passes the data. ======================================= A TransFormation Is a Repository Object. That Generates Modifies or Passes Data. The Designer Provides a Set of Transformations That perform Specific Functions. For Example An AGGREGATOR Transformation Performs Calculations On Groups Of Data. =======================================

10.Informatica - What r the designer tools for creating tranformations? QUESTION #10 Mapping designer Tansformation developer Mapplet designer Click Here to view complete document

No best answer available. Please pick the good answer available or submit your answer. February 21, 2007 05:29:40 MANOJ KUMAR PANIGRAHI RE: What r the designer tools for creating tranformati...

======================================= There r 2 type of tool r used 4 creating transformation......just like Mapping designer Mapplet designer ======================================= Mapping Designer Maplet Designer Transformation Deveoper - for reusable transformation =======================================

11.Informatica - What r the active and passive transforamtions?

QUESTION #11 An active transforamtion can change the number of rows that file:///C|/Perl/bin/result.html (10 of 363)4/1/2009 7:50:58 PM

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pass through it.A passive transformation does not change the number of rows that pass through it. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What r the active and passive transforamtions?

======================================= Transformations can be active or passive. An active transformation can change the number of rows that pass through it such as a Filter transformation that removes rows that do not meet the filter condition. A passive transformation does not change the number of rows that pass through it such as an Expression transformation that performs a calculation on data and passes all rows through the transformation. Cheers Sithu

======================================= Active Transformation : A Transformation which change the number of rows when data is flowing from source to target Passive Transformation : A transformation which does not change the number of rows when the data is flowing from source to target =======================================

12.Informatica - What r the connected or unconnected transforamations?

QUESTION #12 An unconnected transforamtion is not connected to other transformations in the mapping.Connected transforamation is connected to other transforamtions in the mapping. Click Here to view complete document file:///C|/Perl/bin/result.html (11 of 363)4/1/2009 7:50:58 PM


No best answer available. Please pick the good answer available or submit your answer. August 22, 2005 03:26:32

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Praveen RE: What r the connected or unconnected transforamations?

======================================= An unconnected transformation cant be connected to another transformation. but it can be called inside another transformation. ======================================= Here is the deal Connected transformation is a part of your data flow in the pipeline while unconnected Transformation is not. much like calling a program by name and by reference. use unconnected transforms when you wanna call the same transform many times in a single mapping.

======================================= In addition to first answer uncondition transformation are directly connected and can/used in as many as other transformations. If you are using a transformation several times use unconditional. You get better performance.

======================================= Connect Transformation : A transformation which participates in the mapping data flow Connected transformation can receive multiple inputs and provides multiple outputs Unconnected : A unconnected transformation does not participate in the mapping data flow It can receive multiple inputs and provides single output file:///C|/Perl/bin/result.html (12 of 363)4/1/2009 7:50:58 PM


Thanks Rekha

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13.Informatica - How many ways u create ports? QUESTION #13 Two ways 1.Drag the port from another transforamtion 2.Click the add buttion on the ports tab. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 28, 2006 06:31:21

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srinivas.vadlakonda RE: How many ways u create ports?

======================================= Two ways 1.Drag the port from another transforamtion 2.Click the add buttion on the ports tab. ======================================= we can copy and paste the ports in the ports tab =======================================

14.Informatica - What r the reusable transforamtions?

QUESTION #14 Reusable transformations can be used in multiple mappings. When u need to incorporate this transformation into maping,U add an instance of it to maping.Later if U change the definition of the transformation ,all instances of it inherit the changes.Since the instance of reusable transforamation is a pointer to that transforamtion,U can change the transforamation in the transformation developer,its instances automatically reflect these changes.This feature can save U great deal of work. Click Here to view complete document Submitted by: sithusithu file:///C|/Perl/bin/result.html (13 of 363)4/1/2009 7:50:58 PM


A transformation can reused, that is know as reusable transformation You can design using 2 methods 1. using transformation developer 2. create normal one and promote it to reusable

Cheers Sithu Above answer was rated as good by the following members: ramonasiraj ======================================= A transformation can reused that is know as reusable transformation You can design using 2 methods 1. using transformation developer 2. create normal one and promote it to reusable Cheers Sithu

======================================= Hai to all friends out there the transformation that can be reused is called a reusable transformation. as the property suggests it has to be reused: so for reusing we can do it in two different ways 1) by creating normal transformation and making it reusable by checking it in the check box of the properties of the edit transformation. 2) by using transformation developer here what ever transformation is developed it is reusable and it can be used in mapping designer where we can further change its properties as per our requirement.



======================================= 1. A reusable transformation can be used in multiple transformations 2.The designer stores each reusable transformation as metada separate from any mappings that use the transformation. 3. Every reusable transformation falls within a category of transformations available in the Designer 4.one can only create an External Procedure transformation as a reusable transformation. =======================================

15.Informatica - What r the methods for creating reusable transforamtions?

QUESTION #15 Two methods 1.Design it in the transformation developer. 2.Promote a standard transformation from the mapping designer.After U add a transformation to the mapping , U can promote it to the status of reusable transformation. Once U promote a standard transformation to reusable status,U can demote it to a standard transformation at any time. If u change the properties of a reusable transformation in mapping,U can revert it to the original reusable transformation properties by clicking the revert button. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 12, 2005 12:22:21 Praveen Vasudev RE: methods for creating reusable transforamtions?


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======================================= PLEASE THINK TWICE BEFORE YOU POST AN ANSWER. Answer: Two methods 1.Design it in the transformation developer. by default its a reusable transform. 2.Promote a standard transformation from the mapping designer.After U add a transformation to the mapping U can promote it to the status of reusable transformation. Once U promote a standard transformation to reusable status U CANNOT demote it to a standard transformation at any time. If u change the properties of a reusable transformation in mapping U can revert it to the original reusable transformation properties by clicking the revert button.

======================================= You can design using 2 methods 1. using transformation developer 2. create normal one and promote it to reusable Cheers Sithu

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16.Informatica - What r the unsupported repository objects for a mapplet? QUESTION #16 COBOL source definition Joiner transformations Normalizer transformations Non reusable sequence generator transformations. Pre or post session stored procedures Target defintions Power mart 3.5 style Look Up functions XML source definitions IBM MQ source defintions






RE: What r the unsupported repository objects for a ma...

======================================= ● Source definitions. Definitions of database objects (tables views synonyms) or files that provide source data. ● Target definitions. Definitions of database objects or files that contain the target data. ● Multi-dimensional metadata. Target definitions that are configured as cubes and dimensions. ● Mappings. A set of source and target definitions along with transformations containing business logic that you build into the transformation. These are the instructions that the Informatica Server uses to transform and move data. ● Reusable transformations. Transformations that you can use in multiple mappings. ● Mapplets. A set of transformations that you can use in multiple mappings. ● Sessions and workflows. Sessions and workflows store information about how and when the Informatica Server moves data. A workflow is a set of instructions that describes how and when to run tasks related to extracting transforming and loading data. A session is a type of task that you can put in a workflow. Each session corresponds to a single mapping. Cheers Sithu

======================================= Hi The following answer is from Informatica Help Documnetation ●

You cannot include the following objects in a mapplet: ● ● ● ●

Normalizer transformations Cobol sources XML Source Qualifier transformations XML sources


file:///C|/Perl/bin/result.html ● ● ●

Target definitions Pre- and post- session stored procedures Other mapplets

Shivaji Thaneru

======================================= normaliser xml source qualifier and cobol sources cannot be used ======================================= −Normalizer transformations −Cobol sources −XML Source Qualifier transformations −XML sources −Target definitions −Pre- and post- session stored procedures −Other mapplets -PowerMart 3.5-style LOOKUP functions -non reusable sequence generator =======================================

17.Informatica - What r the mapping paramaters and maping variables?

QUESTION #17 Maping parameter represents a constant value that U can define before running a session.A mapping parameter retains the same value throughout the entire session. When u use the maping parameter ,U declare and use the parameter in a maping or maplet.Then define the value of parameter in a parameter file for the session. Unlike a mapping parameter,a maping variable represents a value that can change throughout the session.The informatica server saves the value of maping variable to the repository at the end of session run and uses that value next time U run the session. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 12, 2005 12:30:13 Praveen Vasudev


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RE: mapping varibles

======================================= Please refer to the documentation for more understanding. Mapping variables have two identities: Start value and Current value Start value Current value ( when the session starts the execution of the undelying mapping) Start value <> Current value ( while the session is in progress and the variable value changes in one ore more occasions) Current value at the end of the session is nothing but the start value for the subsequent run of the same session.

======================================= You can use mapping parameters and variables in the SQL query user-defined join and source filter of a Source Qualifier transformation. You can also use the system variable $$$SessStartTime. The Informatica Server first generates an SQL query and scans the query to replace each mapping parameter or variable with its start value. Then it executes the query on the source database. Cheers Sithu

======================================= Mapping parameter represents a constant value defined before mapping run. Mapping reusability can be achieved by using mapping parameters.



Mapping variable represents a value that can be changed during the mapping run. Mapping variable can be used in incremental loading process.

=======================================

18.Informatica - Can U use the maping parameters or variables created in one maping into another maping?

QUESTION #18 NO. We can use mapping parameters or variables in any transformation of the same maping or mapplet in which U have created maping parameters or variables. Click Here to view complete document Submitted by: Ray NO. You might want to use a workflow parameter/variable if you want it to be visible with other mappings/sessions Above answer was rated as good by the following members: ramonasiraj ======================================= NO. You might want to use a workflow parameter/variable if you want it to be visible with other mappings/sessions ======================================= Hi The following sentences extracted from Informatica help as it is.Did it support the above to answers. After you create a parameter you can use it in the Expression Editor of any transformation in a mapping or mapplet. You can also use it in Source Qualifier transformations and reusable transformations. Shivaji Thaneru

======================================= I differ on this; we can use global variable in sessions as well as in mappings. This provision is provided in Informatica 7.1.x versions; I have used it. Please check this in properties. Regards -Vaibhav ======================================= hi file:///C|/Perl/bin/result.html (20 of 363)4/1/2009 7:50:58 PM


Thanx Shivaji but the statement does not completely answer the question. a mapping parameter can be used in reusable transformation but does it mean u can use the mapping parameter whereever the instances of the reusable transformation are used? ======================================= The scope of a mapping variable is the mapping in which it is defined. A variable Var1 defined in mapping Map1 can only be used in Map1. You cannot use it in another mapping say Map2.

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19.Informatica - Can u use the maping parameters or variables created in one maping into any other reusable transform

QUESTION #19 Yes.Because reusable tranformation is not contained with any maplet or maping. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

February 02, 2007 17:06:04 mahesh4346


RE: Can u use the maping parameters or variables creat...

======================================= But when one cant use Mapping parameters and variables of one mapping in another Mapping then how can that be used in reusable transformation when Reusable transformations themselves can be used among multiple mappings?So I think one cant use Mapping parameters and variables in reusable transformationsPlease correct me if i am wrong ======================================= Hi you can use the mapping parameters or variables in a reusable transformation. And when you use the xformation in a mapping during execution of the session it validates if the mapping parameter that is used in the xformation is defined with this mapping or not. If not the session fails. =======================================

20.Informatica - How can U improve session performance in aggregator transformation? QUESTION #20 Use sorted input. file:///C|/Perl/bin/result.html (21 of 363)4/1/2009 7:50:58 PM


Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 12, 2005 12:34:09

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Praveen Vasudev RE:

======================================= use sorted input: 1. use a sorter before the aggregator 2. donot forget to check the option on the aggregator that tell the aggregator that the input is sorted on the same keys as group by. the key order is also very important.

======================================= hi You can use the following guidelines to optimize the performance of an Aggregator transformation. Use sorted input to decrease the use of aggregate caches. Sorted input reduces the amount of data cached during the session and improves session performance. Use this option with the Sorter transformation to pass sorted data to the Aggregator transformation. Limit connected input/output or output ports. Limit the number of connected input/output or output ports to reduce the amount of data the Aggregator transformation stores in the data cache. Filter before aggregating.



If you use a Filter transformation in the mapping place the transformation before the Aggregator transformation to reduce unnecessary aggregation. Shivaji T

======================================= Following are the 3 ways with which we can improve the session performance:-

a) Use sorted input to decrease the use of aggregate caches. b) Limit connected input/output or output ports c) Filter before aggregating (if you are using any filter condition)

======================================= By using Incrimental aggrigation also we can improve performence.Becaue it passes the new data to the mapping and uses historical data to perform aggrigation ======================================= to improve session performance in aggregator transformation enable the session option Incremental Aggregation ======================================= -Use sorted input to decrease the use of aggregate caches. -Limit connected input/output or output ports. Limit the number of connected input/output or output ports to reduce the amount of data the Aggregator transformation stores in the data cache. -Filter the data before aggregating it. =======================================

21.Informatica - What is aggregate cache in aggregator transforamtion?

QUESTION #21 The aggregator stores data in the aggregate cache until it completes aggregate calculations.When u run a session that uses an aggregator transformation,the informatica server creates index and data caches in memory to process the transformation.If the informatica server requires more space,it stores overflow values in cache files. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. file:///C|/Perl/bin/result.html (23 of 363)4/1/2009 7:50:58 PM


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RE: What is aggregate cache in aggregator transforamti...

======================================= When you run a workflow that uses an Aggregator transformation the Informatica Server creates index and data caches in memory to process the transformation. If the Informatica Server requires more space it stores overflow values in cache files. Cheers Sithu

======================================= Aggregate cache contains data values while aggregate calculations are being performed. Aggregate cache is made up of index cache and data cache. Index cache contains group values and data cache consists of row values. ======================================= when server runs the session with aggregate transformation it stores data in memory until it completes the aggregation when u partition a source the server creates one memory cache and one disk cache for each partition .it routes the data from one partition to another based on group key values of the transformation =======================================

22.Informatica - What r the diffrence between joiner transformation and source qualifier transformation?

QUESTION #22 U can join hetrogenious data sources in joiner transformation which we can not achieve in source qualifier transformation. U need matching keys to join two relational sources in source qualifier transformation.Where as u doesn’t need matching keys to join two sources. Two relational sources should come from same datasource in sourcequalifier.U can join relatinal sources which r coming from diffrent sources also. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer.



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RE: What r the diffrence between joiner transformation...

======================================= Source qualifier Homogeneous source Joiner Heterogeneous source Cheers Sithu

======================================= Hi The Source Qualifier transformation provides an alternate way to filter rows. Rather than filtering rows from within a mapping the Source Qualifier transformation filters rows when read from a source. The main difference is that the source qualifier limits the row set extracted from a source while the Filter transformation limits the row set sent to a target. Since a source qualifier reduces the number of rows used throughout the mapping it provides better performance. However the Source Qualifier transformation only lets you filter rows from relational sources while the Filter transformation filters rows from any type of source. Also note that since it runs in the database you must make sure that the filter condition in the Source Qualifier transformation only uses standard SQL. Shivaji Thaneru

======================================= hi as per my knowledge you need matching keys to join two relational sources both in Source qualifier as well as in Joiner transformation. But the difference is that in Source qualifier both the keys must have primary key - foreign key relation Whereas in Joiner transformation its not needed.



======================================= source qualifier is used for reading the data from the database where as joiner transformation is used for joining two data tables. source qualifier can also be used to join two tables but the condition is that both the table should be from relational database and it should have the primary key with the same data structure. using joiner we can join data from two heterogeneous sources like two flat files or one file from relational and one file from flat. =======================================

23.Informatica - In which condtions we can not use joiner transformation(Limitaions of joiner transformation)?

QUESTION #23 Both pipelines begin with the same original data source. Both input pipelines originate from the same Source Qualifier transformation. Both input pipelines originate from the same Normalizer transformation. Both input pipelines originate from the same Joiner transformation. Either input pipelines contains an Update Strategy transformation. Either input pipelines contains a connected or unconnected Sequence Generator transformation. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. January 25, 2006 12:18:35 Surendra RE: In which condtions we can not use joiner transform...

======================================= This is no longer valid in version 7.2 Now we can use a joiner even if the data is coming from the same source. SK

======================================= You cannot use a Joiner transformation in the following situations(according to infa 7.1): file:///C|/Perl/bin/result.html (26 of 363)4/1/2009 7:50:58 PM

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♦Either input pipeline contains an Update Strategy transformation. ♦You connect a Sequence Generator transformation directly before the Joiner transformation. ======================================= I don't understand the second one which says we have a sequence generator? Please can you explain on that one? ======================================= Can you please let me know the correct and clear answer for Limitations of joiner transformation? swapna ======================================= You cannot use a Joiner transformation in the following situations(according to infa 7.1): When You connect a Sequence Generator transformation directly before the Joiner transformation. for more information check out the informatica manual7.1 ======================================= What about join conditions. Can we have a ! condition in joiner. ======================================= No in a joiner transformation you can only use an equal to ( ) as a join condition Any other sort of comparison operators is not allowed > < ! <> etc are not allowed as a join condition Utsav ======================================= Yes joiner only supports equality condition The Joiner transformation does not match null values. For example if both EMP_ID1 and EMP_ID2 from the example above contain a row with a null value the PowerCenter Server does not consider them a match and does not join the two rows. To join rows with null values you can replace null input with default values and then join on the default values.

======================================= We cannot use joiner transformation in the following two conditions:1. When our data comes through Update Strategy transformation or in other words after Update strategy we cannot add joiner transformation 2. We cannot connect a Sequence Generator transformation directly before the Joiner transformation. =======================================

24.Informatica - what r the settiings that u use to cofigure the joiner transformation? file:///C|/Perl/bin/result.html (27 of 363)4/1/2009 7:50:58 PM


QUESTION #24 Master and detail source Type of join Condition of the join Click Here to view complete document Submitted by: sithusithu

● ● ●

Master and detail source Type of join Condition of the join

the Joiner transformation supports the following join types, which you set in the Properties tab: ● ● ● ●

Normal (Default) Master Outer Detail Outer Full Outer

Cheers, Sithu

Above answer was rated as good by the following members: vivek1708 ======================================= ● ● ●

Master and detail source Type of join Condition of the join

the Joiner transformation supports the following join types which you set in the Properties tab: ● ● ● ●




Cheers Sithu

======================================= There are number of properties that you use to configure a joiner transformation are:

1) CASE SENSITIVE STRING COMPARISON: To join the string based on the case sensitive basis.

2) WORKING DIRECTORY: Where to create the caches.

3) JOIN CONDITION : Like join on a.s v.n

4) JOIN TYPE: (Normal or master or detail or full)

5) NULL ORDERING IN MASTER

6) NULL ORDERING IN DETAIL

7) TRACING LEVEL: Level of detail about the operations.

8) INDEX CACHE: Store group value of the input if any.

9) DATA CACHE: Store value of each row of data.

10) SORTED INPUT: Check box will be there and will have to check it if the input to the joiner is sorted.



11) TRANSFORMATION SCOPE: The data to taken into consideration. (transcation or all input) transaction if it depends only on the processed rows while look up if it depends on other data when it processes a row. Ex-joiner using the same source in the pipeline so data is within the scope so transaction. using a lookup so it depends on other data or if dynamic cache is enabled it has to process on the other incoming data so will have to go for all input.

=======================================

25.Informatica - What r the join types in joiner transformation? QUESTION #25 Normal (Default) Master outer Detail outer Full outer Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 12, 2005 12:38:39

#1

Praveen Vasudev RE:

======================================= Normal (Default) -- only matching rows from both master and detail Master outer -- all detail rows and only matching rows from master Detail outer -- all master rows and only matching rows from detail Full outer -- all rows from both master and detail ( matching or non matching) ======================================= follw this 1. In the Mapping Designer choose Transformation-Create. Select the Joiner transformation. Enter a name click OK. The naming convention for Joiner transformations is JNR_TransformationName. Enter a description for the transformation. This description appears in the Repository Manager making it easier for you or others to understand or remember what the transformation does.



The Designer creates the Joiner transformation. Keep in mind that you cannot use a Sequence Generator or Update Strategy transformation as a source to a Joiner transformation. 1. Drag all the desired input/output ports from the first source into the Joiner transformation. The Designer creates input/output ports for the source fields in the Joiner as detail fields by default. You can edit this property later. 1. Select and drag all the desired input/output ports from the second source into the Joiner transformation. The Designer configures the second set of source fields and master fields by default. 1. Double-click the title bar of the Joiner transformation to open the Edit Transformations dialog box. 1. Select the Ports tab. 1. Click any box in the M column to switch the master/detail relationship for the sources. Change the master/detail relationship if necessary by selecting the master source in the M column. Tip: Designating the source with fewer unique records as master increases performance during a join. 1. Add default values for specific ports as necessary. Certain ports are likely to contain NULL values since the fields in one of the sources may be empty. You can specify a default value if the target database does not handle NULLs. 1. Select the Condition tab and set the condition. 1. Click the Add button to add a condition. You can add multiple conditions. The master and detail ports must have matching datatypes. The Joiner transformation only supports equivalent ( ) joins: 10. Select the Properties tab and enter any additional settings for the transformations. 1. Click OK. 1. Choose Repository-Save to save changes to the mapping. Cheers



Sithu

=======================================

26.Informatica - What r the joiner caches?

QUESTION #26 When a Joiner transformation occurs in a session, the Informatica Server reads all the records from the master source and builds index and data caches based on the master rows. After building the caches, the Joiner transformation reads records from the detail source and perform joins. Click Here to view complete document Submitted by: bneha15 For version 7.x and above : When the PowerCenter Server processes a Joiner transformation, it reads rows from both sources concurrently and builds the index and data cache based on the master rows. The PowerCenter Server then performs the join based on the detail source data and the cache data. To improve performance for an unsorted Joiner transformation, use the source with fewer rows as the master source. To improve performance for a sorted Joiner transformation, use the source with fewer duplicate key values as the master. Above answer was rated as good by the following members: vivek1708 ======================================= From a performance perspective.always makes the smaller of the two joining tables to be the master. ======================================= Specifies the directory used to cache master records and the index to these records. By default the cached files are created in a directory specified by the server variable $PMCacheDir. If you override the directory make sure the directory exists and contains enough disk space for the cache files. The directory can be a mapped or mounted drive. Cheers Sithu ======================================= For version 7.x and above : When the PowerCenter Server processes a Joiner transformation it reads rows from both sources concurrently and builds the index and data cache based on the master rows. The PowerCenter Server then performs the join based on the detail source data and the cache data. To improve performance for an unsorted Joiner transformation use the source with fewer rows as the master source. To improve



performance for a sorted Joiner transformation use the source with fewer duplicate key values as the master. =======================================

27.Informatica - what is the look up transformation?

QUESTION #27 Use lookup transformation in u’r mapping to lookup data in a relational table,view,synonym. Informatica server queries the look up table based on the lookup ports in the transformation.It compares the lookup transformation port values to lookup table column values based on the look up condition. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 09, 2005 00:06:38

#1

phani RE: what is the look up transformation?

======================================= Using it we can access the data from a relational table which is not a source in the mapping. For Ex:Suppose the source contains only Empno but we want Empname also in the mapping.Then instead of adding another tbl which contains Empname as a source we can Lkp the table and get the Empname in target.

======================================= A lookup is a simple single-level reference structure with no parent/child relationships. Use a lookup when you have a set of reference members that you do not need to organize hierarchically. ======================================= In DecisionStream a lookup is a simple single-level reference structure with no parent/child relationships. Use a lookup when you have a set of reference members that you do not need to organize hierarchically.HTH ======================================= Use a Lookup transformation in your mapping to look up data in a relational table view or synonym. Import a lookup definition from any relational database to which both the Informatica Client and Server can connect. You can use multiple Lookup transformations in a mapping.



Cheers Sithu

======================================= Lookup transformation in a mapping is used to look up data in a flat file or a relational table view or synonym. You can import a lookup definition from any flat file or relational database to which both the PowerCenter Client and Server can connect. You can use multiple Lookup transformations in a mapping. I hope this would be helpful for you. Cheers Sridhar

=======================================

28.Informatica - Why use the lookup transformation ?

QUESTION #28 To perform the following tasks. Get a related value. For example, if your source table includes employee ID, but you want to include the employee name in your target table to make your summary data easier to read. Perform a calculation. Many normalized tables include values used in a calculation, such as gross sales per invoice or sales tax, but not the calculated value (such as net sales). Update slowly changing dimension tables. You can use a Lookup transformation to determine whether records already exist in the target. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. August 21, 2006 22:26:47 samba RE: Why use the lookup transformation ?


#1


======================================= Lookup table is nothing but the lookup on a table view synonym and falt file. by using lookup we can get a related value with join conditon and performs caluclations two types of lookups are there 1)connected 2)Unconnected connected lookup is with in pipeline only but unconnected lookup is not connected to pipeline unconneceted lookup returns single column value only let me know if you want to know any additions information cheers samba

======================================= hey with regard to look up is there a dynamic look up and static look up ? if so how do you set it. and is there a combinationation of dynamic connected lookups..and static unconnected look ups.? ======================================= look up has two types Connected and Unconnected..Usually we use look-up so as to get the related Value from a table ..it has Input port Output Port Lookup Port and Return Port..where Lookup Port looks up the corresponding column for the value and resturn port returns the value..usually we use when there are no columns in common ======================================= For maintaining the slowly changing diamensions ======================================= Hi The ans to ur question is Yes There are 2 types of lookups: Dynamic and Normal (which you have termed as Static). To configure just double click on the lookup transformation and go to properties tab file:///C|/Perl/bin/result.html (35 of 363)4/1/2009 7:50:58 PM


There'll be an option - dynamic lookup cache. select that... If u dont select this option then the lookup is merely a normal lookup. Please let me know if there are any questions. Thanks.

=======================================

29.Informatica - What r the types of lookup? QUESTION #29 Connected and unconnected Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. November 08, 2005 18:44:53 swati RE: What r the types of lookup?

======================================= i>connected ii>unconnected iii>cached iv>uncached

======================================= 1. Connected lookup 2. Unconnected lookup 1. file:///C|/Perl/bin/result.html (36 of 363)4/1/2009 7:50:58 PM

#1


Persistent cache 2. Re-cache from database 3. Static cache 4. Dynamic cache 5. Shared cache Cheers Sithu

======================================= hello boss/madam only two types of lookup are there they are: 1) Connected lookup 2) Unconnected lookup. I don't understand why people are specifying the cache types I want to know that now a days caches are also taken into this category of lookup. If yes do specify on the answer list thankyou =======================================

30.Informatica - Differences between connected and unconnected lookup? QUESTION #30

Connected lookup

Unconnected lookup

Receives input values diectly from the pipe line.

Receives input values from the result of a lkp expression in a another transformation.

U can use a dynamic or static cache

U can use a static cache.

Cache includes all lookup columns used in the maping

Cache includes all lookup out put ports in the lookup condition and the lookup/return port.

Support user defined default values

Does not support user defiend default values




February 03, 2006 03:25:15 Prasanna RE: Differences between connected and unconnected look...

======================================= In addition: Connected Lookip can return/pass multiple rows/groups of data whereas unconnected can return only one port.

======================================= In addition to this: In Connected lookup if the condition is not satisfied it returns '0'. In UnConnected lookup if the condition is not satisfied it returns 'NULL'. ======================================= Hi Differences Between Connected and Unconnected Lookups Connected Lookup

Unconnected Lookup

Receives input values directly from the pipeline.

Receives input values from the result of a :LKP expression in another transformation.

You can use a dynamic or static cache.

You can use a static cache.

Cache includes all lookup columns used in the mapping (that is lookup source columns included in the lookup condition and lookup source columns linked as output ports to other transformations).

Cache includes all lookup/output ports in the lookup condition and the lookup/return port.

Can return multiple columns from the same row or insert into the dynamic lookup cache.

Designate one return port (R). Returns one column from each row.



If there is no match for the lookup condition the PowerCenter Server returns the default value for all output ports. If you configure dynamic caching the PowerCenter Server inserts rows into the cache or leaves it unchanged.

If there is no match for the lookup condition the PowerCenter Server returns NULL.

If there is a match for the lookup condition the PowerCenter Server returns the result of the lookup condition for all lookup/output ports. If you configure dynamic caching the PowerCenter Server either updates the row the in the cache or leaves the row unchanged.

If there is a match for the lookup condition the PowerCenter Server returns the result of the lookup condition into the return port.

Pass multiple output values to another transformation. Link lookup/output ports to another transformation.

Pass one output value to another transformation. The lookup/output/return port passes the value to the transformation calling : LKP expression.

Supports user-defined default values.

Does not support user-defined default values.

Shivaji Thaneru

=======================================

31.Informatica - what is meant by lookup caches?

QUESTION #31 The informatica server builds a cache in memory when it processes the first row af a data in a cached look up transformation.It allocates memory for the cache based on the amount u configure in the transformation or session properties.The informatica server stores condition values in the index cache and output values in the data cache. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 28, 2006 06:34:33 srinivas vadlakonda RE: what is meant by lookup caches?


#1


======================================= lookup cache is the temporary memory that is created by the informatica server to hold the lookup data and to perform the lookup conditions ======================================= A LookUP Cache is a Temporary Memory Area which is Created by the Informatica Server. which stores the Lookup data based on certain Conditions. The Caches are of Three types 1) Persistent 2) Dynamic 3) Static and 4) Shared Cache.

=======================================

32.Informatica - What r the types of lookup caches?

QUESTION #32 Persistent cache: U can save the lookup cache files and reuse them the next time the informatica server processes a lookup transformation configured to use the cache. Recache from database: If the persistent cache is not synchronized with he lookup table,U can configure the lookup transformation to rebuild the lookup cache. Static cache: U can configure a static or readonly cache for only lookup table.By default informatica server creates a static cache.It caches the lookup table and lookup values in the cache for each row that comes into the transformation.when the lookup condition is true,the informatica server does not update the cache while it prosesses the lookup transformation. Dynamic cache: If u want to cache the target table and insert new rows into cache and the target,u can create a look up transformation to use dynamic cache. The informatica server dynamically inerts data to the target table. shared cache: U can share the lookup cache between multiple transactions.U can share unnamed cache between transformations inthe same maping. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 13, 2005 06:02:36 Sithu


#1


RE: What r the types of lookup caches?

======================================= Cache 1. Static cache 2. Dynamic cache 3. Persistent cache Sithu

======================================= Cache are three types namely Dynamic cache Static cache Persistent cache Cheers Sithu

======================================= Dynamic cache Persistence Cache Re cache Shared Cache

======================================= hi could any one get me information where you would use these caches for look ups and how do you set them.



thanks infoseeker

======================================= There are 4 types of lookup cache Persistent Recache Satic & Dynamic. Bye Stephen ======================================= Types of Caches are : 1) Dynamic Cache 2) Static Cache 3) Persistent Cache 4) Shared Cache 5) Unshared Cache ======================================= There are five types of caches such as static cache dynamic cache persistant cache shared cache etc... =======================================

33.Informatica - Difference between static cache and dynamic cache QUESTION #33

Static cache

Dynamic cache

U can not insert or update the cache

U can insert rows into the cache as u pass to the target

The informatic server returns a value from the lookup table or cache when the condition is true.When the condition is not true, informatica server returns the default value for connected transformations and null for unconnected transformations.

The informatic server inserts rows into cache when the condition is false. This indicates that the the row is not in the cache or target table. U can pass these rows to the target table

Click Here to view complete document Submitted by: vp



lets say for example your lookup table is your target table. So when you create the Lookup selecting the dynamic cache what It does is it will lookup values and if there is no match it will insert the row in both the target and the lookup cache (hence the word dynamic cache it builds up as you go along), or if there is a match it will update the row in the target. On the other hand Static caches dont get updated when you do a lookup. Above answer was rated as good by the following members: ssangi, ananthece ======================================= lets say for example your lookup table is your target table. So when you create the Lookup selecting the dynamic cache what It does is it will lookup values and if there is no match it will insert the row in both the target and the lookup cache (hence the word dynamic cache it builds up as you go along) or if there is a match it will update the row in the target. On the other hand Static caches dont get updated when you do a lookup. =======================================

34.Informatica - Which transformation should we use to normalize the COBOL and relational sources?

QUESTION #34 Normalizer Transformation. When U drag the COBOL source in to the mapping Designer workspace,the normalizer transformation automatically appears,creating input and output ports for every column in the source. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: Which transformation should we use to normalize th...



======================================= The Normalizer transformation normalizes records from COBOL and relational sources allowing you to organize the data according to your own needs. A Normalizer transformation can appear anywhere in a data flow when you normalize a relational source. Use a Normalizer transformation instead of the Source Qualifier transformation when you normalize a COBOL source. When you drag a COBOL source into the Mapping Designer workspace the Normalizer transformation automatically appears creating input and output ports for every column in the source Cheers Sithu

=======================================

35.Informatica - How the informatica server sorts the string values in Ranktransformation?

QUESTION #35 When the informatica server runs in the ASCII data movement mode it sorts session data using Binary sortorder.If U configure the seeion to use a binary sort order,the informatica server caluculates the binary value of each string and returns the specified number of rows with the higest binary values for the string. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 09, 2005 00:25:27 phani RE: How the informatica server sorts the string values...


#1


======================================= When Informatica Server runs in UNICODE data movement mode then it uses the sort order configured in session properties. =======================================

36.Informatica - What is the Rankindex in Ranktransformation?

QUESTION #36 The Designer automatically creates a RANKINDEX port for each Rank transformation. The Informatica Server uses the Rank Index port to store the ranking position for each record in a group. For example, if you create a Rank transformation that ranks the top 5 salespersons for each quarter, the rank index numbers the salespeople from 1 to 5: Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What is the Rankindex in Ranktransformation?

======================================= Based on which port you want generate Rank is known as rank port the generated values are known as rank index. Cheers Sithu

=======================================

37.Informatica - What is the Router transformation?

QUESTION #37 A Router transformation is similar to a Filter transformation because both transformations allow you to use a condition to test data. However, a Filter transformation tests data for one condition and drops the rows of data that do not meet the condition. A Router transformation tests data for one or more conditions and gives you the option to route rows of data that do not meet any of the conditions to a default output group. file:///C|/Perl/bin/result.html (45 of 363)4/1/2009 7:50:58 PM


If you need to test the same input data based on multiple conditions, use a Router Transformation in a mapping instead of creating multiple Filter transformations to perform the same task. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What is the Router transformation?

======================================= A Router transformation is similar to a Filter transformation because both transformations allow you to use a condition to test data. A Filter transformation tests data for one condition and drops the rows of data that do not meet the condition. However a Router transformation tests data for one or more conditions and gives you the option to route rows of data that do not meet any of the conditions to a default output group. Cheers Sithu

======================================= Note:- i think the definition and purpose of Router transformation define by sithusithu sithu is not clear and not fully correct as they of have mentioned sorry sithu and sithusithu but i want to clarify is that in Filter transformation also we can give so many conditions together. eg. empno 1234 and sal>25000 (2conditions)

Actual Purposes of Router Transformation are:1. Similar as filter transformation to sort the source data according to the condition applied. 2. When we want to load data into different target tables from same source but with different condition as per target tables requirement. file:///C|/Perl/bin/result.html (46 of 363)4/1/2009 7:50:58 PM


e.g. From emp table we want to load data in three(3) different target tables T1(where deptno 10) T2 (where deptno 20) and T3(where deptno 30). For this if we use filter transformation we need three(3) filter transformations So instead of using three(3) filter transformation we will use only one(1) Router transformation.

Advantages:1. Better Performance because in mapping the Router transformation Informatica server processes the input data only once instead of three as in filter transformation. 2. Less complexity because we use only one router transformation instead of multiple filter transformation.

Router Transformation is :- Active and Connected.

=======================================

38.Informatica - What r the types of groups in Router transformation? QUESTION #38 Input group Output group

The designer copies property information from the input ports of the input group to create a set of output ports for each output group. Two types of output groups User defined groups Default group U can not modify or delete default groups. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 09, 2005 00:35:44 phani RE: What r the types of groups in Router transformatio...


#1


======================================= Input group contains the data which is coming from the source.We can create as many user-defined groups as required for each condition we want to specify.Default group contains all the rows of data that doesn't satisfy the condition of any group.

======================================= A Router transformation has the following types of groups: ● ●

Input Output

Input Group The Designer copies property information from the input ports of the input group to create a set of output ports for each output group.

Output Groups There are two types of output groups: ● ●

User-defined groups Default group

You cannot modify or delete output ports or their properties. Cheers Sithu

=======================================

39.Informatica - Why we use stored procedure transformation? QUESTION #39 For populating and maintaining data bases. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. file:///C|/Perl/bin/result.html (48 of 363)4/1/2009 7:50:58 PM


#1



RE: Why we use stored procedure transformation?

======================================= A Stored Procedure transformation is an important tool for populating and maintaining databases. Database administrators create stored procedures to automate time-consuming tasks that are too complicated for standard SQL statements. Cheers Sithu

======================================= You might use stored procedures to do the following tasks: ● ● ● ●

Check the status of a target database before loading data into it. Determine if enough space exists in a database. Perform a specialized calculation. Drop and recreate indexes.

Shivaji Thaneru

======================================= You might use stored procedures to do the following tasks: ● ● ● ●

Check the status of a target database before loading data into it. Determine if enough space exists in a database. Perform a specialized calculation. Drop and recreate indexes.

Shivaji Thaneru

======================================= we use a stored procedure transformation to execute a stored procedure which in turn might do the file:///C|/Perl/bin/result.html (49 of 363)4/1/2009 7:50:58 PM


above things in a database and more. ======================================= can you give me a real time scenario please?

=======================================

40.Informatica - What is source qualifier transformation?

QUESTION #40 When U add a relational or a flat file source definition to a maping,U need to connect it to a source qualifer transformation.The source qualifier transformation represnets the records that the informatica server reads when it runs a session. Click Here to view complete document Submitted by: Rama Rao B. Source qualifier is also a table, it acts as an intermediator in between source and target metadata. And, it also generates sql, which creating mapping in between source and target metadatas. Thanks, Rama Rao Above answer was rated as good by the following members: him.life ======================================= When you add a relational or a flat file source definition to a mapping you need to connect it to a Source Qualifier transformation. The Source Qualifier represents the rows that the Informatica Server reads when it executes a session. Join data originating from the same source database. You can join two or more tables with primary-foreign key relationships by linking the sources to one Source Qualifier. ● Filter records when the Informatica Server reads source data. If you include a filter condition the Informatica Server adds a WHERE clause to the default query. ● Specify an outer join rather than the default inner join. If you include a user-defined join the Informatica Server replaces the join information specified by the metadata in the SQL query. ● Specify sorted ports. If you specify a number for sorted ports the Informatica Server adds an ORDER BY clause to the default SQL query. ● Select only distinct values from the source. If you choose Select Distinct the Informatica Server adds a SELECT DISTINCT statement to the default SQL query. ●



Create a custom query to issue a special SELECT statement for the Informatica Server to read source data. For example you might use a custom query to perform aggregate calculations or execute a stored procedure.

●

Cheers Sithu

======================================= When you add a relational or a flat file source definition to a mapping you need to connect it to a Source Qualifier transformation. The Source Qualifier represents the rows that the Informatica Server reads when it executes a session. Cheers Sithu

======================================= Source qualifier is also a table it acts as an intermediator in between source and target metadata. And it also generates sql which creating mapping in between source and target metadatas. Thanks Rama Rao ======================================= Def:- The Transformation which Converts the source(relational or flat) datatype to Informatica datatype. So it works as an intemediator between and source and informatica server. Tasks performed by qualifier transformation:1. Join data originating from the same source database. 2. Filter records when the Informatica Server reads source data. 3. Specify an outer join rather than the default inner join. 4. Specify sorted ports. 5. Select only distinct values from the source. 6. Create a custom query to issue a special SELECT statement for the Informatica Server to read source data.

======================================= file:///C|/Perl/bin/result.html (51 of 363)4/1/2009 7:50:58 PM


Source Qualifier Transformation is the beginning of the pipeline of any transformation the main purpose of this transformation is that it is reading the data from the relational or flat file and is passing the data ie. read into the mapping designed so that the data can be passed into the other transformations ======================================= Source Qualifier is a transformation with every source definiton if the source is Relational Database. Source Qualifier fires a Select statement on the source db. With every Source Definition u will get a source qualifier without Source qualifier u r mapping will be invalid and u cannot define the pipeline to the other instance. If the source is Cobol then for that source definition u will get a normalizer transormation not the Source Qualifier. =======================================

41.Informatica - What r the tasks that source qualifier performs?

QUESTION #41 Join data originating from same source data base. Filter records when the informatica server reads source data. Specify an outer join rather than the default inner join specify sorted records. Select only distinct values from the source. Creating custom query to issue a special SELECT statement for the informatica server to read source data. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What r the tasks that source qualifier performs?



======================================= ● Join data originating from the same source database. You can join two or more tables with primary-foreign key relationships by linking the sources to one Source Qualifier. ● Filter records when the Informatica Server reads source data. If you include a filter condition the Informatica Server adds a WHERE clause to the default query. ● Specify an outer join rather than the default inner join. If you include a user-defined join the Informatica Server replaces the join information specified by the metadata in the SQL query. ● Specify sorted ports. If you specify a number for sorted ports the Informatica Server adds an ORDER BY clause to the default SQL query. ● Select only distinct values from the source. If you choose Select Distinct the Informatica Server adds a SELECT DISTINCT statement to the default SQL query. ● Create a custom query to issue a special SELECT statement for the Informatica Server to read source data. For example you might use a custom query to perform aggregate calculations or execute a stored procedure. Cheers Sithu

=======================================

42.Informatica - What is the target load order?

QUESTION #42 U specify the target loadorder based on source qualifiers in a maping.If u have the multiple source qualifiers connected to the multiple targets,U can designatethe order in which informatica server loads data into the targets. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. March 01, 2006 14:27:34 saritha RE: What is the target load order?


#1


======================================= A target load order group is the collection of source qualifiers transformations and targets linked together in a mapping.

=======================================

43.Informatica - What is the default join that source qualifier provides? QUESTION #43 Inner equi join. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What is the default join that source qualifier pro...

======================================= The Joiner transformation supports the following join types which you set in the Properties tab: ● ● ● ●


Cheers Sithu

======================================= Equijoin on a key common to the sources drawn by the SQ. =======================================

44.Informatica - What r the basic needs to join two sources in a file:///C|/Perl/bin/result.html (54 of 363)4/1/2009 7:50:58 PM


source qualifier?

QUESTION #44 Two sources should have primary and Foreign key relation ships. Two sources should have matching data types. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 14, 2005 10:32:44

#1

rishi RE: What r the basic needs to join two sources in a so...

======================================= The both the table should have a common feild with same datatype. Its not neccessary both should follow primary and foreign relationship. If any relation ship exists that will help u in performance point of view.

======================================= Also of you are using a lookup in your mapping and the lookup table is small then try to join that looup in Source Qualifier to improve perf. Regards SK

======================================= Both the sources must be from same database. =======================================

45.Informatica - what is update strategy transformation ?

QUESTION #45 This transformation is used to maintain the history data or just most recent changes in to target table. file:///C|/Perl/bin/result.html (55 of 363)4/1/2009 7:50:58 PM





RE: what is update strategy transformation ?

======================================= The model you choose constitutes your update strategy how to handle changes to existing rows. In PowerCenter and PowerMart you set your update strategy at two different levels: ●

●

Within a session. When you configure a session you can instruct the Informatica Server to either treat all rows in the same way (for example treat all rows as inserts) or use instructions coded into the session mapping to flag rows for different database operations. Within a mapping. Within a mapping you use the Update Strategy transformation to flag rows for insert delete update or reject.

Chrees Sithu

======================================= Update strategy transformation is used for flagging the records for insert update delete and reject In Informatica power center u can develop update strategy at two levels use update strategy T/R in the mapping design target table options in the session the following are the target table options

Insert



Update Delete Update as Insert Update else Insert

Thanks Rekha

=======================================

46.Informatica - What is the default source option for update stratgey transformation? QUESTION #46 Data driven.

Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. March 28, 2006 05:03:53

#1

Gyaneshwar RE: What is the default source option for update strat...

======================================= DATA DRIVEN =======================================

47.Informatica - What is Datadriven?

QUESTION #47 The informatica server follows instructions coded into update strategy transformations with in the session maping determine how to flag records for insert, update, delete or reject. If u do not choose data driven option setting,the informatica server ignores all update strategy transformations in the mapping. Click Here to view complete document



No best answer available. Please pick the good answer available or submit your answer. #1



RE: What is Datadriven?

======================================= The Informatica Server follows instructions coded into Update Strategy transformations within the session mapping to determine how to flag rows for insert delete update or reject. If the mapping for the session contains an Update Strategy transformation this field is marked Data Driven by default. Cheers Sithu ======================================= When Data driven option is selected in session properties it the code will consider the update strategy (DD_UPDATE DD_INSERT DD_DELETE DD_REJECT) used in the mapping and not the options selected in the session properties.

=======================================

48.Informatica - What r the options in the target session of update strategy transsformatioin? QUESTION #48 Insert Delete Update Update as update Update as insert Update esle insert Truncate table

Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. February 03, 2006 03:46:07 Prasanna


#1


RE: What r the options in the target session of update...

======================================= Update as Insert: This option specified all the update records from source to be flagged as inserts in the target. In other words instead of updating the records in the target they are inserted as new records. Update else Insert: This option enables informatica to flag the records either for update if they are old or insert if they are new records from source.

=======================================

49.Informatica - What r the types of maping wizards that r to be provided in Informatica?

QUESTION #49 The Designer provides two mapping wizards to help you create mappings quickly and easily. Both wizards are designed to create mappings for loading and maintaining star schemas, a series of dimensions related to a central fact table. Getting Started Wizard. Creates mappings to load static fact and dimension tables, as well as slowly growing dimension tables. Slowly Changing Dimensions Wizard. Creates mappings to load slowly changing dimension tables based on the amount of historical dimension data you want to keep and the method you choose to handle historical dimension data. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What r the types of maping wizards that r to be pr...



======================================= Simple Pass through Slowly Growing Target Slowly Changing the Dimension Type1 Most recent values Type2 Full History Version Flag Date Type3 Current and one previous

======================================= Inf designer : Mapping -> wizards --> 1) Getting started -->Simple pass through mapping -->Slowly growing target 2) slowly changing dimensions---> SCD 1 (only recent values) --->SCD 2(HISTORY using flag or version or time) --->SCD 3(just recent values) one important point is dimensions are 2 types 1)slowly growing targets



2)slowly changing dimensions. =======================================

50.Informatica - What r the types of maping in Getting Started Wizard?

QUESTION #50 Simple Pass through maping : Loads a static fact or dimension table by inserting all rows. Use this mapping when you want to drop all existing data from your table before loading new data. Slowly Growing target : Loads a slowly growing fact or dimension table by inserting new rows. Use this mapping to load new data when existing data does not require updates. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What r the types of maping in Getting Started Wiza...

======================================= 1. Simple Pass through2. Slowly Growing TargetCheers Sithu =======================================

51.Informatica - What r the mapings that we use for slowly changing dimension table?

QUESTION #51 Type1: Rows containing changes to existing dimensions are updated in the target by overwriting the existing dimension. In the Type 1 Dimension mapping, all rows contain current dimension data. Use the Type 1 Dimension mapping to update a slowly changing dimension table when you do not need to keep any previous versions of dimensions in the table. Type 2: The Type 2 Dimension Data mapping inserts both new and changed dimensions into the target. Changes are tracked in the target table by versioning the primary key and creating a version number for each dimension in the table. Use the Type 2 Dimension/Version Data mapping to update a slowly changing file:///C|/Perl/bin/result.html (61 of 363)4/1/2009 7:50:58 PM


dimension table when you want to keep a full history of dimension data in the table. Version numbers and versioned primary keys track the order of changes to each dimension. Type 3: The Type 3 Dimension mapping filters source rows based on user-defined comparisons and inserts only those found to be new dimensions to the target. Rows containing changes to existing dimensions are updated in the target. When updating an existing dimension, the Informatica Server saves existing data in different columns of the same row and replaces the existing data with the updates Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. June 03, 2006 09:39:20 mamatha RE: What r the mapings that we use for slowly changing...

======================================= hello sir i want whole information on slowly changing dimension.and also want project on slowly changing dimension in informatica. Thanking you sir mamatha.

======================================= 1.Up Date strategy Transfermation 2.Look up Transfermation.


#1


Type1: Rows containing changes to existing dimensions are updated in the target by overwriting the existing dimension. In the Type 1 Dimension mapping all rows contain current dimension data. Use the Type 1 Dimension mapping to update a slowly changing dimension table when you do not need to keep any previous versions of dimensions in the table. Type 2: The Type 2 Dimension Data mapping inserts both new and changed dimensions into the target. Changes are tracked in the target table by versioning the primary key and creating a version number for each dimension in the table. Use the Type 2 Dimension/Version Data mapping to update a slowly changing dimension table when you want to keep a full history of dimension data in the table. Version numbers and versioned primary keys track the order of changes to each dimension. Type 3: The Type 3 Dimension mapping filters source rows based on user-defined comparisons and inserts only those found to be new dimensions to the target. Rows containing changes to existing dimensions are updated in the target. ======================================= SCD: Source to SQ - 1 mapping SQ to LKP - 2 mapping SQ_LKP to EXP - 3 Mapping EXP to FTR - 4 Mapping FTR to UPD - 5 Mapping UPD to TGT - 6 Mapping SQGen to TGT - 7 Mapping. I think these are the 7 mapping used for SCD in general; For type 1: The mapping will be doubled that is one for insert and other for update and total as 14. For type 2 : The mapping will be increased thrice one for insert 2nd for update and 3 to keep the old one. (here the history stores) For type three : It will be doubled for insert one row and also to insert one column to keep the previous data. Cheers Prasath =======================================

52.Informatica - What r the different types of Type2 dimension maping? QUESTION #52 Type2 Dimension/Version Data Maping: In this maping the updated dimension in the source will gets inserted in target along with a new version number.And newly added dimension file:///C|/Perl/bin/result.html (63 of 363)4/1/2009 7:50:58 PM


in source will inserted into target with a primary key. Type2 Dimension/Flag current Maping: This maping is also used for slowly changing dimensions.In addition it creates a flag value for changed or new dimension. Flag indiactes the dimension is new or newlyupdated.Recent dimensions will gets saved with cuurent flag value 1. And updated dimensions r saved with the value 0. Type2 Dimension/Effective Date Range Maping: This is also one flavour of Type2 maping used for slowly changing dimensions.This maping also inserts both new and changed dimensions in to the target.And changes r tracked by the effective date range for each version of each dimension. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What r the different types of Type2 dimension mapi...

======================================= Type2 1. Version number 2. Flag 3.Date Cheers Sithu



53.Informatica - How can u recognise whether or not the newly added rows in the source r gets insert in the target ? QUESTION #53 In the Type2 maping we have three options to recognise the newly added rows Version number Flagvalue Effective date Range Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 14, 2005 10:43:31

#1

rishi RE: How can u recognise whether or not the newly added...

======================================= If it is Type 2 Dimension the abouve answer is fine but if u want to get the info of all the insert statements and Updates you need to use session log file where you configure it to verbose. You will get complete set of data which record was inserted and which was not.

======================================= Just use debugger to know how the data from source moves to target it will show how many new rows get inserted else updated. =======================================

54.Informatica - What r two types of processes that informatica runs the session? QUESTION #54 Load manager Process: Starts the session, creates the DTM process, and sends post-session email when the session completes. The DTM process. Creates threads to initialize the session, read, write, and transform data, and handle pre- and post-session operations. Click Here to view complete document




September 17, 2007 08:17:02 rasmi

Member Since: June 2007 Contribution: 20

RE: What r two types of processes that informatica run...

======================================= When the workflow start to run Then the informatica server process starts Two process:load manager process and DTM Process; The load manager process has the following tasks 1. lock the workflow and read the properties of workflow 2.create workflow log file 3. start the all tasks in workfolw except session and worklet 4.It starts the DTM Process. 5.It will send the post session Email when the DTM abnormally terminated The DTM process involved in the following tasks 1. read session properties 2.create session log file 3.create Threades such as master thread read write transformation threateds 4.send post session Email. 5.run the pre and post shell commands . 6.run the pre and post stored procedures. =======================================

55.Informatica - Can u generate reports in Informatcia?

QUESTION #55 Yes. By using Metadata reporter we can generate reports in informatica. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1





RE: Can u generate reports in Informatcia?

======================================= It is a ETL tool you could not make reports from here but you can generate metadata report that is not going to be used for business analysis Cheers Sithu

======================================= can u pls tell me how generate metadata reports? =======================================

56.Informatica - Define maping and sessions?

QUESTION #56 Maping: It is a set of source and target definitions linked by transformation objects that define the rules for transformation. Session : It is a set of instructions that describe how and when to move data from source to targets. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 04, 2006 15:07:09 Pavani RE: Define maping and sessions?


#1


======================================= Mapping: A set of source and target definitions linked by diffrent transformation that define the rules for data transformation. Session: A session identifies the mapping created with in the mapping designer. and Identification of the mapping by the informatica server is done with the help of session. -Pavani.

=======================================

57.Informatica - Which tool U use to create and manage sessions and batches and to monitor and stop the informatica s QUESTION #57 Informatica server manager. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. May 16, 2006 12:55:46 Leninformatica RE: Which tool U use to create and manage sessions and...


#1


======================================= Informatica Workflow Managar and Informatica Worlflow Monitor =======================================

58.Informatica - Why we use partitioning the session in informatica?

QUESTION #58 Partitioning achieves the session performance by reducing the time period of reading the source and loading the data into target. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

September 30, 2005 00:26:04 khadarbasha

Member Since: September 2005 Contribution: 2

RE: Why we use partitioning the session in informatica...

======================================= Performance can be improved by processing data in parallel in a single session by creating multiple partitions of the pipeline. Informatica server can achieve high performance by partitioning the pipleline and performing the extract transformation and load for each partition in parallel.

=======================================

59.Informatica - How the informatica server increases the session performance through partitioning the source?

QUESTION #59 For a relational sources informatica server creates multiple connections for each parttion of a single source and extracts seperate range of data for each connection.Informatica server reads multiple partitions of a single source concurently.Similarly for loading also informatica server creates multiple connections to the target and loads partitions of data concurently. For XML and file sources,informatica server reads multiple files concurently.For loading the data informatica server creates a seperate file for each partition(of a file:///C|/Perl/bin/result.html (69 of 363)4/1/2009 7:50:58 PM


source file).U can choose to merge the targets. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. February 13, 2006 08:00:53

#1

durga RE: How the informatica server increases the session p...

======================================= fine explanation =======================================

60.Informatica - What r the tasks that Loadmanger process will do?

QUESTION #60 Manages the session and batch scheduling: Whe u start the informatica server the load maneger launches and queries the repository for a list of sessions configured to run on the informatica server.When u configure the session the loadmanager maintains list of list of sessions and session start times. When u sart a session loadmanger fetches the session information from the repository to perform the validations and verifications prior to starting DTM process. Locking and reading the session: When the informatica server starts a session lodamaager locks the session from the repository.Locking prevents U starting the session again and again. Reading the parameter file: If the session uses a parameter files,loadmanager reads the parameter file and verifies that the session level parematers are declared in the file Verifies permission and privelleges: When the sesson starts load manger checks whether or not the user have privelleges to run the session. Creating log files: Loadmanger creates logfile contains the status of session. Click Here to view complete document



No best answer available. Please pick the good answer available or submit your answer. August 17, 2005 02:08:34

#1

AnjiReddy RE: What r the tasks that Loadmanger process will do?

======================================= How can you determine whether informatica server is running or not with out using event viewer by using shell command. I would appreciate the solution for this one. Feel free to mail me at puli. [email protected] =======================================

61.Informatica - What r the different threads in DTM process? QUESTION #61 Master thread: Creates and manages all other threads

Maping thread: One maping thread will be creates for each session.Fectchs session and maping information. Pre and post session threads: This will be created to perform pre and post session operations. Reader thread: One thread will be created for each partition of a source.It reads data from source. Writer thread: It will be created to load data to the target. Transformation thread: It will be created to tranform data. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. October 12, 2006 00:56:46 Killer RE: What r the different threads in DTM process?


#1


======================================= Yupz this make sense ! ) =======================================

62.Informatica - Can u copy the session to a different folder or repository? QUESTION #62 Yes. By using copy session wizard u can copy a session in a different folder or repository.But that target folder or repository should consists of mapping of that session. If target folder or repository is not having the maping of copying session , u should have to copy that maping first before u copy the session Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. February 03, 2006 03:56:14

#1

Prasanna RE: Can u copy the session to a different folder or re...

======================================= In addition you can copy the workflow from the Repository manager. This will automatically copy the mapping associated source targets and session to the target folder. =======================================

63.Informatica - What is batch and describe about types of batches?

QUESTION #63 Grouping of session is known as batch.Batches r two types Sequential: Runs sessions one after the other Concurrent: Runs session at same time. If u have sessions with source-target dependencies u have to go for sequential batch to start the sessions one after another.If u have several independent sessions u can use concurrent batches. Whch runs all the sessions at the same time. Click Here to view complete document




February 15, 2006 13:13:03 sangroover RE: What is batch and describe about types of batches?...

======================================= Batch--- is a group of any thing Different batches ----Different groups of different things.

=======================================

64.Informatica - Can u copy the batches? QUESTION #64 NO


December 16, 2007 14:26:30 dl_mstr

Member Since: November 2007 Contribution: 26

RE: Can u copy the batches?

======================================= Yes I think workflows can be copied from one folder/repository to another ======================================= It should be definitely yes. Without that : 1.the migration of the workflows from dev to test and to Production would not make any sense 2. For the similar logics we have to do same cumbersome job There might be some limitations while copying the batches like we might not be able to copy the overwritten properties of the workflow. ======================================= there is a slight correction in the above answer.



We might not be able to copy the overriden (wrote overwritten in above answer) properties =======================================

65.Informatica - When the informatica server marks that a batch is failed?

QUESTION #65 If one of session is configured to "run if previous completes" and that previous session fails. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

April 01, 2008 06:05:46 Vani_AT


RE: When the informatica server marks that a batch is failed?

======================================= A batch fails when the sessions in the workflow are checked with the property "Fail if parent fails" and any of the session in the sequential batch fails. =======================================

66.Informatica - What r the different options used to configure the sequential batches? QUESTION #66 Two options

Run the session only if previous session completes sucessfully. Always runs the session. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

August 16, 2007 13:17:03 rasmi


RE: What r the different options used to configure the...



======================================= Hi Where we have to specify these options. ======================================= You have to specify those options in the workflow designer. You can double click the pipeline which connects two sessions and there you can define prevtaskstatus succeeded. Then only the next session runs. You can also go edit the session and check 'fail parent if this task fails' which means it will mark the workflow as failed. If the workflow is failed it won't run the remaining sessions.

======================================= I would like to make a small correction for the above answer. Even if a session fails with the above property set all the following sessions of the workflow still run and succeed depending on the validity/correctness of the individual sessions. The only difference this property makes is it marks the workflow as failed. =======================================

67.Informatica - In a sequential batch can u run the session if previous session fails? QUESTION #67 Yes.By setting the option always runs the session. Click Here to view complete document


June 26, 2008 01:03:25 prade

Member Since: May 2008 Contribution: 6

RE: In a sequential batch can u run the session if previous session fails?



======================================= Yes you can. Start ---L1-------> S1 --------L2-------> S2 suppose S1 fails and we still want to run S2 then L2 condition --> $S1.status FAILED or $S1.status SUCCEEDED =======================================

68.Informatica - Can u start a batches with in a batch?

QUESTION #68 U can not. If u want to start batch that resides in a batch,create a new independent batch and copy the necessary sessions into the new batch. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. February 15, 2006 13:13:47

#1

sangroover RE: Can u start a batches with in a batch?

======================================= Logically Yes ======================================= Logically Yes we can craete worklets and call the batch ======================================= Logically yes. I have not worked with worklets. But as we can start a single session within a workflow; similarly we should be able to start a worklet within a workflow. =======================================

69.Informatica - Can u start a session inside a batch idividually? QUESTION #69 We can start our required session only in case of sequential batch.in case of concurrent batch we cant do like this. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer.



#1

April 01, 2008 06:28:12 Vani_AT


RE: Can u start a session inside a batch idividually?

======================================= Yes we can do this in any case. Sequential or concurrent doesn't matter. Ther is no absolute concurrent workflow. Every workflow starts with a "start" task and hence the workflow is a hybrid. ======================================= Yes we can do =======================================

70.Informatica - How can u stop a batch?

QUESTION #70 By using server manager or pmcmd. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. May 28, 2007 04:38:06

#1

VEMBURAJ.P RE: How can u stop a batch?

======================================= by using menu command or pmcmd. ======================================= In workflow monitor 1. click on the workflow name 2. click on stop =======================================

71.Informatica - What r the session parameters?

QUESTION #71 Session parameters r like maping parameters,represent values U might want to change between sessions such as database connections or source files. Server manager also allows U to create userdefined session parameters. file:///C|/Perl/bin/result.html (77 of 363)4/1/2009 7:50:58 PM


Following r user defined session parameters. Database connections Source file names: use this parameter when u want to change the name or location of session source file between session runs Target file name : Use this parameter when u want to change the name or location of session target file between session runs. Reject file name : Use this parameter when u want to change the name or location of session reject files between session runs. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

April 01, 2008 06:40:17 Vani_AT


RE: What r the session parameters?

======================================= In addition to this we provide the lookup file name. The values for these variables are provided in the parameter file and the parameters start with a $$ (double dollar symbol). There is a predefined format for specifying session parameter. For eg. If we want to use a parameter for source file then it must be prefixed with $$SrcFile_. ======================================= a small correction it starts with single dollar symbol . double dollar symbol is used for mapping parameters. =======================================

72.Informatica - What is parameter file?

QUESTION #72 Parameter file is to define the values for parameters and variables used in a session.A parameter file is a file created by text editor such as word pad or notepad. U can define the following values in parameter file Maping parameters Maping variables file:///C|/Perl/bin/result.html (78 of 363)4/1/2009 7:50:58 PM


session parameters Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: What is parameter file?

======================================= When you start a workflow you can optionally enter the directory and name of a parameter file. The Informatica Server runs the workflow using the parameters in the file you specify. For UNIX shell users enclose the parameter file name in single quotes: -paramfile '$PMRootDir/myfile.txt' For Windows command prompt users the parameter file name cannot have beginning or trailing spaces. If the name includes spaces enclose the file name in double quotes: -paramfile $PMRootDir\my file.txt Note: When you write a pmcmd command that includes a parameter file located on another machine use the backslash (\) with the dollar sign ($). This ensures that the machine where the variable is defined expands the server variable. pmcmd startworkflow -uv USERNAME -pv PASSWORD -s SALES:6258 -f east -w wSalesAvg paramfile '\$PMRootDir/myfile.txt' Cheers Sithu

=======================================

73.Informatica - What is difference between partioning of relatonal target and partitioning of file targets? file:///C|/Perl/bin/result.html (79 of 363)4/1/2009 7:50:58 PM


QUESTION #73 If u parttion a session with a relational target informatica server creates multiple connections to the target database to write target data concurently.If u partition a session with a file target the informatica server creates one target file for each partition.U can configure session properties to merge these target files. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. June 13, 2006 19:10:59 UmaBojja RE: What is difference between partioning of relatonal...

======================================= Partition's can be done on both relational and flat files. Informatica supports following partitions 1.Database partitioning 2.RoundRobin 3.Pass-through 4.Hash-Key partitioning 5.Key Range partitioning All these are applicable for relational targets.For flat file only database partitioning is not applicable. Informatica supports Nway partitioning.U can just specify the name of the target file and create the partitions rest will be taken care by informatica session.


#1


======================================= Could you please tell me how can we partition the session and target?

=======================================

74.Informatica - Performance tuning in Informatica?

QUESTION #74 The goal of performance tuning is optimize session performance so sessions run during the available load window for the Informatica Server. Increase the session performance by following. The performance of the Informatica Server is related to network connections. Data generally moves across a network at less than 1 MB per second, whereas a local disk moves data five to twenty times faster. Thus network connections ofteny affect on session performance.So aviod netwrok connections. Flat files: If u’r flat files stored on a machine other than the informatca server, move those files to the machine that consists of informatica server. Relational datasources: Minimize the connections to sources ,targets and informatica server to improve session performance.Moving target database into server system may improve session performance. Staging areas: If u use staging areas u force informatica server to perform multiple datapasses. Removing of staging areas may improve session performance. U can run the multiple informatica servers againist the same repository. Distibuting the session load to multiple informatica servers may improve session performance. Run the informatica server in ASCII datamovement mode improves the session performance.Because ASCII datamovement mode stores a character value in one byte.Unicode mode takes 2 bytes to store a character. If a session joins multiple source tables in one Source Qualifier, optimizing the query may improve performance. Also, single table select statements with an ORDER BY or GROUP BY clause may benefit from optimization such as adding indexes. file:///C|/Perl/bin/result.html (81 of 363)4/1/2009 7:50:58 PM


We can improve the session performance by configuring the network packet size, which allows data to cross the network at one time.To do this go to server manger ,choose server configure database connections. If u r target consists key constraints and indexes u slow the loading of data.To improve the session performance in this case drop constraints and indexes before u run the session and rebuild them after completion of session. Running a parallel sessions by using concurrent batches will also reduce the time of loading the data.So concurent batches may also increase the session performance. Partittionig the session improves the session performance by creating multiple connections to sources and targets and loads data in paralel pipe lines. In some cases if a session contains a aggregator transformation ,u can use incremental aggregation to improve session performance. Aviod transformation errors to improve the session performance. If the sessioin containd lookup transformation u can improve the session performance by enabling the look up cache. If U’r session contains filter transformation ,create that filter transformation nearer to the sources or u can use filter condition in source qualifier. Aggreagator,Rank and joiner transformation may oftenly decrease the session performance .Because they must group data before processing it.To improve session performance in this case use sorted ports option. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

January 05, 2007 10:20:40 Infoseek




RE: Performance tuning in Informatica?

======================================= thanks for your above answer hey would like to know how we can partition a big datafile(flat) around 1Gig..and what are the options to set for the same. in Power centre V7.X

======================================= Hey Thank You so much for the information. That was one of the best answers I have read on this website. Descriptive yet to the point and highly useful in real world. I appreciate your effort. =======================================

75.Informatica - What is difference between maplet and reusable transformation? QUESTION #75 Maplet consists of set of transformations that is reusable.A reusable transformation is a single transformation that can be reusable.

If u create a variables or parameters in maplet that can not be used in another maping or maplet.Unlike the variables that r created in a reusable transformation can be usefull in any other maping or maplet. We can not include source definitions in reusable transformations.But we can add sources to a maplet. Whole transformation logic will be hided in case of maplet.But it is transparent in case of reusable transformation. We cant use COBOL source qualifier,joiner,normalizer transformations in maplet.Where as we can make them as a reusable transformations. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1





RE: What is difference between maplet and reusable tra...

======================================= Maplet: one or more transformations Reusable transformation: only one transformation Cheers Sithu

======================================= Mapplet is a group of reusable transformation.The main purpose of using Mapplet is to hide the logic from end user point of view...It works like a function in C language.We can use it N number of times.Its a reusable object. Reusable transformation is a single transformation. =======================================

76.Informatica - Define informatica repository?

QUESTION #76 The Informatica repository is a relational database that stores information, or metadata, used by the Informatica Server and Client tools. Metadata can include information such as mappings describing how to transform source data, sessions indicating when you want the Informatica Server to perform the transformations, and connect strings for sources and targets. The repository also stores administrative information such as usernames and passwords, permissions and privileges, and product version. Use repository manager to create the repository.The Repository Manager connects to the repository database and runs the code needed to create the repository tables.Thsea tables stores metadata in specific format the informatica server,client tools use. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer.



#1



RE: Define informatica repository?

======================================= Infromatica Repository:The informatica repository is at the center of the informatica suite. You create a set of metadata tables within the repository database that the informatica application and tools access. The informatica client and server access the repository to save and retrieve metadata. Cheers Sithu

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77.Informatica - What r the types of metadata that stores in repository? QUESTION #77 Following r the types of metadata that stores in the repository Database connections Global objects Mappings Mapplets Multidimensional metadata Reusable transformations Sessions and batches Short cuts Source definitions Target defintions Transformations Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer.



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RE: What r the types of metadata that stores in reposi...

======================================= ● Source definitions. Definitions of database objects (tables views synonyms) or files that provide source data. ● Target definitions. Definitions of database objects or files that contain the target data. ● Multi-dimensional metadata. Target definitions that are configured as cubes and dimensions. ● Mappings. A set of source and target definitions along with transformations containing business logic that you build into the transformation. These are the instructions that the Informatica Server uses to transform and move data. ● Reusable transformations. Transformations that you can use in multiple mappings. ● Mapplets. A set of transformations that you can use in multiple mappings. ● Sessions and workflows. Sessions and workflows store information about how and when the Informatica Server moves data. A workflow is a set of instructions that describes how and when to run tasks related to extracting transforming and loading data. A session is a type of task that you can put in a workflow. Each session corresponds to a single mapping. Cheers Sithu

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78.Informatica - What is power center repository?

QUESTION #78 The PowerCenter repository allows you to share metadata across repositories to create a data mart domain. In a data mart domain, you can create a single global repository to store metadata used across an enterprise, and a number of local repositories to share the global metadata as needed. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1





RE: What is power center repository?

======================================= ● Standalone repository. A repository that functions individually unrelated and unconnected to other repositories. ● Global repository. (PowerCenter only.) The centralized repository in a domain a group of connected repositories. Each domain can contain one global repository. The global repository can contain common objects to be shared throughout the domain through global shortcuts. ● Local repository. (PowerCenter only.) A repository within a domain that is not the global repository. Each local repository in the domain can connect to the global repository and use objects in its shared folders. Cheers Sithu

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79.Informatica - How can u work with remote database in informatica?did u work directly by using remote connections?

QUESTION #79 To work with remote datasource u need to connect it with remote connections.But it is not preferable to work with that remote source directly by using remote connections . Instead u bring that source into U r local machine where informatica server resides.If u work directly with remote source the session performance will decreases by passing less amount of data across the network in a particular time. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1



RE: How can u work with remote database in informatica...



======================================= You can work with remote But you have to Configure FTP Connection details IP address User authentication Cheers Sithu

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80.Informatica - What is tracing level and what r the types of tracing level? QUESTION #80 Tracing level represents the amount of information that informatcia server writes in a log file. Types of tracing level Normal Verbose Verbose init Verbose data Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. April 16, 2007 03:19:08 Minnu RE: What is tracing level and what r the types of trac...


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======================================= Its 1) Terse 2) Normal 3) Verbose Init 4) Verbose data =======================================

81.Informatica - If a session fails after loading of 10,000 records in to the target.How can u load the records from QUESTION #81 As explained above informatcia server has 3 methods to recovering the sessions.Use performing recovery to load the records from where the session fails. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

April 08, 2007 11:17:03 ggk.krishna

Member Since: February 2007 Contribution: 12

RE: If a session fails after loading of 10,000 records...

======================================= Hi We can restart the session using session recovery option in workflow manager and workflow monitor. Then the loading starts from 10001 th row. If you start the session normally it starts from 1 st row. If you define target load type as "Bulk" session recovery is not possible. =======================================

82.Informatica - If i done any modifications for my table in back end does it reflect in informatca warehouse or mapi

QUESTION #82 NO. Informatica is not at all concern with back end data base.It displays u all the information that is to be stored in repository.If want to reflect back end changes to informatica screens, file:///C|/Perl/bin/result.html (89 of 363)4/1/2009 7:50:58 PM


again u have to import from back end to informatica by valid connection.And u have to replace the existing files with imported files. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. August 04, 2006 05:35:19

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vidyanand RE: If i done any modifications for my table in back e...

======================================= Yes It will be reflected once u refresh the mapping once again. ======================================= It does matter if you have SQL override - say in the SQ or in a Lookup you override the default sql. Then if you make a change to the underlying table in the database that makes the override SQL incorrect for the modified table the session will fail. If you change a table - say rename a column that is in the sql override statement then session will fail. But if you added a column to the underlying table after the last column then the sql statement in the override will still be valid. If you make change to the size of columns the sql will still be valid although you may get truncation of data if the database column has larger size (more characters) than the SQ or subsequent transformation.

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83.Informatica - After draging the ports of three sources(sql server, oracle,informix) to a single source qualifier, c QUESTION #83 NO.Unless and until u join those three ports in source qualifier u cannot map them directly. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. December 14, 2005 10:37:10 rishi


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RE: After draging the ports of three sources(sql serve...

======================================= if u drag three hetrogenous sources and populated to target without any join means you are entertaining Carteisn product. If you don't use join means not only diffrent sources but homegeous sources are show same error. If you are not interested to use joins at source qualifier level u can add some joins sepratly.

======================================= Yes it possible... ======================================= I don't think dragging three heterogeneous sources in a single source qualifier is valid. Whenever we drag multiple sources in same source qualifier 1. There must be a joining key between the tables. 2. The SQL needs to be executed in the database to join the three tables. To use a single source qualifier for multiple sources the data source for all the sources should be same. For Heterogeneous join a Joiner transformation has to be used. The first part of the question itself is not possible. ======================================= Sources from heterogenous databases cannot be pulled into a single source qualifier. They can only be joined using a joiner. And then can be written to the target =======================================

84.Informatica - What is Data cleansing..?

QUESTION #84 The process of finding and removing or correcting data that is incorrect, out-of-date, redundant, incomplete, or formatted incorrectly. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. April 27, 2005 11:12:05 neetha RE: What is Data cleansing..?


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======================================= Data cleansing is a two step process including DETECTION and then CORRECTION of errors in a data set. ======================================= This is nothing but polising of data. For example of one of the sub system store the Gender as M and F. The other may store it as MALE and FEMALE. So we need to polish this data clean it before it is add to Datawarehouse. Other typical example can be Addresses. The all sub systesms maintinns the customer address can be different. We might need a address cleansing to tool to have the customers addresses in clean and neat form. ======================================= Data cleansing means remove the inconistance data and transfer the data correct way and correct manner ======================================= it means process of removing data inconsistancies and reducing data in accuracies.

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85.Informatica - how can we partition a session in Informatica?

QUESTION #85 No best answer available. Please pick the good answer available or submit your answer. July 08, 2005 18:12:42 Kevin B RE: how can we partition a session in Informatica?


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Click Here to view complete document The Informatica PowerCenter Partitioning option optimizes parallel processing on multiprocessor hardware by providing a thread-based architecture and built-in data partitioning. GUI-based tools reduce the development effort necessary to create data partitions and streamline ongoing troubleshooting and performance tuning tasks while ensuring data integrity throughout the execution process. As the amount of data within an organization expands and real-time demand for information grows the PowerCenter Partitioning option enables hardware and applications to provide outstanding performance and jointly scale to handle large volumes of data and users. ======================================= Download the Document =======================================

86.Informatica - what is a time dimension? give an example.

QUESTION #86 No best answer available. Please pick the good answer available or submit your answer. August 04, 2005 07:48:36

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Sakthi RE: what is a time dimension? give an example. Click Here to view complete document Time dimension is one of important in Datawarehouse. Whenever u genetated the report that time u access all data from thro time dimension. eg. employee time dimension Fields : Date key full date day of wek day month quarter fiscal year ======================================= In a relational data model for normalization purposes year lookup quarter lookup month lookup and week lookups are not merged as a single table. In a dimensional data modeling(star schema) these tables would be merged as a single table called TIME DIMENSION for performance and slicing data. This dimensions helps to find the sales done on date weekly monthly and yearly basis. We can have a trend analysis by comparing this year sales with the previous year or this week sales with the previous week. ======================================= A TIME DIMENSION is a table that contains the detail information of the time at which a particular file:///C|/Perl/bin/result.html (93 of 363)4/1/2009 7:50:58 PM


'transaction' or 'sale' (event) has taken place. The TIME DIMENSION has the details of DAY WEEK MONTH QUARTER YEAR

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87.Informatica - Diff between informatica repositry server & informatica server

QUESTION #87 No best answer available. Please pick the good answer available or submit your answer. #1

August 11, 2005 02:05:13 Nagi R Anumandla RE: Diff between informatica repositry server & informatica server Click Here to view complete document Informatica Repository Server:It's manages connections to the repository from client application. Informatica Server:It's extracts the source data performs the data transformation and loads the transformed data into the target =======================================

88.Informatica - Explain the informatica Architecture in detail


January 13, 2006 07:47:31 chiranth


RE: Explain the informatica Architecture in detail...



Click Here to view complete document informatica server connects source data and target data using native odbc drivers again it connect to the repository for running sessions and retriveing metadata information source------>informatica server--------->target | | REPOSITORY

======================================= repository←Repository→Repository ser.adm. control server ↕ source←informatica server→target ------------↕↕↕ designer w.f.manager w.f.monitor

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89.Informatica - Discuss the advantages & Disadvantages of star & snowflake schema?

QUESTION #89 No best answer available. Please pick the good answer available or submit your



answer. August 25, 2005 02:24:19

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prasad nallapati RE: Discuss the advantages & Disadvantages of star & snowflake schema? Click Here to view complete document In a star schema every dimension will have a primary key. In a star schema a dimension table will not have any parent table. Whereas in a snow flake schema a dimension table will have one or more parent tables. Hierarchies for the dimensions are stored in the dimensional table itself in star schema. Whereas hierachies are broken into separate tables in snow flake schema. These hierachies helps to drill down the data from topmost hierachies to the lowermost hierarchies. ======================================= In a STAR schema there is no relation between any two dimension tables whereas in a SNOWFLAKE schema there is a possible relation between the dimension tables.

======================================= star schema consists of single fact table surrounded by some dimensional table.In snowflake schema the dimension tables are connected with some subdimension table. In starflake dimensional ables r denormalized in snowflake dimension tables r normalized. star schema is used for report generation snowflake schema is used for cube. The advantage of snowflake schema is that the normalized tables r easier to maintain.it also saves the storage space. The disadvantage of snowflake schema is that it reduces the effectiveness of navigation across the tables due to large no of joins between them.

======================================= It depends upon the clients which they are following whether snowflake or star schema.



======================================= Snowflakes are an addition to the Kimball Dimensional system to enable that system to handle hierarchial data. When Kimball proposed the dimensional data warehouse it was not first recogonized that hierarchial data could not be stored. Commonly every attempt is made not to use snowflakes by flattening hierarchies but when either this is not possible or practical the snowflake design solves the problem. Snowflake tables are ofter called "outlyers" by data modelers because they must share a key with a diminsion that directly connects to a fact table. SD2 can have "outlyers" but these are very difficult to instantiate. =======================================

90.Informatica - Waht are main advantages and purposeof usingNormalizer Transformation in Informatica?


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prasad nallapati RE: Waht are main advantages and purpose of using Normalizer Transformation in Informatica? Click Here to view complete document Narmalizer Transformation is used mainly with COBOL sources where most of the time data is stored in de-normalized format. Also Normalizer transformation can be used to create multiple rows from a single row of data ======================================= hi By using Normalizer transformation we can conver rows into columns and columns into rows and also we can collect multile rows from one row ======================================= vamshidhar How do u convert rows to columns in Normalizer? could you explain us?? Normally its used to convert columns to rows but for converting rows to columns we need an aggregator and expression and little effort is needed for coding. Denormalization is not possible with a Normalizer transformation. file:///C|/Perl/bin/result.html (97 of 363)4/1/2009 7:50:58 PM


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91.Informatica - How to read rejected data or bad data from bad file and reload it to target?

QUESTION #91 No best answer available. Please pick the good answer available or submit your answer. October 04, 2005 23:16:28

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ravi kumar guturi RE: How to read rejected data or bad data from bad fil... Click Here to view complete document correction the rejected data and send to target relational tables using loadorder utility. Find out the rejected data by using column indicatior and row indicator.

======================================= Design a trap to a file or table by the use of a filter transformation or a router transformation. Router works well for this. =======================================

92.Informatica - How do youtransfert the data from data warehouse to flatfile?

QUESTION #92 No best answer available. Please pick the good answer available or submit your answer. November 09, 2005 17:02:07 paul luthra RE: How do you transfert the data from data wareh...


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Click Here to view complete document You can write a mapping with the flat file as a target using a DUMMY_CONNECTION. A flat file target is built by pulling a source into target space using Warehouse Designer tool. =======================================

93.Informatica - At the max how many tranformations can be us in a mapping?

QUESTION #93 No best answer available. Please pick the good answer available or submit your answer. September 27, 2005 12:32:26

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sangeetha RE: At the max how many tranformations can be us in a ... Click Here to view complete document n number of transformations ======================================= 22 transformation expression joiner aggregator router stored procedure etc. You can find on Informatica transformation tool bar.

======================================= In a mapping we can use any number of transformations depending on the project and the included transformations in the perticular related transformatons. ======================================= There is no such limitation to use this number of transformations. But in performance point of view using too many transformations will reduce the session performance. My idea is if needed more tranformations to use in a mapping its better to go for some stored procedure.

======================================= Always remember when designing a mapping: less for more design with the least number of transformations that can do the most jobs.



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94.Informatica - What is the difference between Narmal load and Bulk load?


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suresh RE: What is the difference between Narmal load and Bulk load? Click Here to view complete document what is the difference between powermart and power center? ======================================= when we go for unconnected lookup transformation? ======================================= bulk load is faster than normal load. In case of bulk load informatica server by passes the data base log file so we can not roll bac the transactions. Bulk load is also called direct loading.

======================================= Normal Load: Normal load will write information to the database log file so that if any recorvery is needed it is will be helpful. when the source file is a text file and loading data to a table in such cases we should you normal load only else the session will be failed. Bulk Mode: Bulk load will not write information to the database log file so that if any recorvery is needed we can't do any thing in such cases. compartivly Bulk load is pretty faster than normal load.

======================================= Rule of thumb For small number of rows use Normal load



For volume of data use bulk load

======================================= also remember that not all databases support bulk loading. and bulk loading fails a session if your mapping has primary keys =======================================

95.Informatica - what is a junk dimension


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prasad Nallapati RE: what is a junk dimension Click Here to view complete document A junk dimension is a collection of random transactional codes flags and/or text attributes that are unrelated to any particular dimension. The junk dimension is simply a structure that provides a convenient place to store the junk attributes. A good example would be a trade fact in a company that brokers equity trades. ======================================= A junk dimension is a used for constrain queary purpose based on text and flag values. Some times a few dimensions discarded in a major dimensions That time we kept in to one place the all discarded dimensions that is called junk dimensions.

======================================= Junk dimensions are particularly useful in Snowflake schema and one of the reasons why snowfalke is preferred over the star schema. There are dimensions that are frequently updated. So from the base set of the dimensions that are already existing we pull out the dimensions that are frequently updated and put them into a separate table. This dimension table is called the junk dimension. =======================================

96.Informatica - can we lookup a table from a source qualifer file:///C|/Perl/bin/result.html (101 of 363)4/1/2009 7:50:58 PM


transformation-unconnected lookup


November 22, 2005 01:29:07 nandam


RE: can we lookup a table from a source qualifer trans... Click Here to view complete document no we cant lookup data ======================================= No. we can't do. I will explain you why. 1) Unless you assign the output of the source qualifier to another transformation or to target no way it will include the feild in the query. 2) source qualifier don't have any variables feilds to utalize as expression.

======================================= No it's not possible. source qualifier don't have any variables fields to utilize as expression. =======================================

97.Informatica - how to get the first 100 rows from the flat file into the target?

QUESTION #97 No best answer available. Please pick the good answer available or submit your answer. October 04, 2005 01:07:33 ravi RE: how to get the first 100 rows from the flat file i...


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Click Here to view complete document by usning shell script

======================================= please check this one task ----->(link) session (workflow manager) double click on link and type $$source sucsess rows(parameter in session variables) 100 it should automatically stops session.

======================================= I'd copy first 100 records to new file and load. Just add this Unix command in session properties --> Components --> Pre-session Command head -100 > Mention new file name and path in the Session --> Source properties. ======================================= 1. Use test download option if you want to use it for testing. 2. Put counter/sequence generator in mapping and perform it. Hope it helps.

======================================= Use a sequence generator set properties as reset and then use filter put condition as NEXTVAL< 100 . =======================================

98.Informatica - can we modify the data in flat file?

QUESTION #98 No best answer available. Please pick the good answer available or submit your answer. October 04, 2005 23:19:25 ravikumar guturi


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RE: can we modify the data in flat file? Click Here to view complete document can't ======================================= Manually Yes. ======================================= yes ======================================= yes ======================================= Can you please explian how to do this without modifying the flat file manually? ======================================= Just open the text file with notepad change what ever you want (but datatype should be the same) Cheers sithu

======================================= yes by open a text file and edit ======================================= You can generate a flat file with program....mean not manually. ======================================= Let's not discuss about manually modifying the data of flat file. Let's assume that the target is a flat file. I want to update the data in the flat file target based on the input source rows. Like we use update strategy/ target properties in case of relational targets for update; do we have any options in the session or maaping to perform a similar task for a flat file target? I have heard about the append option in INFA 8.x. This may be helpful for incremental load in the flat file. But this is not a workaround for updating the rows. Please post your views. ======================================= You can modify the flat file using shell scripting in unix ( awk grep sed ). Hope this helps.



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99.Informatica - difference between summary filter and details filter?


December 01, 2005 09:52:34 renuka RE: difference between summary filter and details filt... Click Here to view complete document Hi Summary Filter --- we can apply records group by that contain common values. Detail Filter --- we can apply to each and every record in a database.

======================================= Will it be correct to say that Summary Filter ----> HAVING Clause in SQL Details Filter ------> WHERE Clause in SQL

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100.Informatica - what are the difference between view and materialized view?

QUESTION #100 No best answer available. Please pick the good answer available or submit your answer. Sorting Options

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September 30, 2005 00:34:20 khadarbasha


RE: what are the difference between view and materiali... Click Here to view complete document Materialized views are schema objects that can be used to summarize precompute replicate and distribute data. E.g. to construct a data warehouse. A materialized view provides indirect access to table data by storing the results of a query in a separate schema object. Unlike an ordinary view which does not take up any storage space or contain any data

======================================= view is a tailriad representaion of data its access data from existing table it have logical structure cant space occupation. but meterailzedview stores precaluculated data its have physical structure space occupation

======================================= view is a tailraid representation of data but metereialized view is stores precaluculated data view is a logical structure but mview is physical structure view is cant occupie the space bu mview is occpies space. ======================================= Diffence between View Materialized view If you (Change) update or insert in view the corresponding table will affect. but changes will not affect materialized view.

======================================= materialized views to store copies of data or aggregations.Materialized views can be used to replicate all or part of a single table or part of single table or to replicate the result of a query against multiple tables.refreshes of the replicated daa can be done automatically by the database at time intervals.



======================================= A view do no derive the change made to it master table after the view is created. A materialized view immediately carries the change done to its mater table even after the materialized view is created.

======================================= view- the select query is stored in the db. whenever u use select from view the stored query is executed. Effectively u r calling the stored query. In case u want use the query repetadly or complex queries we store the queries in Db using View. where as materialized view stores the data as well. like table. here storage parameters are required.

======================================= A view is just a stored query and has no physical part. Once a view is instantiated performance can be quite good until it is aged out of the cache. A materialized view has a physical table associated with it; it doesn't have to resolve the query each time it is queried. Depending on how large a result set and how complex the query a materialized view should perform better. ======================================= In materialized view we cann't perform DML operation but the reverse is true in case of simple view. ======================================= In case of materialised view we can perform DML but reverse is not true in case of simple view. =======================================

101.Informatica - What is the difference between summary filter and detail filter

QUESTION #101 No best answer available. Please pick the good answer available or submit your answer. November 23, 2005 15:07:50 sir RE: what is the difference between summary filter and ...


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Click Here to view complete document summary filter can be applieid on a group of rows that contain a common value.where as detail filters can be applied on each and every rec of the data base. =======================================

102.Informatica - CompareData Warehousing Top-Down approach withBottom-up approach

QUESTION #102 No best answer available. Please pick the good answer available or submit your answer. October 04, 2005 12:22:13 ravi kumar guturi RE: in datawarehousing approach(top/down) or (bottom/u... Click Here to view complete document bottom approach is the best because in 3 tier architecture datatier is the bottom one. ======================================= Top/down approach is better in datawarehousing

======================================= Rajesh: Bottom/Up approach is better

======================================= At the time of software intragartion buttom/up is good but implimentatino time top/down is good. ======================================= top down ODS-->ETL-->Datawarehouse-->Datamart-->OLAP Bottom up ODS-->ETL-->Datamart-->Datawarehouse-->OLAP Cheers file:///C|/Perl/bin/result.html (108 of 363)4/1/2009 7:50:58 PM

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Sithu

======================================= in top down approch: first we have to build dataware house then we will build data marts. which will need more crossfunctional skills and timetaking process also costly. in bottom up approach: first we will build data marts then data warehuse. the data mart that is first build will remain as a proff of concept for the others. less time as compared to above and less cost.

======================================= Nothing wrong with any of these approaches. It all depends on your business requirements and what is in place already at your company. Lot of folks have a hybrid approach. For more info read Kimball vs Inmon..

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103.Informatica - Discuss which is better among incremental load, Normal Load and Bulk load QUESTION #103 No best answer available. Please pick the good answer available or submit your answer. October 20, 2005 03:06:53 ravi guturi RE: incremental loading ? normal load and bulk load?


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Click Here to view complete document normal load is the best. ======================================= normal is always preffered over bulk.

======================================= It depends on the requirement. Otherwise Incremental load which can be better as it takes onle that data which is not available previously on the target.

======================================= If the database supports bulk load option from Infromatica then using BULK LOAD for intial loading the tables is recommended. Depending upon the requirment we should choose between Normal and incremental loading strategies.

======================================= Normal Loading is Better ======================================= Rajesh:Normal load is Better ======================================= RE: incremental loading ? normal load and bulk load?
======================================= if supported by the database bulk load can do the loading faster than normal load.(incremental load concept is differnt dont merge with bulk load mormal load) =======================================

104.Informatica - What is the difference between connected and unconnected stored procedures.



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sangeetha RE: What is the difference between connected and uncon... Click Here to view complete document Unconnected: The unconnected Stored Procedure transformation is not connected directly to the flow of the mapping. It either runs before or after the session or is called by an expression in another transformation in the mapping. connected: The flow of data through a mapping in connected mode also passes through the Stored Procedure transformation. All data entering the transformation through the input ports affects the stored procedure. You should use a connected Stored Procedure transformation when you need data from an input port sent as an input parameter to the stored procedure or the results of a stored procedure sent as an output parameter to another transformation.

======================================= Run a stored procedure before or after your session.

Unconnected

Run a stored procedure once during your mapping such as pre- or postsession.

Unconnected

Run a stored procedure every time a row passes through the Stored Procedure transformation.

Connected or Unconnected

Run a stored procedure based on data that passes through the mapping such as when a specific port does not contain a null value.

Unconnected

Pass parameters to the stored procedure and receive a single output parameter.


Pass parameters to the stored procedure and receive multiple output parameters. Note: To get multiple output parameters from an unconnected Stored Procedure transformation you must create variables for each output parameter. For details see Calling a Stored Procedure From an Expression.


Run nested stored procedures.

Unconnected



Call multiple times within a mapping.

Unconnected

Cheers Sithu

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105.Informatica - Differences between Informatica 6.2 and Informatica 7.0Yours sincerely,Rushi.

QUESTION #105 No best answer available. Please pick the good answer available or submit your answer. October 04, 2005 01:17:06 ravi RE: Differences between Informatica 6.2 and Informati... Click Here to view complete document in 7.0 intorduce custom transfermation and union transfermation and also flat file lookup condition. ======================================= Features in 7.1 are : 1.union and custom transformation 2.lookup on flat file 3.grid servers working on different operating systems can coexist on same server 4.we can use pmcmdrep 5.we can export independent and dependent rep objects 6.we ca move mapping in any web application 7.version controlling


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8.data profilling

======================================= Can someone guide me on 1) Data profiling. 2) Exporting independent and dependent objects. Thanks in advance. -Azhar

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106.Informatica - whats the diff between Informatica powercenter server, repositoryserver and repository? QUESTION #106 Powercenter server contains the sheduled runs at which time data should load from source to target Repository contains all the definitions of the mappings done in designer. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

November 08, 2005 01:59:02 Gokulnath_J


RE: whats the diff between Informatica powercenter ser...



======================================= Repository is a database in which all informatica componets are stored in the form of tables. The reposiitory server controls the repository and maintains the data integrity and Consistency across the repository when multiple users use Informatica. Powercenter Server/Infa Server is responsible for execution of the components (sessions) stored in the repository.

======================================= hi Repository is nothing but a set of tables created in a DB.it stores all metadata of the infa objects. Repository server is one which communicates with the repository i.e DB. all the metadata is retrived from the DB through Rep server.All the client tools communicate with the DB through Rep server. Infa server is one which is responsible for running the WF tasks etc... Infa server also communicates with the DB through Rep server.

======================================= power center server-power center server does the extraction from the source and loaded it to the target. repository server-it takes care of the connection between the power center client and repository. repository-it is a place where all the metadata information is stored.repository server and power center server access the repository for managing the data.

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107.Informatica - how to create the staging area in your database QUESTION #107 client having database throught that data base u get all sources Click Here to view complete document

No best answer available. Please pick the good answer available or submit your answer. November 02, 2005 11:56:42 Chandran


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RE: how to create the staging area in your database

======================================= If You have defined all the staging tables as tragets use option Targets--> Generate sql in warehouse designer

======================================= A Staging area in a DW is used as a temporary space to hold all the records from the source system. So more or less it should be exact replica of the source systems except for the laod startegy where we use truncate and reload options. So create using the same layout as in your source tables or using the Generate SQL option in the Warehouse Designer tab.

======================================= creating of staging tables/area is the work of data modellor/dba.just like create table ...... the tables will be created. they will have some name to identified as staging like dwc_tmp_asset_eval. tmp-----> indicate temparary tables nothing but staging

=======================================

108.Informatica - what does the expression n filter transformations do in Informatica Slowly growing target wizard?


November 02, 2005 23:10:06 sivapreddy


RE: what does the expression n filter transformations ...



Click Here to view complete document dontknow ======================================= EXPESSION transformation detects and flags the rows from source. Filter transformation filters the rows that are not flagged and passes the flagged rows to the Update strategy transformation

======================================= Expression finds the Primary key is or not and calculates new flag Based on that New Flag filter transformation filters the Data Cheers Sithu

======================================= You can use the Expression transformation to calculate values in a single row before you write to the target. For example you might need to adjust employee salaries concatenate first and last names or convert strings to numbers. =======================================

109.Informatica - Briefly explian the Versioning Concept in Power Center 7.1.

QUESTION #109 No best answer available. Please pick the good answer available or submit your answer. November 29, 2005 11:29:11 Manoj Kumar Panigrahi RE: Briefly explian the Versioning Concept in Power Ce...


#1


Click Here to view complete document In power center 7.1 use 9 Tem server i.e add in Look up. But in power center 6.x use only 8 tem server. and add 5 transformation . in 6.x anly 17 transformation but 7.x use 22 transformation. ======================================= Hi manoj I appreciate ur response But can u be a bit clear thanks sri

======================================= When you create a version of a folder referenced by shortcuts all shortcuts continue to reference their original object in the original version. They do not automatically update to the current folder version. For example if you have a shortcut to a source definition in the Marketing folder version 1.0.0 then you create a new folder version 1.5.0 the shortcut continues to point to the source definition in version 1.0.0. Maintaining versions of shared folders can result in shortcuts pointing to different versions of the folder. Though shortcuts to different versions do not affect the server they might prove more difficult to maintain. To avoid this you can recreate shortcuts pointing to earlier versions but this solution is not practical for much-used objects. Therefore when possible do not version folders referenced by shortcuts. Cheers Sithu

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110.Informatica - How to join two tables without using the Joiner Transformation.

QUESTION #110 No best answer available. Please pick the good answer available or submit your answer. December 01, 2005 07:49:58


#1


thiyagarajanc


RE: How to join two tables without using the Joiner Tr... Click Here to view complete document Itz possible to join the two or more tables by using source qualifier.But provided the tables should have relationship. When u drag n drop the tables u will getting the source qualifier for each table.Delete all the source qualifiers.Add a common source qualifier for all.Right click on the source qualifier u will find EDIT click on it.Click on the properties tab u will find sql query in that u can write ur sqls

======================================= The Joiner transformation requires two input transformations from two separate pipelines. An input transformation is any transformation connected to the input ports of the current transformation. Cheers Sithu

======================================= can do using source qualifer but some limitations are there. Cheers Sithu

======================================= joiner transformation is used to join n (n>1) tables from same or different databases but source qualifier transformation is used to join only n tables from same database . ======================================= simple In the session property user defined options is there by using this we can join with out joiner file:///C|/Perl/bin/result.html (118 of 363)4/1/2009 7:50:58 PM


======================================= use Source Qualifier transformation to join tables on the SAME database. Under its properties tab you can specify the user-defined join. Any select statement you can run on a database.. you can do also in Source Qualifier. Note: you can only join 2 tables with Joiner Transformation but you can join two tables from different databases. Cheers Ray Anthony

======================================= hi u can join 2 RDBMS sources of same database using a SQ by specifying user defined joins. u can also join two tables of same kind using a lookup.

=======================================

111.Informatica - Identifying bottlenecks in various components of Informatica and resolving them.

QUESTION #111 No best answer available. Please pick the good answer available or submit your answer. December 20, 2005 08:13:47 kalyan RE: Identifying bottlenecks in various components of I...


#1


Click Here to view complete document hai The best way to find out bottlenecks is writing to flat file and see where the bottle neck is . kalyan

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112.Informatica - How do you decide whether you need ti do aggregations at database level or at Informatica level?


#1

Rishi RE: How do you decide whether you need ti do aggregati... Click Here to view complete document It depends upon our requirment only.If you have good processing database you can create aggregation table or view at database level else its better to use informatica. Here i'm explaing why we need to use informatica. what ever it may be informatica is a thrid party tool so it will take more time to process aggregation compared to the database but in Informatica an option we called Incremental aggregation which will help you to update the current values with current values +new values. No necessary to process entire values again and again. Unless this can be done if nobody deleted that cache files. If that happend total aggregation we need to execute on informatica also. In database we don't have Incremental aggregation facility.

======================================= hi



see informatica is basically a integration tool.it all depends on the source u have and ur requirment.if u have a EMS Q or flat file or any source other than RDBMS u need info to do any kind of agg functions. if ur source is a RDBMS u r not only doing the aggregation using informatica right?? there will be a bussiness logic behind it. and u need to do some other things like looking up against some table or joining the agg result with the actual source. etc... if in informatica if u r asking whether to do it in the mapping level or at DB level then fine its always better to do agg at the DB level by using SQL over ride in SQ if only aggr is the main purpose of ur mapping. it definetly improves the performance.

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113.Informatica - Source table has 1000 rows. In session configuration --- target Load option-- \


April 10, 2007 23:51:51 Surendra Kumar RE: Source table has 1000 rows. In session configurati... Click Here to view complete document If you use bulk mode then it will be fast to load... ======================================= If ur database supported bulk option Then choose the bulk option. other wise go for normal option =======================================

114.Informatica - what is the procedure to write the query to list the highest salary of three employees?


December 01, 2005 07:31:41 thiyagarajanc




RE: what is the procedure to write the query to list t... Click Here to view complete document select sal from (select sal from emp order by sal desc) where rownum < 3;

======================================= SELECT sal FROM (SELECT sal FROM my_table ORDER BY sal DESC) WHERE ROWNUM < 4; ======================================= hai there is max function in Informatica use it. kalyan

======================================= since this is informatica.. you might as well use the Rank transformation. check out the help file on how to use it. Cheers Ray Anthony



======================================= select max(sal) from emp; ======================================= the following is the query to find out the top three salaries in ORACLE:--(take emp table) select * from emp e where 3>(select count (*) from emp where e.sal>emp.sal) order by sal desc. in SQL Server:-(take emp table) select top 10 sal from emp

======================================= You can write the query as follows.SQL> select * from 2 (select ename sal from emp order by sal desc) 3 where rownum< 3; =======================================

115.Informatica - which objects are required by the debugger to create a valid debug session?

QUESTION #115 No best answer available. Please pick the good answer available or submit your answer. December 05, 2005 03:15:32 Rishi RE: which objects are required by the debugger to crea...


#1


Click Here to view complete document Intially the session should be valid session. source target lookups expressions should be availble min 1 break point should be available for debugger to debug your session.

======================================= hi We can create a valid debug session even without a single break-point. But we have to give valid database connection details for sources targets and lookups used in the mapping and it should contain valid mapplets (if any in the mapping).

======================================= Informatica server must run ======================================= Informatica Server Object is must. Cheers Sithu

=======================================

116.Informatica - What is the limit to the number of sources and targets you can have in a mapping

QUESTION #116 No best answer available. Please pick the good answer available or submit your answer. December 05, 2005 03:21:24 Rishi RE: What is the limit to the number of sources and tar...


#1


Click Here to view complete document As per my knowledge there is no such restriction to use this number of sources or targets inside a mapping. Question is if you make N number of tables to participate at a time in processing what is the position of your database. I orginzation point of view it is never encouraged to use N number of tables at a time It reduces database and informatica server performance

======================================= the restriction is only on the database side. how many concurrent threads r u allowed to run on the db server? ======================================= there is one formula.. no.of bloccks 0.9*( DTM buffer size/block size)*no.of partitions. here no.of blocks (source+targets)*2

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117.Informatica - What is difference between IIF and DECODE function

QUESTION #117 No best answer available. Please pick the good answer available or submit your answer. December 16, 2005 10:27:07 VJ RE: What is difference between IIF and DECODE function...


#1


Click Here to view complete document You can use nested IIF statements to test multiple conditions. The following example tests for various conditions and returns 0 if sales is zero or negative: IIF( SALES > 0 IIF( SALES < 50 SALARY1 IIF( SALES < 100 SALARY2 IIF( SALES < 200 SALARY3 BONUS))) 0 ) You can use DECODE instead of IIF in many cases. DECODE may improve readability. The following shows how you can use DECODE instead of IIF : SALES > 0 and SALES < 50 SALARY1 SALES > 49 AND SALES < 100 SALARY2 SALES > 99 AND SALES < 200 SALARY3 SALES > 199 BONUS)

======================================= u can use decode in conditioning coloumns also while we cann't use iff but u can use case. but by using decode retrieveing data is quick ======================================= Decode can be used in select statement whereas IIF cannot be used. =======================================

118.Informatica - What are variable ports and list two situations when they can be used?

QUESTION #118 No best answer available. Please pick the good answer available or submit your answer. December 19, 2005 20:41:34 Rajesh RE: What are variable ports and list two situations wh...


#1


Click Here to view complete document We have mainly tree ports Inport Outport Variable port. Inport represents data is flowing into transformation. Outport is used when data is mapped to next transformation. Variable port is used when we mathematical caluculations are required. If any addition i will be more than happy if you can share. ======================================= you can also use as for example consider price and quantity and total as a varaible we can mak a sum on the total_amt by giving sum(tatal_amt)

======================================= For example if you are trying to calculate bonus from emp table Bonus sal*0.2 Totalsal sal+comm.+bonus

======================================= variable port is used to break the complex expression into simpler and also it is used to store intermediate values

======================================= Variable Ports usually carry intermediate data (values) and can be used in Expression transformation. =======================================

119.Informatica - How does the server recognise the source and target databases?

QUESTION #119 No best answer available. Please pick the good answer available or submit your answer. January 01, 2006 00:53:24 reddeppa


#1


RE: How does the server recognise the source and targe... Click Here to view complete document by using ODBC connection.if it is relational.if is flat file FTP connection..see we can make sure with connection in the properties of session both sources && targets. =======================================

120.Informatica - How to retrive the records from a rejected file. explane with syntax or example

QUESTION #120 No best answer available. Please pick the good answer available or submit your answer. January 01, 2006 00:51:13

#1

reddeppa RE: How to retrive the records from a rejected file. e... Click Here to view complete document there is one utility called reject Loader where we can findout the reject records.and able to refine and reload the rejected records.. ======================================= ya. every time u run the session one reject file will be created and all the reject files will be there in the reject file. u can modify the records and correct the things in the records and u can load them to the target directly from the reject file using Regect loader.if i am wrong pls. correct.kumar.V ======================================= can you explain how to load rejected rows thro informatica

======================================= During the execution of workflow all the rejected rows will be stored in bad files(where your informatica server get installed;C:\Program Files\Informatica PowerCenter 7.1\Server) These bad files can be imported as flat a file in source then thro' direct maping we can load these files in desired format. =======================================

121.Informatica - How to lookup the data on multiple tabels.

QUESTION #121 No best answer available. Please pick the good answer available or submit your answer. file:///C|/Perl/bin/result.html (128 of 363)4/1/2009 7:50:58 PM


January 05, 2006 12:05:06

#1

reddeppa How to lookup the data on multiple tabels. Click Here to view complete document why using SQL override..we can lookup the Data on multiple tables.See in the properties..tab.. ======================================= Hi Thanks for your responce. But my question is I have two sources or target tables i want to lookup that two sources or target tables. How can i. It is possible to SQL Override.

======================================= just check with import option

======================================= How to lookup the data on multiple tabels. ======================================= if u want to lookup data on multiple tables at a time u can do one thing join the tables which u want then lookup that joined table. informatica provieds lookup on joined tables hats off to informatica. ======================================= Hi You can do it. When you create lookup transformation that time INFA asks for table name so you can choose either source target import and skip. So click skip and the use the sql overide property in properties tab to join two table for lookup.

=======================================



join the two source by using the joiner transformation and then apply a look up on the resaulting table

======================================= hi what ever my friends have answered earlier is correct. to be more specific if the two tables are relational then u can use the SQL lookup over ride option to join the two tables in the lookup properties.u cannot join a flat file and a relatioanl table. eg: lookup default query will be select lookup table column_names from lookup_table. u can now continue this query. add column_names of the 2nd table with the qualifier and a where clause. if u want to use a order by then use -- at the end of the order by. hope this is more clear

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122.Informatica - What is the procedure to load the fact table.Give in detail? QUESTION #122 No best answer available. Please pick the good answer available or submit your answer. January 19, 2006 14:26:22 Guest RE: What is the procedure to load the fact table.Give ...


#1


Click Here to view complete document Based on the requirement to your fact table choose the sources and data and transform it based on your business needs. For the fact table you need a primary key so use a sequence generator transformation to generate a unique key and pipe it to the target (fact) table with the foreign keys from the source tables. Please correct if I am wrong.

======================================= we use the 2 wizards (i.e) the getting started wizard and slowly changing dimension wizard to load the fact and dimension tables by using these 2 wizards we can create different types of mappings according to the business requirements and load into the star schemas(fact and dimension tables).

======================================= first dimenstion tables need to be loaded then according to the specifications the fact tables should be loaded. dont think that fact tables r different in case of loading it is general mapping as we do for other tables. specifications will play important role for loading the fact. ======================================= hi usually source records are looked up with the records in the dimension table.DIM tables are called lookup or reference table. all the possible values are stored in DIM table. e.g product all the existing prod_id will be in DIM table. when data from source is looked up against the dim table the corresponding keys are sent to the fact table.this is not the fixed rule to be followed it may vary as per ur requirments and methods u follow.some times only the existance check will be done and the prod_id itself will be sent to the fact.

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123.Informatica - What is the use of incremental aggregation? Explain me in brief with an example.



#1


gazulas


RE: What is the use of incremental aggregation? Explai... Click Here to view complete document its a session option. when the informatica server performs incremental aggr. it passes new source data through the mapping and uses historical chache data to perform new aggregation caluculations incrementaly. for performance we will use it.

======================================= Incremental aggregation is in session properties i have 500 records in my source and again i got 300 records if u r not using incremental aggregation what are calculation r using on 500 records again that calculation will be done on 500+ 300 records if u r using incremental aggregation calculation will be done one only what are new records (300) that will be calculated dur to this one performance will increasing.

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124.Informatica - How to delete duplicate rows in flat files source is any option in informatica QUESTION #124 Submitted by: gazulas

use a sorter transformation , in that u will have a "distinct" option make use of it .

Above answer was rated as good by the following members: sn3508 Click Here to view complete document use a sorter transformation in that u will have a distinct option make use of it .

=======================================



hi u can use a dynamic lookup or an aggregator or a sorter for doing this.

======================================= Instead we can use 'select distinct' query in Source qualifier of the source Flat file. Correct me if I am wrong. ======================================= You cannot write SQL override for flat file =======================================

125.Informatica - how to use mapping parameters and what is their use


January 29, 2006 11:47:14 gazulas


RE: how to use mapping parameters and what is their us... Click Here to view complete document in designer u will find the mapping parameters and variables options.u can assign a value to them in designer. comming to there uses suppose u r doing incremental extractions daily. suppose ur source system contains the day column. so every day u have to go to that mapping and change the day so that the particular data will be extracted . if we do that it will be like a layman's work. there comes the concept of mapping parameters and variables. once if u assign a value to a mapping variable then it will change between sessions.

======================================= mapping parameters and variables make the use of mappings more flexible.and also it avoids creating of multiple mappings. it helps in adding incremental data.mapping parameters and variables has to create in the mapping designer by choosing the menu option as Mapping ----> parameters and variables and the enter the name for the variable or parameter but it has to be preceded by $$. and choose type as parameter/variable datatypeonce defined the variable/parameter is in the any expression for example in SQ transformation in the source filter prop[erties tab. just enter filter condition and finally create a parameter file to assgn the value for the variable / parameter and configigure the session properties. however the final step is optional. if ther parameter is npt present it uses the initial value which is file:///C|/Perl/bin/result.html (133 of 363)4/1/2009 7:50:58 PM


assigned at the time of creating the variable =======================================

126.Informatica - Can we use aggregator/active transformation after update strategy transformation


#1

jawahar RE: Can we use aggregator/active transformation after ... Click Here to view complete document we can use but the update flag will not be remain.but we can use passive transformation

======================================= I guess no update can be placed just before to the target qs per my knowledge ======================================= You can use aggregator after update strategy. The problem will be once you perform the update strategy say you had flagged some rows to be deleted and you had performed aggregator transformation for all rows say you are using SUM function then the deleted rows will be subtracted from this aggregator transformation. =======================================

127.Informatica - why dimenstion tables are denormalized in nature ?

QUESTION #127 No best answer available. Please pick the good answer available or submit your answer. January 31, 2006 04:05:43 Rahman RE: why dimenstion tables are denormalized in nature ?...


#1


Click Here to view complete document Because in Data warehousing historical data should be maintained to maintain historical data means suppose one employee details like where previously he worked and now where he is working all details should be maintain in one table if u maintain primary key it won't allow the duplicate records with same employee id. so to maintain historical data we are all going for concept data warehousing by using surrogate keys we can achieve the historical data(using oracle sequence for critical column). so all the dimensions are marinating historical data they are de normalized because of duplicate entry means not exactly duplicate record with same employee number another record is maintaining in the table.

======================================= dear reham thanks for ur responce First of all i want to tell one thing to all users who r using this site. please give answers only if u r confident about it. refer it once again in the manual its not wrong. If we give wrong answers lot of people who did't know the answer thought it as the correct answer and may fail in the interview. the site must be helpfull to other please keep that in the mind. regarding why dimenstion tables r in denormalised in nature. i had discussed with my project manager about this. what he told is :-> The attributes in a dimension tables are used over again and again in queries. for efficient query performance it is best if the query picks up an attribute from the dimension table and goes directly to the fact table and do not thru the intermediate tables. if we normalized the dimension table we will create such intermediate tables and that will not be efficient

======================================= Yes what your manager told is correct. Apart from this we maintain Hierarchy in these tables. Maintaining Hierarchy is pretty important in the dwh environment. For example if there is a child table and then a parent table. if both child and parent are kept in different tables one has to every time join or query both these tables to get the parent child relation. so if we have both child and parent in the same table we can always refer immediately. this may be a case. Similary if we have a hierarchy something like this...county > city > state > territory > division > region > nation If we have different tables for all it would be a waste of database space and also we need to query all file:///C|/Perl/bin/result.html (135 of 363)4/1/2009 7:50:58 PM


these tables everytime. Thats why we maintain hierarchy in dimension tables and based on the business we decide whether to maintain in the same table or different tables.

======================================= hello everyone i don't know the answer of this question but i ve to tell u that how can we say that dimension table is denormalized because in snowflake schema we normalized all the dimension tables. what would be ur comment on this??

======================================= I am a beginner to DW but as I know fact tables - Denormalized And Dimension Tables - Normalized. If I am wrong please correct.

======================================= De-normalization is basically the concept of keeping all the dimension hierarchies in a single dimensions tables. This causes less number of joins while retriving data from dimensions and hence faster data retrival. This is why dimensions in OLAP systems are de-normalized. =======================================

128.Informatica - In a sequential Batch how can we stop single session? QUESTION #128 Submitted by: prasadns26 hi, we can stop it using PMCMD command or in the monitor right click on that perticular session and select stop.this will stop the current session and the sessions next to it.



Above answer was rated as good by the following members: sn3508 Click Here to view complete document we have a task called wait event using that we can stop. we start using raise event. this is as per my knowledge.

======================================= hi we can stop it using PMCMD command or in the monitor right click on that perticular session and select stop.this will stop the current session and the sessions next to it.

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129.Informatica - How do you handle decimal places while importing a flatfile into informatica?

QUESTION #129 No best answer available. Please pick the good answer available or submit your answer. February 11, 2006 20:44:03 rajendar RE: How do you handle decimal places while importing a...


#1


Click Here to view complete document while geeting the data from flat file in informatica ie import data from flat file it will ask for the precision just enter that

======================================= while importing the flat file the flat file wizard helps in configuring the properties of the file so that select the numeric column and just enter the precision value and the scale. precision includes the scale for example if the number is 98888.654 enter precision as 8 and scale as 3 and width as 10 for fixed width flat file ======================================= you can handle that by simply using the source analyzer window and then go to the ports of that flat file representations and changing the precision and scales. ======================================= hi while importing flat file definetion just specify the scale for a neumaric data type. in the mapping the flat file source supports only number datatype(no decimal and integer). In the SQ associated with that source will have a data type as decimal for that number port of the source. source ->number datatype port ->SQ -> decimal datatype.Integer is not supported. hence decimal is taken care.

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130.Informatica - If you have four lookup tables in the workflow. How do you troubleshoot to improve performance?

QUESTION #130 No best answer available. Please pick the good answer available or submit your answer. February 10, 2006 15:51:01 swapna Use shared cache


#1


Click Here to view complete document When a workflow has multiple lookup tables use shered cache . ======================================= there r many ways to improve the mapping which has multiple lookups. 1) we can create an index for the lookup table if we have permissions(staging area). 2) divide the lookup mapping into two (a) dedicate one for insert means: source - target these r new rows . only the new rows will come to mapping and the process will be fast . (b) dedicate the second one to update : source target these r existing rows. only the rows which exists allready will come into the mapping. 3)we can increase the chache size of the lookup.

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131.Informatica - How do I import VSAM files from source to target. Do I need a special plugin

QUESTION #131 No best answer available. Please pick the good answer available or submit your answer. February 13, 2006 08:52:18

#1

swati RE: How do I import VSAM files from source to target. ... Click Here to view complete document As far my knowledge by using power exchange tool convert vsam file to oracle tables then do mapping as usual to the target table. ======================================= Hi In mapping Designer we have direct option to import files from VSAM Navigation : Sources > Import from file > file from COBOL. Thanks



Farid khan Pathan.

======================================= Yes you will need PowerExchange. With the product you can read from and write to VSAM. I have used it to read VSAM from one mainframe platform and write to a different platform. Have worked on KSDS and ESDS file types. You will need PowerExchange client on your platform and a PowerExchange listener on each of the mainframe platform(s) that you wish to work on. ======================================= PowerExchange does not need to copy your VSAM file to Oracle unless you want to do that. It can do a direct read/write to VSAM.

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132.Informatica - Differences between Normalizer and Normalizer transformation.

QUESTION #132 No best answer available. Please pick the good answer available or submit your answer. March 08, 2006 06:03:58

#1

ravi kumar guturi RE: Differences between Normalizer and Normalizer tran... Click Here to view complete document Normalizer: It is a transormation mainly using for cobol sources it's change the rows into coloums and columns into rows Normalization:To remove the retundancy and inconsitecy

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133.Informatica - What is IQD file?



#1

February 27, 2006 05:41:52 sathyanath.gopi


RE: What is IQD file? Click Here to view complete document IQD file is nothing but Impromptu Query Definetion This file is maily used in Cognos Impromptu tool after creating a imr( report) we save the imr as IQD file which is used while creating a cube in power play transformer.In data source type we select Impromptu Query Definetion. ======================================= IQD file is nothing but Impromptu Query Definition.This file used for creating cubes in COGNOS Powerplay Transformer. =======================================

134.Informatica - What is data merging, data cleansing, sampling?


#1

ravi kumar guturi RE: What is data merging, data cleansing, sampling? Click Here to view complete document simply man Cleansing:---TO identify and remove the retundacy and inconsistency sampling: just smaple the data throug send the data from source to target

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135.Informatica - How to import oracle sequence into Informatica. QUESTION #135 No best answer available. Please pick the good answer available or submit your answer.



February 15, 2006 05:39:04

#1

sunil kumar RE: How to import oracle sequence into Informatica. Click Here to view complete document CREATE ONE PROCEDURE AND DECLARE THE SEQUENCE INSIDE THE PROCEDURE FINALLY CALL THE PROCEDURE IN INFORMATICA WITH THE HELP OF STORED PROCEDURE TRANSFORMATION.if still is there any problem please contact me.Thanks Good Luck! ======================================= Hi sunil I got a problem with this...Can you jsut tell me a procedure to generate sequence number in SQl like... if i give n no of emplyees it should generate seq.and i want to use them in informatica...using stored procedure and load them into target.. can u help me with this.. thanks

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136.Informatica - With out using Updatestretagy and sessons options, how we can do the update our target table?

QUESTION #136 No best answer available. Please pick the good answer available or submit your answer. February 14, 2006 23:48:35 Saritha RE: With out using Updatestretagy and sessons options,...


#1


Click Here to view complete document you can use this by using update override in target properties ======================================= using update override in target option. ======================================= In session properties There is an option insert update insert as update update as update like that by using this we will easily solve

======================================= By default all the rows in the session is set as insert flag you can change it in the session general properties -- Treate source rows as :update so all the incoming rows will be set with update flag.now you can update the rows in the target table

======================================= hi if ur database is teradata we can do it with a tpump or mload external loader. update override in target properties is used basically for updating the target table based on a non key column.e.g update by ename.its not a key column in the EMP table.But if u use a UPD or session level properties it necessarily should have a PK.

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137.Informatica - Two relational tables are connected to SQ Trans, what are the possible errors it will be thrown? QUESTION #137 No best answer available. Please pick the good answer available or submit your answer. #1

February 18, 2006 08:45:49 geek_78


RE: Two relational tables are connected to SQ Trans,wh... Click Here to view complete document We can connect two relational table in one sq Transformation.No errors will be perform Regards R.Karthikeyan

======================================= The only two possibilities as of I know is 1. Both the table should have primary key/foreign key relation ship 2. Both the table should be available in the same schema or same database

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138.Informatica - what are partition points? QUESTION #138 Submitted by: saritha

Partition points mark the thread boundaries in a source pipeline and divide the pipeline into stages.



Above answer was rated as good by the following members: sn3508 Click Here to view complete document Partition points mark the thread boundaries in a source pipeline and divide the pipeline into stages.

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139.Informatica - what are cost based and rule based approaches and the difference


#1

Gayathri RE: what are cost based and rule based approaches and ... Click Here to view complete document Cost based and rule based approaches are the optimization techniques which are used in related to databases where we need to optimize a sql query. Basically Oracle provides Two types of Optimizers (indeed 3 but we use only these two techniques. bcz the third has some disadvantages.) When ever you process any sql query in Oracle what oracle engine internally does is it reads the query and decides which will the best possible way for executing the query. So in this process Oracle follows these optimization techniques. 1. cost based Optimizer(CBO): If a sql query can be executed in 2 different ways ( like may have path 1 and path2 for same query) then What CBO does is it basically calculates the cost of each path and the analyses for which path the cost of execution is less and then executes that path so that it can optimize the quey execution. 2. Rule base optimizer(RBO): this basically follows the rules which are needed for executing a query. So depending on the number of rules which are to be applied the optimzer runs the query.



Use: If the table you are trying to query is already analysed then oracle will go with CBO. If the table is not analysed the Oracle follows RBO. For the first time if table is not analysed Oracle will go with full table scan.

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140.Informatica - what is mystery dimention?


#1

Reddy RE: what is mystery dimention? Click Here to view complete document using Mystery Dimension ur maitaining the mystery data in ur Project. ======================================= Plz explain me Clearly what is meant by Mystery Dimension? ======================================= Also known as Junk Dimensions Making sense of the rogue fields in your fact table.. Please read the article http://www.intelligententerprise.com/000320/webhouse.jhtml

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141.Informatica - what is difference b/w Informatica 7.1 and Abinitio



February 24, 2006 01:25:58

#1

Niraj Kumar RE: what is difference b/w Informatica 7.1 and Abiniti... Click Here to view complete document in Informatica there is the concept of co-operating system which makes the mapping in parallel fashion which is not in Informatica

======================================= There is a lot of diffrence between informatica an Ab Initio In Ab Initio we r using 3 parllalisim but Informatica using 1 parllalisim In Ab Initio no scheduling option we can scheduled manully or pl/sql script but informatica contains 4 scheduling options Ab Inition contains co-operating system but informatica is not Ramp time is very quickly in Ab Initio campare than Informatica Ab Initio is userfriendly than Informatica

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142.Informatica - What is Micro Strategy? Why is it used for? Can any one explain in detail about it?



March 11, 2006 03:28:52

#1

kundan RE: What is Micro Strategy? Why is it used for? Can an... Click Here to view complete document Micro strategy is again an BI tool whicl is a HOLAP... u can create 2 dimensional report and also cubes in here.......basically a reporting tool. IT HAS A FULL RANGE OF REPORTING ON WEB ALSO IN WINDOWS. =======================================

143.Informatica - Can i start and stop single session in concurent bstch?


#1

ravi kumar guturi RE: Can i start and stop single session in concurent b... Click Here to view complete document ya shoor Just right click on the particular session and going to recovery option or by using event wait and event rise

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144.Informatica - what is the gap analysis?

QUESTION #144 No best answer available. Please pick the good answer available or submit your answer. April 11, 2007 10:55:26


#1


vizaik

Member Since: March 2007 Contribution: 30

RE: what is the gap analysis? Click Here to view complete document For a project there will be: 1.BRD(Business Requirement Document)-BA 2.SSSD(Source System Study Document)-BA BRD consists of the requirements of the client. SSSD consists of the source system study. The source that does not the meet the requiremnts specified in BRD using the source given in the SSSD is treated as gap analysis. or in one word the difference between 1 and 2 is called gap analysis. =======================================

145.Informatica - what is the difference between stop and abort


#1

Sirisha RE: what is the difference between stop and abort Click Here to view complete document The PowerCenter Server handles the abort command for the Session task like the stop command except it has a timeout period of 60 seconds. If the PowerCenter Server cannot finish processing and committing data within the timeout period it kills the DTM process and terminates the session. ======================================= stop: _______If the session u want to stop is a part of batch you must stop the batch if the batch is part of nested batch Stop the outer most bacth\ Abort:---You can issue the abort command it is similar to stop command except it has 60 second time out .



If the server cannot finish processing and commiting data with in 60 sec

======================================= Stop: In this case data query from source databases is stopped immediately but whatever data has been loaded into buffer there transformations and loading contunes.Abort: Same as Stop but in this case maximum time allowed for buffered data is 60 Seconds. ======================================= Stop: In this case data query from source databases is stopped immediately but whatever data has been loaded into buffer there transformations and loading contunes. Abort: Same as Stop but in this case maximum time allowed for buffered data is 60 Seconds. =======================================

146.Informatica - can we run a group of sessions without using workflow manager


March 05, 2006 23:48:38 Reddy RE: can we run a group of sessions without using workf... Click Here to view complete document

ya Its Posible using pmcmd Command with out using the workflow Manager run the group of session. as per my knowledge i give the answer.

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147.Informatica - what is meant by complex mapping,


March 13, 2006 02:46:29 satyam_un




RE: what is meant by complex mapping, Click Here to view complete document complex mapping means having more business rules . ======================================= Complex maping means involved in more logic and more business rules. Actually in my project complex mapping is In my bank project I involved in construct a 1 dataware house Meny customer is there in my bank project They r after taking loans relocated in to another place that time i feel to diffcult maintain both prvious and current adresses in the sense i am using scd2 This is an simple example of complex mapping

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148.Informatica - explain use of update strategy transformation

QUESTION #148 No best answer available. Please pick the good answer available or submit your answer. March 22, 2006 00:00:52 satyambabu RE: explain use of update strategy transformation


#1


Click Here to view complete document maintain the history data and maintain the most recent changaes data. ======================================= To flag source records as INSERT DELETE UPDATE or REJECT for target database. Default flag is Insert. This is must for Incremental Data Loading. =======================================

149.Informatica - what are mapping parameters and varibles in which situation we can use it


#1

Girish RE: what are mapping parameters and varibles in which ... Click Here to view complete document Mapping parameters have a constant value through out the session whereas in mapping variable the values change and the informatica server saves the values in the repository and uses next time when u run the session.

======================================= If we need to change certain attributes of a mapping after every time the session is run it will be very difficult to edit the mapping and then change the attribute. So we use mapping parameters and variables and define the values in a parameter file. Then we could edit the parameter file to change the attribute values. This makes the process simple. Mapping parameter values remain constant. If we need to change the parameter value then we need to edit the parameter file . But value of mapping variables can be changed by using variable function. If we need to increment the attribute value by 1 after every session run then we can use mapping variables . In a mapping parameter we need to manually edit the attribute value in the parameter file after every session run. file:///C|/Perl/bin/result.html (152 of 363)4/1/2009 7:50:58 PM


======================================= How can you edit the parameter file? Once you setup a mapping variable how can you define them in a parameter file? =======================================

150.Informatica - what is worklet and what use of worklet and in which situation we can use it QUESTION #150 Submitted by: SSekar

Worklet is a set of tasks. If a certain set of task has to be reused in many workflows then we use worklets. To execute a Worklet, it has to be placed inside a workflow. The use of worklet in a workflow is similar to the use of mapplet in a mapping.

Above answer was rated as good by the following members: sn3508 Click Here to view complete document A set of worlflow tasks is called worklet Workflow tasks means 1)timer2)decesion3)command4)eventwait5)eventrise6)mail etc...... But we r use diffrent situations by using this only

======================================= Worklet is a set of tasks. If a certain set of task has to be reused in many workflows then we use worklets. To execute a Worklet it has to be placed inside a workflow. The use of worklet in a workflow is similar to the use of mapplet in a mapping.



Worklet is reusable workflows. It might contain more than on task in it. We can use these worklets in other workflows. ======================================= Besides the reusability of a worklet as mentioned above we can also use a worklet to group related sessions together in a very big workflow. Suppose we have to extract a file and then load a fact table in the workflow we can use one worklet to load/update dimensions. =======================================

151.Informatica - How do you configure mapping in informatica


#1

suresh RE: How do you configure mapping in informatica Click Here to view complete document You should configure the mapping with the least number of transformations and expressions to do the most amount of work possible. You should minimize the amount of data moved by deleting unnecessary links between transformations. For transformations that use data cache (such as Aggregator Joiner Rank and Lookup transformations) limit connected input/output or output ports. Limiting the number of connected input/output or output ports reduces the amount of data the transformations store in the data cache. You can also perform the following tasks to optimize the mapping: ● ● ● ● ●

Configure single-pass reading. Optimize datatype conversions. Eliminate transformation errors. Optimize transformations. Optimize expressions. You should configure the mapping with the least number of transformations and expressions to do the most amount of work possible. You should minimize the amount of data moved by deleting unnecessary links between transformations. For transformations that use data cache (such as Aggregator Joiner Rank and Lookup transformations) limit connected input/output or output ports. Limiting the number of connected input/output or output ports reduces the amount of data the transformations store in the data cache.



You can also perform the following tasks to optimize the mapping: ❍ ❍ ❍ ❍ ❍

Configure single-pass reading. Optimize datatype conversions. Eliminate transformation errors. Optimize transformations. Optimize expressions.

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152.Informatica - Can i use a session Bulk loading option that time can i make a recovery to the session? QUESTION #152 Submitted by: SSekar

If the session is configured to use in bulk mode it will not write recovery information to recovery tables. So Bulk loading will not perform the recovery as required. Above answer was rated as good by the following members: sn3508 Click Here to view complete document It's not possible ======================================= If the session is configured to use in bulk mode it will not write recovery information to recovery tables. So Bulk loading will not perform the recovery as required. ======================================= no why because in bulk load u wont create redo log file when u normal load we create redo log file but in bulk load session performance increases

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153.Informatica - what is difference between COM & DCOM?

QUESTION #153 No best answer available. Please pick the good answer available or submit your answer. October 05, 2006 01:23:48 balaji


#1


RE: what is difference between COM & DCOM? Click Here to view complete document Hai COM is technology developed by Microsoft which is based on OO Design .COM Componenets exposes its interfaces at interface pointer where client access Components intrerface. DCOM is the protocol which enables the s/w componenets in different machine to communicate with each other through n/w .

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154.Informatica - what are the enhancements made to Informatica 7.1.1 version when compared to 6.2.2 version?


April 04, 2006 01:07:29 sn3508

Member Since: April 2006 Contribution: 20

RE: what are the enhancements made to Informatica 7.1.... Click Here to view complete document I'm a newbie. Correct me if I'm wrong. In 7+ versions - we can lookup a flat file - union and custom transformation - there is propogate option i.e if we change any datatype of a field all the linked columns will reflect that change



- we can write to XML target. - we can use upto 64 partitions

======================================= 1.union & custom transformation 2.lookup on flatfile 3.we can use pmcmd command 4.we can export independent&dependent repository objects 5.version controlling 6.data proffiling 7.supporting of 64mb architecture 8.ldap authentication

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155.Informatica - how do you create a mapping using multiple lookup transformation?

QUESTION #155 No best answer available. Please pick the good answer available or submit your answer. March 30, 2006 16:26:57 Sri RE: how do you create a mapping using multiple lookup ...


#1


Click Here to view complete document Use Multiple Lookups in the mapping ======================================= Use unconnected lookup if same lookup repeats multiple times. ======================================= u mean only look up trf and not any other transformations? be clear? if not one senario is that we can use multiple connected loopup trf depending upon the target.if u have different wh_keys in ur target table and ur souce table only has its columns but not wh_keys.so inorder to connect coloumn to wh_key coloumn eg:sales_branch...>wh_sales_branch.we use multiple look ups.depending upon the targets =======================================

156.Informatica - what is the exact meaning of domain?

QUESTION #156 No best answer available. Please pick the good answer available or submit your answer. May 01, 2006 16:51:12

#1

kalyan RE: what is the exact meaning of domain? Click Here to view complete document a particular environment or a name that identifies one or more IP addressesexample gov - Government agencies edu - Educational institutions org - Organizations (nonprofit) mil - Military com - commercial business net - Network organizations ca - Canada th - Thailand in - India ======================================= Domain is nothing but give a comlete information on a particular subject area.. like sales domain telecom domain..etc

======================================= Domain in Informatica means - A central Global repository (GDR) along with the registered Local repositories (LDR) to this GDR. This is possible only in PowerCenter and not PowerMart. ======================================= In Database parlance you can define a domain a set of all possible permissible values for any attribute . Like you can say the domain for attribute Credit Card No# consists of all possible valid 16 digit numbers. Thanks. file:///C|/Perl/bin/result.html (158 of 363)4/1/2009 7:50:58 PM


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157.Informatica - what is the hierarchies in DWH


#1

kalyan RE: what is the hierarchies in DWH Click Here to view complete document Data sources ---> Data acquisition ---> Warehouse ---> Front end tools ---> Metadata management ---> Data warehouse operation management ======================================= Hierarchy in DWH is nothing but an ordered series of related dimensions grouped together to perform multidimensional analysis. =======================================

158.Informatica - Difference between Rank and Dense Rank? QUESTION #158 Submitted by: sm1506 Rank: 1 2<--2nd position 2<--3rd position 4 5

Same Rank is assigned to same totals/numbers. Rank is followed by the Position. Golf game ususally Ranks this way. This is usually a Gold Ranking. Dense Rank: 1 2<--2nd position 2<--3rd position file:///C|/Perl/bin/result.html (159 of 363)4/1/2009 7:50:58 PM


3 4 Same ranks are assigned to same totals/numbers/names. the next rank follows the serial number.

Above answer was rated as good by the following members: sn3508 Click Here to view complete document Rank: 1 2<--2nd position 2<--3rd position 4 5 Same Rank is assigned to same totals/numbers. Rank is followed by the Position. Golf game ususally Ranks this way. This is usually a Gold Ranking. Dense Rank: 1 2<--2nd position 2<--3rd position 3 4 Same ranks are assigned to same totals/numbers/names. the next rank follows the serial number.

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159.Informatica - can anyone explain about incremental aggregation with an example?



#1


maverickwild


RE: can anyone explain about incremental aggregation w... Click Here to view complete document When you use aggregator transformation to aggregate it creates index and data caches to store the data 1. Of group By columns 2. Of aggreagte columns the incremental aggreagtion is used when we have historical data in place which will be used in aggregation incremental aggregation uses the cache which contains the historical data and for each group by column value already present in cache it add the data value to its corresponding data cache value and outputs the row in case of a incoming value having no match in index cache the new values for group by and output ports are inserted into the cache .

======================================= Incremental aggregation is specially used for tune the performance of the aggregator. It captures the change each time (incrementally) you run the transformation and then performs the aggregation function to the changed rows and not to the entire rows. This improves the performance because you are not reading the entire source each time you run the session. =======================================

160.Informatica - What is meant by Junk Attribute in Informatica? QUESTION #160 No best answer available. Please pick the good answer available or submit your answer. April 17, 2006 10:10:23 raghavendra RE: What is meant by Junk Attribute in Informatica?


#1


Click Here to view complete document Junk Dimension A Dimension is called junk dimension if it contains attribute which are rarely changed ormodified. example In Banking Domain we can fetch four attributes accounting to a junk dimensions like from the Overall_Transaction_master table tput flag tcmp flag del flag advance flag all these attributes can be a part of a junk dimensions. thankxregards raghavendra ======================================= Hi In the requirment collection phase all the attributes that are likely to be used in any dimension will be gathered. while creating a dimension we use all the related attributes of that dimesion from the gathered list. At the last a dimension will be created with all the left over attributes which is usually called as JUNK Dimension and the attributes are called JUNK Attributes.

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161.Informatica - Informatica Live Interview Questions

QUESTION #161 here are some of the interview questions i could not answer, any body can help giving answers for others also. thanks in advance. Explain grouped cross tab? Explain reference cursor What are parallel query's and query hints What is meta data and system catalog What is factless fact schema What is confirmed dimension Which kind of index is preferred in DWH Why do we use DSS database for OLAP tools Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

April 17, 2006 07:27:07 binoy_pa RE: Informatica Live Interview Questions




======================================= confirmed dimension one dimension that shares with two fact table factless means fact table without measures only contains foreign keys-two types of factless table one is event tracking and other is covergae table Bit map indexes preffered in the data ware housing Metedata is data about data here every thing is stored example-mapping sessions privileges other data in informatica we can see the metedata in the repository. System catalog that we used in the cognos that also contains data tables privileges predefined filter etc using this catalog we generate reports group cross tab is a type of report in cognos where we have to assign 3 measures for getting the result

======================================= Hi Bin I doubt your answer about the Grouped Cross Tab where you said 3 measure are to be specified which i feel is wrong. I think that grouped cross tab has only one measure but the side and row headers are grouped like India China Mah | Goa XYZ | PQR 2000 20K 30K 45K 55K 2001 39K 60K 34K 66K Here the cross tab is grouped on Country and then State. Similary even we can go further to drill year to Quarters. And this is known gruped Cross tab. file:///C|/Perl/bin/result.html (163 of 363)4/1/2009 7:50:58 PM


======================================= The cursor which is not declared in the declaration section but in executable section where we can give the table name dynamically there.so that the cursor can fetch the data from that table

======================================= grouped cross tab is the single report which contains number of crosstab report based on the grouped items. like Here countries are groupe items. INDIA M1 M2 Banglore

542 542

Hyderabad 255 458 Chennai

45

254

USA M1

M2

LA

578

5876

Chicago

4785 546

Washington DC 548

556

PAKISTAN M1

M2

Lahore

457

875

Karachi

458

687

Islamabad 7894 64 Thanks



======================================= Hi Rest of the answers are given by friends earlier. DSS->Decision Support System. The purpose of a DWH is to provide users data through which they can make their critical besiness decisions. DSS data base is nothing but a DWH. OLAP tools obviously use data from a DWH which is transformed to generate reports. These reports are used by the users analysts to extract strategic information which helps in decision making.

======================================= The Default Index type for DWH is bitmap(non-unique)index =======================================

162.Informatica - how do we remove the staging area

QUESTION #162 No best answer available. Please pick the good answer available or submit your answer. June 08, 2006 12:39:29 Hanu RE: how do we remove the staging area


#1


Click Here to view complete document Are u talking in the DW or in Informatica? If u want any staging area dont create staging DB. Load data directly into Target Hanu.

======================================= hi this question is logically not correct. staging area is just a set of intermediate tables.u can create or maintain these tables in the same database as of ur DWH or in a different DB.These tables will be used to store data from the source which will be cleaned transformed and undergo some business logic.Once the source data is done with the above process data from STG will be populated to the final Fact table through a simple one to one mapping.

======================================= Hi 1)At DB level we can simply DROP the stagin table. 2)then Create Target table at DB level. 3) Directly LOAD the records into target table. NOTE: It is recommended to use staging area. =======================================

163.Informatica - what is polling?

QUESTION #163 It displays update information about the session in the monitor window. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. May 01, 2006 16:32:38 kalyan RE: what is polling?


#1


======================================= It displays the updated information about the session in the monitor window. The monitor window displays the status of each session when you poll the Informatica server. =======================================

164.Informatica - What is Transaction?


#1

vishali RE: What is Transaction? Click Here to view complete document A transaction can be define as DML operation. means it can be insertion modification or deletion of data performed by users/ analysts/applicators

======================================= transaction is nothing but changing one window to another window during process ======================================= Transaction is a set of rows bound by commit or rollback. ======================================= Hi Transaction is any event that indicates some action. In DB terms any commited changes occured in the database is said to be transaction.

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165.Informatica - what happens if you try to create a shortcut to a non-shared folder?

QUESTION #165 No best answer available. Please pick the good answer available or submit your file:///C|/Perl/bin/result.html (167 of 363)4/1/2009 7:50:58 PM


answer. #1

April 14, 2006 14:59:17 sunil_reddy


RE: what happens if you try to create a shortcut to a ... Click Here to view complete document It only creates a copy of it.. =======================================

166.Informatica - In a joiner trasformation, you should specify the source with fewer rows as the master source. Why? QUESTION #166 No best answer available. Please pick the good answer available or submit your answer. April 14, 2006 09:02:38

#1

vishali RE: In a joiner trasformation, you should specify the ... Click Here to view complete document in joinner transformation informatica server reads all the records from master source builds index and data caches based on master table rows.after building the caches the joiner transformation reads records from the detail source and perform joins ======================================= Joiner transformation compares each row of the master source against the detail source. The fewer unique rows in the master the fewer iterations of the join comparison occur which speeds the join process.

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167.Informatica - Where is the cache stored in informatica?



#1


shekar25_g


RE: Where is the cache stored in informatica? Click Here to view complete document cache stored in informatica is in informatica server. ======================================= Hi Cache is stored in the Informatica server memory and over flowed data is stored on the disk in file format which will be automatically deleted after the successful completion of the session run. If you want to store that data you have to use a persistant cache.

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168.Informatica - can batches be copied/stopped from server manager?


#1

MOOTATI RAGHAVENDROA REDDY RE: can batches be copied/stopped from server manager?... Click Here to view complete document yes we can stop the batches using server manager or pmcmd commnad =======================================

169.Informatica - what is rank transformation?where can we use this transformation?

QUESTION #169 No best answer available. Please pick the good answer available or submit your answer. April 18, 2006 01:56:38 madhan


#1


RE: what is rank transformation?where can we use this ... Click Here to view complete document Rank transformation is used to find the status.ex if we have one sales table and in this if we find more employees selling the same product and we are in need to find the first 5 0r 10 employee who is selling more products.we can go for rank transformation. ======================================= It is used to filter the data from top/from buttom according to the condition. ======================================= To arrange records in Hierarchical Order and to selecte TOP or BOTTOM records. It is same as START WITH and CONNECT BY PRIOR clauses. ======================================= It is an active transformation which is used to identify the top and bottom values based on the numerics . by deafult it will create a rankindex port to caliculate the rank

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170.Informatica - Can Informatica load heterogeneous targets from heterogeneous sources?

QUESTION #170 No best answer available. Please pick the good answer available or submit your answer. April 26, 2006 01:22:19 Anant RE: Can Informatica load heterogeneous targets from he...


#1


Click Here to view complete document Yes it can. For example...Flat File and Relations sources are joined in the mapping and later Flat File and relational targets are loaded.

======================================= yes informatica for load the data form the heterogineous sources to heterogeneous target.

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171.Informatica - how do you load the time dimension.


#1

Appadu Dora P RE: how do you load the time dimension. Click Here to view complete document Time Dimension will generally load manually by using PL/SQL shell scripts proc C etc......

======================================= create a procedure to load data into Time Dimension. The procedure needs to run only once to popullate all the data. For eg the code below fills up till 2015. You can modify the code to suit the feilds in ur table. create or replace procedure QISODS.Insert_W_DAY_D_PR as LastSeqID number default 0; loaddate Date default to_date('12/31/1979' 'mm/dd/yyyy'); begin Loop LastSeqID : LastSeqID + 1; loaddate : loaddate + 1; INSERT into QISODS.W_DAY_D values( file:///C|/Perl/bin/result.html (171 of 363)4/1/2009 7:50:58 PM


LastSeqID Trunc(loaddate) Decode(TO_CHAR(loaddate 'Q') '1' 1 decode(to_char(loaddate 'Q') '2' 1 2) ) TO_FLOAT(TO_CHAR(loaddate 'MM')) TO_FLOAT(TO_CHAR(loaddate 'Q')) trunc((ROUND(TO_DECIMAL(to_char(loaddate 'DDD'))) + ROUND(TO_DECIMAL(to_char(trunc(loaddate 'YYYY') 'D')))+ 5) / 7) TO_FLOAT(TO_CHAR(loaddate 'YYYY')) TO_FLOAT(TO_CHAR(loaddate 'DD')) TO_FLOAT(TO_CHAR(loaddate 'D')) TO_FLOAT(TO_CHAR(loaddate 'DDD')) 1 1 1 1 1 TO_FLOAT(TO_CHAR(loaddate 'J')) ((TO_FLOAT(TO_CHAR(loaddate 'YYYY')) + 4713) * 12) + TO_number(TO_CHAR(loaddate 'MM')) ((TO_FLOAT(TO_CHAR(loaddate 'YYYY')) + 4713) * 4) + TO_number(TO_CHAR(loaddate 'Q')) TO_FLOAT(TO_CHAR(loaddate 'J'))/7 TO_FLOAT (TO_CHAR (loaddate 'YYYY')) + 4713 TO_CHAR(load_date 'Day') TO_CHAR(loaddate 'Month') Decode(To_Char(loaddate 'D') '7' 'weekend' '6' 'weekend' 'weekday') Trunc(loaddate 'DAY') + 1 Decode(Last_Day(loaddate) loaddate 'y' 'n') to_char(loaddate 'YYYYMM') to_char(loaddate 'YYYY') || ' Half' || Decode(TO_CHAR(loaddate 'Q') '1' 1 decode(to_char(loaddate 'Q') '2' 1 2) ) TO_CHAR(loaddate 'YYYY / MM') TO_CHAR(loaddate 'YYYY') ||' Q ' ||TRUNC(TO_number( TO_CHAR(loaddate 'Q')) ) TO_CHAR(loaddate 'YYYY') ||' Week'||TRUNC(TO_number( TO_CHAR(loaddate 'WW'))) TO_CHAR(loaddate 'YYYY')); If loaddate to_Date('12/31/2015' 'mm/dd/yyyy') Then Exit; End If; End Loop; file:///C|/Perl/bin/result.html (172 of 363)4/1/2009 7:50:58 PM


commit; end Insert_W_DAY_D_PR;

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172.Informatica - what is hash table informatica?


#1

uma bojja RE: what is hash table informatica? Click Here to view complete document Hash partitioning is the type of partition that is supported by Informatica where the hash user keys are specified . Can you please explain more on this?

======================================= I donot know exact answer uma but i am telling as per my knowledge.Hash table is used to extract the data through Java Virtual Machine.If u know more about this plz send to me ======================================= Hash partitions are some what similar to database partitions. This will allow user to partition the data by rage which is fetched from source. This will be handy while handling partitioned tables. --Kr

======================================= when you want the Informatica Server to distribute rows to the partitions by group. ======================================= In hash partitioning the Informatica Server uses a hash function to group rows of data among partitions. file:///C|/Perl/bin/result.html (173 of 363)4/1/2009 7:50:58 PM


The Informatica Server groups the data based on a partition key.Use hash partitioning when you want the Informatica Server to distribute rows to the partitions by group. For example you need to sort items by item ID but you do not know how many items have a particular ID number. cheers karthik

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173.Informatica - What is meant by EDW?


May 04, 2006 10:06:21 Uma Bojja


RE: What is meant by EDW? Click Here to view complete document EDW ~~~~~ Its a big data warehouses OR centralized data warehousing OR the old style of warehouse. Its a single enterprise data warehouse (EDW) with no associated data marts or operational data store (ODS) systems.

======================================= If the warehouse is build across particular vertical of the company it is called as enterprise data warehouse.It is limited to particular verticle.For example if the warehouse is build across sales vertical then it is termed as EDW for sales hierachy



======================================= EDW is Enterprise Datawarehouse which means that its a centralised DW for the whole organization. this apporach is the apporach on Imon which relies on the point of having a single warehouse/ centralised where the kimball apporach says to have seperate data marts for each vertical/department. Advantages of having a EDW: 1. Golbal view of the Data 2. Same point of source of data for all the users acroos the organization. 3. able to perform consistent analysis on a single Data Warehouse. to over come is the time it takes to develop and also the management that is required to build a centralised database. Thanks Yugandhar

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174.Informatica - how to load the data from people soft hrm to people soft erm using informatica?


May 08, 2006 14:00:35 Uma Bojja


RE: how to load the data from people soft hrm to peopl...



Click Here to view complete document Following are necessary 1.Power Connect license 2.Import the source and target from people soft using ODBC connections 3.Define connection under Application Connection Browser for the people soft source/target in workflow manager . select the proper connection (people soft with oracle sybase db2 and informix) and execute like a normal session.

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175.Informatica - what are the measure objects


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karthikeyan RE: what are the measure objects Click Here to view complete document Aggregate calculation like sum avg max min these are the measure objetcs.

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176.Informatica - what is the diff b/w STOP & ABORT in INFORMATICA sess level ?

QUESTION #176 No best answer available. Please pick the good answer available or submit your answer.



May 18, 2006 05:13:07

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rkarthikeyan RE: what is the diff b/w STOP & ABORT in INFORMATICA s... Click Here to view complete document Stop:We can Restart the session Abort:WE cant restart the session.We should truncate all the pipeline after that start the session

======================================= Stop : After issuing stop PCS processes all those records which it got from source qualifier and writes to the target. Abort: It works in the same way as stop but there is a time out period of 60sec.

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177.Informatica - what is surrogatekey ? In ur project in which situation u has used ? explain with example ?

QUESTION #177 No best answer available. Please pick the good answer available or submit your answer. May 22, 2006 09:14:55 afzal RE: what is surrogatekey ? In ur project in which situ...


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Click Here to view complete document A surrogate key is system genrated/artificial key /sequence number or A surrogate key is a substitution for the natural primary key.It is just a unique identifier or number for each row that can be used for the primary key to the table. The only requirement for a surrogate primary key is that it is unique for each row in the tableI it is useful because the natural primary key (i.e. Customer Number in Customer table) can change and this makes updates more difficult.but In my project I felt that the primary reason for the surrogate keys was to record the changing context of the dimension attributes.(particulaly for scd )The reason for them being integer and integer joins are faster. Unlike other ======================================= Surrogate key is a Unique identifier for eatch row it can be used as a primary key for DWH.The DWH does not depends on primary keys generated by OLTP systems for internally identifying the recods. When the new record is inserting into DWH primary keys are autimatically generated such type od keys are called SURROGATE KEY.Advantages1. Have a flexible mechanisam for handling S.C.D's2. we can save substantial storage space with integer valued surrogate keys. =======================================

178.Informatica - what is Partitioning ? where we can use Partition? wht is advantages?Is it nessisary?


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afzal RE: what is Partitioning ? where we can use Partition?... Click Here to view complete document The Partitioning Option increases PowerCenter’s performance through parallel data processing and this option provides a thread-based architecture and automatic data partitioning that optimizes parallel processing on multiprocessor and grid-based hardware environments. ======================================= partitions are used to optimize the session performance we can select in sesstion propetys for partiotions types default----passthrough partition



key range partion round robin partion hash partiotion

======================================= Hi In informatica we can tune performance in 5 different levels that is at source level target level mapping level session level and at network level. So to tune the performance at session level we go for partitioning and again we have 4 types of partitioning those are pass through hash round robin key range. pass through is the default one. In hash again we have 2 types that is userdefined and automatic. round robin can not be applied at source level it can be used at some transformation level key range can be applied at both source or target levels. if you want me to explain each partioning level in detail the i can .

======================================= hi nimmi please explain me regarding complete partition. I need clear picture. what tranmission it will ristrict how it will ristric where we have to give. thanks madhu.

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179.Informatica - hwo can we eliminate duplicate rows from flat file?


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Karthikeya RE: hwo can we eliminate duplicate rows from flat file... Click Here to view complete document keep aggregator between source qualifier and target and choose group by field key it will eliminate the duplicate records.

======================================= Hi Before loading to target use an aggregator transformation and make use of group by function to eleminate the duplicates on columns .Nanda ======================================= Use Sorter Transformation. When you configure the Sorter Transformation to treat output rows as distinct it configures all ports as part of the sort key. It therefore discards duplicate rows compared during the sort operation ======================================= Hi Before loading to target Use an aggregator transformation and use group by clause to eliminate the duplicate in columns.Nanda ======================================= Use sorter transformation select distinct option duplicate rows will be eliminated.

======================================= if u want to delete the duplicate rows in flat files then we go for rank transformation or oracle external procedure tranfornation select all group by ports and select one field for rank its easily dupliuctee now



Hi using Sorter Transformation we can eliminate the Duplicate Rows from Flat file Thanks N.Sai

======================================= to eliminate the duplicate in flatfiles we have distinct property in sorter transformation. If we enable that property automatically it will remove duplicate rows in flatfiles. =======================================

180.Informatica - How to Generate the Metadata Reports in Informatica?


June 01, 2006 07:27:14 balanagdara


RE: How to Generate the Metadata Reports in Informatic... Click Here to view complete document Hi Venkatesan You can generate PowerCenter Metadata Reporter from a browser on any workstation. Bala Dara

======================================= Hi You can generate PowerCenter Metadata Reporter from a browser on any workstation even a workstation that does not have PowerCenter tools installed. file:///C|/Perl/bin/result.html (181 of 363)4/1/2009 7:50:58 PM


Bala Dara

======================================= hey bala can you be more specific about that how to generate the metadata report in informantica ??? ======================================= yes we can generate reports using Metadata Reporter... It is a web based application used only for creating metadata reports in informatica. Using metadata reporter we can connect to repository and get the metadata without the knowledge of Sql and technical skills. I thik this is my answers if it is yes.... reply me.. kumar

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181.Informatica - Can u tell me how to go for SCD's and its types. Where do we use them mostly


June 08, 2006 08:53:46 priyamayee


RE: Can u tell me how to go for SCD's and its types.Wh...



Click Here to view complete document Hii It depends on the business requirement u have. We use this SCD's to maintain history(changes/ updates) in the dimensions. Each SCD type has it's own way of storing/updating/maintaining the history. For example A customer dimension is a SCD because the customer can change his/her address contact name or anything. These types of changes in dimensions are know a SCD's. And we use the 3 different SCD TYPES to handle these changes and historyu.byeMayee ======================================= The Slowly Changing Dimension problem is a common one particular to data warehousing. In a nutshell this applies to cases where the attribute for a record varies over time. We give an example below: Christina is a customer with ABC Inc. She first lived in Chicago Illinois. So the original entry in the customer lookup table has the following record: Customer Key Name State 1001 Christina IllinoisAt a later date she moved to Los Angeles California on January 2003. How should ABC Inc. now modify its customer table to reflect this change? This is the Slowly Changing Dimension problem. There are in general three ways to solve this type of problem and they are categorized as follows: In Type 1 Slowly Changing Dimension the new information simply overwrites the original information. In other words no history is kept. In our example recall we originally have the following table: Customer Key Name State 1001 Christina IllinoisAfter Christina moved from Illinois to California the new information replaces the new record and we have the following table: Customer Key Name State 1001 Christina CaliforniaAdvantages: - This is the easiest way to handle the Slowly Changing Dimension problem since there is no need to keep track of the old information. Disadvantages: - All history is lost. By applying this methodology it is not possible to trace back in history. For example in this case the company would not be able to know that Christina lived in Illinois before. Usage: About 50 of the time. When to use Type 1: Type 1 slowly changing dimension should be used when it is not necessary for the data warehouse to keep track of historical changes. In Type 2 Slowly Changing Dimension a new record is added to the table to represent the new information. Therefore both the original and the new record will be present. The new record gets its own primary key. In our example recall we originally have the following table: Customer Key Name State 1001 Christina IllinoisAfter Christina moved from Illinois to California we add the new information as a new row into the table: Customer Key Name State 1001 Christina Illinois 1005 Christina CaliforniaAdvantages: - This allows us to accurately keep all historical information. Disadvantages: - This will cause the size of the table to grow fast. In cases where the number of rows for the table is very high to start with storage and performance can become a concern. - This necessarily complicates the ETL process. Usage: About 50 of the time. When to use Type 2: Type 2 slowly changing dimension should be used when it is necessary for the data warehouse to track historical changes. In Type 3 Slowly Changing Dimension there will be two columns to indicate the particular attribute of interest one indicating the original value and one indicating the current value. There will also be a column that indicates when the current value becomes active. In our example recall we originally have the following table: Customer Key Name State1001 Christina IllinoisTo accomodate Type 3 Slowly Changing Dimension we will now have the following columns: Customer Key Name Original State Current State Effective Date After Christina moved from Illinois to California the original information gets updated and we have the following table (assuming the effective date of change is January 15 2003): Customer Key Name Original State Current State Effective Date 1001 Christina Illinois California 15-JAN-2003Advantages: - This does not increase the size of the table since new information is updated. - This allows us to keep some part of history. file:///C|/Perl/bin/result.html (183 of 363)4/1/2009 7:50:58 PM


Disadvantages: - Type 3 will not be able to keep all history where an attribute is changed more than once. For example if Christina later moves to Texas on December 15 2003 the California information will be lost. Usage: Type 3 is rarely used in actual practice. When to use Type 3: Type III slowly changing dimension should only be used when it is necessary for the data warehouse to track historical changes and when such changes will only occur for a finite number of time. =======================================

182.Informatica - How to export mappings to the production environment?

QUESTION #182 No best answer available. Please pick the good answer available or submit your answer. June 13, 2006 19:15:18

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UmaBojja RE: How to export mappings to the production environme... Click Here to view complete document In the designer go to the main menu and one can see the export/import options. Import the exported mapping in to the production repository with replace options. Thanks Uma

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183.Informatica - how u will create header and footer in target using informatica?

QUESTION #183 No best answer available. Please pick the good answer available or submit your answer. June 13, 2006 19:05:25 UmaBojja


#1


RE: how u will create header and footer in target usin... Click Here to view complete document If you are focus is about the flat files then one can set it in file properties while creating a mapping or at the session level in session properties Thanks Uma

======================================= hi uma thanks for the answer i want the complete explanation regarding to this question how to create header and footer in target?

======================================= you can always create a header and a trailer in the target file using an aggregator transformation. Take the number of records as count in the aggregator transformation. create three separate files in a single pipeline. One will be your header and other will be your trailer coming from aggregator. The third will be your main file. Concatenate the header and the main file in post session command usnig shell script.

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184.Informatica - what is the difference between constraind base load ordering and target load plan QUESTION #184




June 16, 2006 14:16:55 Uma Bojja


RE: what is the difference between constraind base loa... Click Here to view complete document Constraint based load ordering example: Table 1---Master Tabke 2---Detail If the data in table1 is dependent on the data in table2 then table2 should be loaded first.In such cases to control the load order of the tables we need some conditional loading which is nothing but constraint based load In Informatica this feature is implemented by just one check box at the session level. Thanks Uma

======================================= Target load order comes in the designer property..Click mappings tab in designer and then target load plan.It will show all the target load groups in the particular mapping. You specify the order there the server will loadto the target accordingly. A target load group is a set of source-source qulifier-transformations and target. Where as constraint based loading is a session proerty. Here the multiple targets must be generated from one source qualifier. The target tables must posess primary/foreign key relationships. So that the server loads according to the key relation irrespective of the Target load order plan.



======================================= If you have only one source it s loading into multiple target means you have to use Constraint based loading. But the target tables should have key relationships between them. If you have multiple source qualifiers it has to be loaded into multiple target you have to use Target load order.

======================================= Constraint based loading : If your mapping contains single pipeline(flow) with morethan one target (If target tables contain Master -Child relationship) you need to use constraint based load in session level. Target Load plan : If your mapping contains multipe pipeline(flow) (specify execution order one by one.example pipeline 1 need to execute first then pipeline 2 then pipeline 3) this is purly based on pipeline dependency

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185.Informatica - How do we analyse the data at database level?


June 16, 2006 14:20:55 Uma Bojja


RE: How do we analyse the data at database level?



Click Here to view complete document Data can be viewed using Informatica's designer tool. If you want to view the data on source/target we can preview the data but with some limitations. We can use data profiling too. Thanks Uma

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186.Informatica - why sorter transformation is an active transformation?


#1

Kiran Kumar Cholleti RE: why sorter transformation is an active transformat... Click Here to view complete document It allows to sort data either in ascending or descending order according to a specified field. Also used to configure for case-sensitive sorting and specify whether the output rows should be distinct. then it will not return all the rows

======================================= becz it will change the rowid of the records transformed. active transformation:is no of records and thier rowid that pass through the transformation will differ.



This is type of active transformation which is responsible for sorting the data either in the ascending order or descending order according to the key specifier. the port on which the sorting takes place is called as sortkeyport properties if u select distinct eliminate duplicates case sensitive valid for strings to sort the data null treated low null values are given least priority

======================================= If any transformation has the distinct option then it will be a active one bec active transformation is nothing but the transformation which will change the no. of o/p records.So distinct always filters the duplicate rows which inturn decrease the no of o/p records when compared to i/n records. One more thing is An active transformation can also behave like a passive

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187.Informatica - how is the union transformation active transformation?

QUESTION #187 No best answer available. Please pick the good answer available or submit your answer. June 18, 2006 09:53:25 zafar RE: how is the union transformation active transformat...


#1


Click Here to view complete document Active Transformation is one which can change the number of rows i.e input rows and output rows might not match. Number of rows coming out of Union transformation might not match the incoming rows. Zafar

======================================= Active Transformation: the transformation that change the no. of rows in the Target. Source (100 rows) ---> Active Transformation ---> Target (< or > 100 rows) Passive Transformation: the transformation that does not change the no. of rows in the Target. Source (100 rows) ---> Passive Transformation ---> Target (100 rows) Union Transformation: in Union Transformation we may combine the data from two (or) more sources. Assume Table-1 contains '10' rows and Table-2 contains '20' rows. If we combine the rows of Table-1 and Table-2 we will get a total of '30' rows in the Target. So it is definetly an Active Transformation.

======================================= thank u very munch sai venkatesh for ur answer but inthat case look up transformation should be an active transformation but it is a passive transformation . ======================================= Active transformation number of records passing through the transformation and their rowid will be different it depends on rowid also. ======================================= This is a type of passive transformation which is responsible for merging the data comming from different sources. the union transformation functions very similar to union all statement in oracle.

======================================= Hi Saivenkatesh ur answer is very nice thanking you. ======================================= Ya since the Union Trnsformation may lead a change to the no of rows incoming it is definitely an active type. file:///C|/Perl/bin/result.html (190 of 363)4/1/2009 7:50:58 PM


In the other case Look-up in no way can change the no. of row that are passing thru it. The transformation just looks to the refering table. The no. of records increases or decreases by the transformations that follow the look-up transformation.

======================================= Are you sure that Lookup is a passive trasformation

======================================= Ya Surely Lookup is a passive one ======================================= Hi u are saying source rows also 10+20 30 it passes all 30 rows to the target according to active definition while it passes the rows to the next t/r should be d/t but it passes all 30 rows. I am confusing here can anyone clear me in detail. thanks in advance =======================================

188.Informatica - what is tracing level?

QUESTION #188 No best answer available. Please pick the good answer available or submit your answer. June 21, 2006 10:47:28 rajesh RE: what is tracing level? Click Here to view complete document Tracing level determines the amount of information that informatcia server writes in a session log. ======================================= Ya its the level of information storage in session log. The option comes in the properties tab of transformations. By default it remains Normal . Can be Verbose Initialisation Verbose Data


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Normal or Terse.

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189.Informatica - How can we join 3 database like Flat File, Oracle, Db2 in Informatrica..Thanks in advance


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sandeep RE: How can we join 3 database like Flat File, Oracle,... Click Here to view complete document hi using join transformation

======================================= You have to use two joiner transformations.fIRST one will join two tables and the next one will join the third with the resultant of the first joiner. =======================================

190.Informatica - Is a fact table normalized or de-normalized? QUESTION #190 Submitted by: lakshmi Hi Dimension tables can be normalized or de-normalized. Facts are always normalized. Regards



Above answer was rated as good by the following members: Vamshidhar Click Here to view complete document Flat table is always Normalised since no redundants!! ======================================= Well!! A fact table is always DENORMALISED table. It consists of data from dimension table (Primary Key's) and Fact table has Foreign keys and measures. Thanks!!

======================================= the main funda of DW is de-normalizing the data for faster access by the reporting tool...so if ur building a DW ..90 it has to be de-normalized and off course the fact table has to be de normalized... Hope answer the question...

======================================= the fact table is always DE-NORMALIZED.somebody answered it as normalized.See if u dont know the answers plz dont post them.Just dont make lottery by posting wrong answers. ======================================= Hi I read the above comments. I confused. then we should ask Kimball know. Here is the comment.. Fable August 3 2005 Dimensional models are fully denormalized. Fact Dimensional models combine normalized and denormalized table structures. The dimension tables of descriptive information are highly denormalized with detailed and hierarchical roll-up attributes in the same table. Meanwhile the fact tables with performance metrics are typically normalized. While we advise against a fully normalized with snowflaked dimension attributes in separate tables (creating blizzard-like conditions for the business user) a single denormalized big wide table containing both metrics and descriptions in the same table is also ill-advised. Ref:http://www.kimballgroup.com/html/commentarysub2.html



======================================= Hi Dimension tables can be normalized or de-normalized. Facts are always normalized. Regards

======================================= Hi Dimension table can be normalized or de-normalized. But fact table is always normalized

======================================= Dimension table may be normalized or denormalized according to your schema but Fact table always will be denormalized. ======================================= Hi all Dimension table may be normalized or denormalized according to your schema but Fact table always will be denormalized. Regards Umesh BSIL(Mumbai)

======================================= hi please see the following site: http://72.14.253.104/search?q cache:lkFjt6EmsxMJ:www.kimballgroup.com/html/commentarysub2.



html+fact+table+normalized+or+denormalized&hl en&gl us&ct clnk&cd 1 I am highlighting what Kimball says here: Dimensional models combine normalized and denormalized table structures. The dimension tables of descriptive information are highly denormalized with detailed and hierarchical roll-up attributes in the same table. Meanwhile the fact tables with performance metrics are typically normalized. While we advise against a fully normalized with snowflaked dimension attributes in separate tables (creating blizzard-like conditions for the business user) a single denormalized big wide table containing both metrics and descriptions in the same table is also ill-advised. Regards lakshmi

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191.Informatica - What is the difference between PowerCenter 7 and PowerCenter 8?


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satish RE: What is the difference between PowerCenter 7 and P... Click Here to view complete document the major difference is in 8 version some new transformations are added apart from these the remaining same. =======================================

192.Informatica - What is the difference between PowerCenter 6 and powercenter 7?

QUESTION #192 No best answer available. Please pick the good answer available or submit your answer. June 30, 2006 10:28:09 Gopal. P


#1


RE: What is the difference between PowerCenter 6 and p... Click Here to view complete document 1)lookup the flat files in informatica 7.X but we cann't lookup flat files in informatica 6.X 2) External Stored Procedure Transformation is not available in informatica 7.X but this transformation included in informatica 6.X

======================================= Also Union Transformation is not there in 6.x where as its there in 7.x Pradeep ======================================= ● ● ● ●

Also custom transformation is not available in 6.x The main difference is the version control available in 7.x Session level error handling is available in 7.x XML enhancements for data integration in 7.x

======================================= Hi Tell me some architectural difference between the two.

======================================= in 7.x it have the more feature compare to 6.x like transaction cotrol transformation union transformation midstream XML transformation flat file lookup



custom transformation function like soundex metaphone

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193.Informatica - How to move the mapping from one database to another?

QUESTION #193 No best answer available. Please pick the good answer available or submit your answer. July 06, 2006 21:12:49

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martin RE: How to move the mapping from one database to anoth... Click Here to view complete document Do you mean migration between repositories? There are 2 ways of doing this. 1. Open the mapping you want to migrate. Go to File Menu - Select 'Export Objects' and give a name an XML file will be generated. Connect to the repository where you want to migrate and then select File Menu - 'Import Objects' and select the XML file name. 2. Connect to both the repositories. Go to the source folder and select mapping name from the object navigator and select 'copy' from 'Edit' menu. Now go to the target folder and select 'Paste' from 'Edit' menu. Be sure you open the target folder.

======================================= u can also do it this way. connect to both the repositories open the respective folders. keep the destination repository as active. from the navigator panel just drag and drop the mapping to the work area. it will ask whether to copy the mapping say YES. its done.

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if we go by the direct meaning of your question....there is no need for a new mapping for a new databse you just need to change the connections in the workflow manager to run the mapping on another database

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194.Informatica - How do we do complex mapping by using flatfiles / relational database?


#1

srinivas RE: How do we do complex mapping by using flatfiles / ... Click Here to view complete document if we are using more business reules or more transformations then it is called complex mapping. If we have flat files then we use the flat as a sourse or we can take relational sources depends on the availability.

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195.Informatica - How to define Informatica server?

QUESTION #195 No best answer available. Please pick the good answer available or submit your answer. July 06, 2006 02:45:14 deeprekha RE: How to define Informatica server?


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Click Here to view complete document informatica server is the main server component in informatica product family..Which is resonsible for reads the data from various source system and tranforms the data according to business rule and loads the data into the target table =======================================

196.Informatica - How to call stored Procedure from Workflow monitor in Informatica 7.1 version


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Prasanth RE: How to call stored Procedure from Workflow monitor... Click Here to view complete document Call stored procedure using a shell script. Invoke that shell script using command task with pmcmd.

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197.Informatica - how can we store previous session logs

QUESTION #197 No best answer available. Please pick the good answer available or submit your answer. July 12, 2006 02:54:55 Hareesh RE: how can we store previous session logs


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Click Here to view complete document Just run the session in time stamp mode then automatically session log will not overwrite current session log. Hareesh

======================================= Hi We can do this way also. using $PMSessionlogcount(specify the number of runs of the session log to save)

======================================= Hi Go to Session-->right click -->Select Edit Task then Goto -->Config Object then set the property Save Session Log By --Runs Save Session Log for These Runs --->To Number of Historical Session logs you want =======================================

198.Informatica - how can we use pmcmd command in a workflow or to run a session

QUESTION #198 No best answer available. Please pick the good answer available or submit your answer. July 14, 2006 02:31:34 abc RE: how can we use pmcmd command in a workflow or to r...


#1


Click Here to view complete document By using command task. =======================================

199.Informatica - What is change data capture?


July 14, 2006 06:26:43 Ajay RE: What is change data capture? Click Here to view complete document Change data capture (CDC) is a set of software design patterns used to determine the data that has changed in a database so that action can be taken using the changed data. ======================================= Can you eloberate on how do you this pls? =======================================

Changed Data Capture (CDC) helps identify the data in the source system that has changed since the last extraction. With CDC data extraction takes place at the same time the insert update or delete operations occur in the source tables and the change data is stored inside the database in change tables. The change data thus captured is then made available to the target systems in a controlled manner.

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200.Informatica - Wat is QTP in Data Warehousing?


November 15, 2006 00:26:44 srinuv_11 RE: Wat is QTP in Data Warehousing?


Member Since: October 2006 Contribution: 23


Click Here to view complete document I think this question is belongs to congnos. =======================================

201.Informatica - How can I get distinct values while mapping in Informatica in insertion?


#1

Manisha RE: How can I get distinct values while mapping in Inf... Click Here to view complete document You can add an aggregator before insert and group by the feilds that need to be distinct. ======================================= IN the source qualifier write the query with distinct on key column ======================================= Well There are two methods to get distinct values: If the sources are databases then we can go for SQL-override in source qualifier by changing the default SQL query. I mean selecting the check box called [] select distinct. and if the sources are heterogeneous i mean from different file systems then we can use SORTER Transformation and in transformation properties select the check box called [] select distinct same as in source qualifier we can get distinct values.

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202.Informatica - what transformation you can use inplace of lookup?



answer. July 17, 2006 05:52:56

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venkat RE: what transformation you can use inplace of lookup?... Click Here to view complete document You can use the joiner transformation by setting as outer join of either master or detail. ======================================= Hi Look-up transformation can serve in so many situations. So if you can a bit particular about the scenarioo that you are talking about it will be easy to interpret.

======================================= Hi lookup's either we can use first or last value. for suppose lookup have more than one record matching we need all matching records in that situation we can use master or detail outer join instead of lookup. (according to logic)

======================================= You can use joiner in place of lookup ======================================= You can join that table which you wanted to use in lookup in the source qualifier using SQL override to avoid using lookup transformation =======================================

203.Informatica - Why and where we are using factless fact table?

QUESTION #203 No best answer available. Please pick the good answer available or submit your answer. July 18, 2006 05:08:53 kumar


#1


RE: Why and where we are using factless fact table? Click Here to view complete document Hi Iam not sure but you can confrirm with other people. Factless fact is nothing but Non-additive measures. EX: Temperature in fact table will note it as Moderate Low High. This type of things are called Nonadditive measures. Cheers Kumar.

======================================= Factless Fact Tables are the fact tables with no facts or measures(numerical data). It contains only the foriegn keys of corresponding Dimensions.

======================================= such fact tables are required to avoid flaking of levels within dimension and to define them as a separate cube connected to the main cube. ======================================= transaction can occur without the measure then it is factless fact table or coverage table for example product samples

======================================= Fact table will contains metrics and FK's corresponding to the Dimesional table but factless Fact table will contains only FK's of corresponding dimensions without any metrics regards rma =======================================

204.Informatica - tell me one complecated mapping QUESTION #204



No best answer available. Please pick the good answer available or submit your answer. September 14, 2006 02:44:20

#1

srinivas RE: tell me one complecated mapping Click Here to view complete document if we are using more business rules or more transformations then it is a complex mapping like SCD type 2(version no effective date range flag current date)

======================================= Mapping is nothing but flow of data from source to Target we r giving instructions to power center server to move data from source to targets accourding to our business rules if more business rules r there in our mapping then its copmlex mapping.regards rma =======================================

205.Informatica - how do we do unit testing in informatica?how do we load data in informatica ?

QUESTION #205 No best answer available. Please pick the good answer available or submit your answer. July 22, 2006 04:25:39 Praveen kumar Testing


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Click Here to view complete document Unit testing are of two types 1. Quantitaive testing 2.Qualitative testing Steps. 1.First validate the mapping 2.Create session on themapping and then run workflow. Once the session is succeeded the right click on session and go for statistics tab. There you can see how many number of source rows are applied and how many number of rows loaded in to targets and how many number of rows rejected.This is called Quantitative testing. If once rows are successfully loaded then we will go for qualitative testing. Steps 1.Take the DATM(DATM means where all business rules are mentioned to the corresponding source columns) and check whether the data is loaded according to the DATM in to target table.If any data is not loaded according to the DATM then go and check in the code and rectify it. This is called Qualitative testing. This is what a devloper will do in Unit Testing.

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206.Informatica - how do we load data by using period dimension?



#1


calltomadhu


RE: how do we load data by using period dimension? Click Here to view complete document hi its very simple thourgh sheduleing thanks madhu

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207.Informatica - How many types of facts and what are they?


#1

Bala RE: How many types of facts and what are they? Click Here to view complete document I know some there are Additive Facts Semi-Additive Non-Additive Accumulating Facts Factless facts Periodic fact table Transaction Fact table. Thanks Bala

======================================= There are Factless Facts:Facts without any measures.



Additive Facts:Fact data that can be additive/aggregative. Non-Additive facts: Facts that are result of non-additon Semi-Additive Facts: Only few colums data can be added. Periodic Facts: That stores only one row per transaction that happend over a period of time. Accumulating Fact: stores row for entire lifetime of event. There must be some more if some one knows pls add.

======================================= hi there are 3 types additive semi additive non additive thanks madhu

======================================= hai there r three types of facts Additive Fact-Fact which is used across all dimensions semi Additive Fact- Fact which is used some dimesion and not with some Non Additive Fact- Fact which is not used any of the dimesion

======================================= 1. Regular Fact - With numeric values 2.Factless Fact - Without numeric values file:///C|/Perl/bin/result.html (208 of 363)4/1/2009 7:50:58 PM


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208.Informatica - How can you say that union Transormation is Active transformation.


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kirankumarvema RE: How can you say that union Transormation is Active... Click Here to view complete document By using union transformation we can eleminate some rows....so this is active transformation.bye ======================================= Pls explain more. we are doing the union.how the union is eliminating the some rows. ======================================= By Definiation Active transformation is the transformation that changes the number of rows that pass through it...in union transformation the number of rows resulting from union can be (are) different from the actual number of rows. ======================================= union is active becoz it eliminates duplicates from the sources ======================================= Heloo Msr your answer is wrong.Union is not eliminating the duplicate rows.If anybody knows please give me reason. All are giving the above answers are not supporting that question.Don't give the active transofrmation defination.I want exact reasons. ======================================= hi We can merge multiple source qualier query records in union trans at same time its not like expresion trans (each row). so we can say it is active.

======================================= Hi Union Transformation is a active transformation because it changes the number of rows through the pipeline.



It normally has multiple input groups to add on it compare to other transformation.Before union transformation was implement the funda on number of rows was right i.e before 7.0 but now its not the exact benchmark to determine the active transformation Thanks Uma

======================================= Hi Union also Active tranformation.because it eliminates duplicate rows When you select distinct option in union properties tab.

======================================= Hi all some people saying that a union T/R eliminates duplicates. but it is woring . As of now it wont eliminate duplicates. The union T/R is active and also passive depends upon the property "is active" which is present at union T/R properties tab. this Specifies whether this transformation is an active or a passive transformation. When you enable this option the transformation can generate 0 1 or more output rows for each input row. Otherwise it can generate only 0 or 1 output row for each input row. but this property is disabled in informatica 7.1.1. I think it may developed in future. regards kiran =======================================

209.Informatica - how many types of dimensions are available in informatica?


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July 31, 2006 00:18:27 hello RE: how many types of dimensions are available in info... Click Here to view complete document three types of dimensions are available ======================================= What are they?Plz explain me.What is rapidly changing dimensions? ======================================= no ======================================= hi there r 3 types of dimensions 1.star schema 2.snowflake schema 3.glaxy schema

======================================= i think there r 3 types of dimension table 1.stand-alone 2 local. 3.global

======================================= There are 3 types of dimensions available according to my knowledge. That are 1. General dimensions file:///C|/Perl/bin/result.html (211 of 363)4/1/2009 7:50:58 PM

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2. Confirmed dimensions 3. Junk Dimensions

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Using the Slowly Changing Dimensions Wizard The Slowly Changing Dimensions Wizard creates mappings to load slowly changing dimension tables: ●

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Type 1 Dimension mapping. Loads a slowly changing dimension table by inserting new dimensions and overwriting existing dimensions. Use this mapping when you do not want a history of previous dimension data. Type 2 Dimension/Version Data mapping. Loads a slowly changing dimension table by inserting new and changed dimensions using a version number and incremented primary key to track changes. Use this mapping when you want to keep a full history of dimension data and to track the progression of changes. Type 2 Dimension/Flag Current mapping. Loads a slowly changing dimension table by inserting new and changed dimensions using a flag to mark current dimension data and an incremented primary key to track changes. Use this mapping when you want to keep a full history of dimension data tracking the progression of changes while flagging only the current dimension. Type 2 Dimension/Effective Date Range mapping. Loads a slowly changing dimension table by inserting new and changed dimensions using a date range to define current dimension data. Use this mapping when you want to keep a full history of dimension data tracking changes with an exact effective date range. Type 3 Dimension mapping. Loads a slowly changing dimension table by inserting new dimensions and updating values in existing dimensions. Use this mapping when you want to keep the current and previous dimension values in your dimension table.

======================================= I want each and every one of you who is answering please don't make fun out of this. some one gave the answer no . some one gave the answer star flake schema snow flake schema etc how can a schema come under a type of dimension ANSWER:



One major classification we use in our real time modelling is Slowly Changing Dimensions type1 SCD: If you want to load an updated row of previously existed row the previous data will be replaced. So we lose historical data. type2 SCD: Here we will add a new row for updated data. So we have both current and past records which aggrees with the concept of datawarehousing maintaining historical data. type3 SCD: Here we will add new columns. but mostly used one is type2 SCD. we have one more type of dimension that is CONFORMED DIMENSION: The dimension which gives the same meaning across different star schemas is called Conformed dimension. ex: Time dimension. where ever it was gives the same meaning

======================================= wat r those three dimensions tht r available in inforamtica here we get multiple answers cud anyone tell me the exact once......... thq hari krishna

======================================= casual dimension confimed dimension degenrate dim junk dimension raged dim dirty dim =======================================

210.Informatica - How can you improve the performance of Aggregate transformation?



August 06, 2006 06:20:23

#1

shanthi RE: How can you improve the performance of Aggregate t... Click Here to view complete document By using sorter transformation before the aggregator transformation.

======================================= by using sorted input ======================================= hi we can improve the agrregator performence in the following ways 1.send sorted input. 2.increase aggregator cache size.i.e Index cache and data cache. 3.Give input/output what you need in the transformation.i.e reduce number of input and output ports.

======================================= IN Aggregator transformations select the sorted input check list in the properties tab and write sql query in source qulifier.Its improoves the performance. ======================================= Hi we can improve the aggrifation performance by doing like this. create group by condition only on numaric columns. use sorter transimition before aggregator give sorter input to aggreator.



increate the cashe size of aggreator.

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211.Informatica - Why did you use stored procedure in your ETL Application?

QUESTION #211 No best answer available. Please pick the good answer available or submit your answer. August 11, 2006 13:16:09 sudha RE: Why did you use stored procedure in your ETL Appli... Click Here to view complete document hi usage of stored procedure has the following advantages 1checks the status of the target database 2drops and recreates indexes 3determines if enough space exists in the database 4performs aspecilized calculation

======================================= Stored procedure in Informatica will be useful to impose complex business rules.

======================================= to execute database procedures ======================================= Hi file:///C|/Perl/bin/result.html (215 of 363)4/1/2009 7:50:58 PM

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Using of stored procedures plays important role.Suppose ur using oracle database where ur doing some ETL changes you may use informatica .In this every row of the table pass should pass through informatica and it should undergo specified ETL changes mentioned in transformations. If use stored procedure i..e..oracle pl/sql package this will run on oracle database(which is the databse where we need to do changes) and it will be faster comapring to informatica because it is runing on the oracle databse.Some things which we cant do using tools we can do using packages.Some jobs make take hours to run ........in order to save time and database usage we can go for stored procedures.

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212.Informatica - why did u use update stategy in your application?


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angeletteeye RE: why did u use update stategy in your application? Click Here to view complete document Update Strategy is used to drive the data to be Inert Update and Delete depending upon some condition. You can do this on session level tooo but there you cannot define any condition.For eg: If you want to do update and insert in one mapping...you will create two flows and will make one as insert and one as update depending upon some condition.Refer : Update Strategy in Transformation Guide for more information ======================================= Update Strategy is the most important transformation of all Informatica transformations. The basic thing one should understand about this is it is essential transformation to perform DML operations on already data populated targets(i.e targets which contain some records before this mapping loads data) It is used to perform DML operations. Insertion Updation Deletion Rejection when records come to this transformation depending on our requirement we can decide whether to file:///C|/Perl/bin/result.html (216 of 363)4/1/2009 7:50:58 PM


insert or update or reject the rows flowing in the mapping. For example take an input row if it is already there in the target(we find this by lookup transformation) update it otherwise insert it. We can also specify some conditions based on which we can derive which update strategy we have to use. eg: iif(condition DD_INSERT DD_UPDATE) if condition satisfies do DD_INSERT otherwise do DD_UPDATE DD_INSERT DD_UPDATE DD_DELETE DD_REJECT are called as decode options which can perform the respective DML operations. There is a function called DECODE to which we can arguments as 0 1 2 3 DECODE(0) DECODE(1) DECODE(2) DECODE(3) for insertion updation deletion and rejection

======================================= Update Strategy is the most important transformation of all Informatica transformations. The basic thing one should understand about this is it is essential transformation to perform DML operations on already data populated targets(i.e targets which contain some records before this mapping loads data) It is used to perform DML operations. Insertion Updation Deletion Rejection when records come to this transformation depending on our requirement we can decide whether to insert or update or reject the rows flowing in the mapping. For example take an input row if it is already there in the target(we find this by lookup transformation) update it otherwise insert it. We can also specify some conditions based on which we can derive which update strategy we have to use.



eg: iif(condition DD_INSERT DD_UPDATE) if condition satisfies do DD_INSERT otherwise do DD_UPDATE DD_INSERT DD_UPDATE DD_DELETE DD_REJECT are called as decode options which can perform the respective DML operations. There is a function called DECODE to which we can arguments as 0 1 2 3 DECODE(0) DECODE(1) DECODE(2) DECODE(3) for insertion updation deletion and rejection

======================================= to perform dml operations thanks madhu

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213.Informatica - How do you create single lookup transformation using multiple tables? QUESTION #213 No best answer available. Please pick the good answer available or submit your answer. August 10, 2006 16:46:28 Srinivas RE: How do you create single lookup transformation usi...


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Click Here to view complete document Write a override sql query. Adjust the ports as per the sql query. ======================================= no it is not possible to create single lookup on multiple tables. beacuse lookup is created upon target table. ======================================= for connected lkp transformation1>create the lkp transformation.2>go for skip.3>manually enter the ports name that u want to lookup.4>connect with the i/p port from src table.5>give the condition6>go for generate sql then modify according to u'r requirement validateit will work.... ======================================= just we can create the view by using two table then we can take that view as lookup table

======================================= If you want single lookup values to be used in multiple target tables this can be done !!! For this we can use Unconnected lookup and can collect the values from source table in any target table depending upon the business rule ...

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214.Informatica - In update strategy target table or flat file which gives more performance ? why?

QUESTION #214 No best answer available. Please pick the good answer available or submit your answer. August 10, 2006 04:10:37 prasad.yandapalli stored procedure


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Click Here to view complete document we use stored procedure for populating and maintaing databases in our mapping ======================================= Pros: Loading Sorting Merging operations will be faster as there is no index concept and Data will be in ASCII mode. Cons: There is no concept of updating existing records in flat file. As there is no indexes while lookups speed will be lesser.

======================================= hi faltfile give more performance. beacause there is no index cosept and there is no constraints

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215.Informatica - How to load time dimension?

QUESTION #215 No best answer available. Please pick the good answer available or submit your answer. August 15, 2006 04:08:18 Mahesh RE: How to load time dimension?


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Click Here to view complete document We can use SCD Type 1/2/3 to load any Dimensions based on the requirement. ======================================= We can use SCD Type 1/2/3 to load data into any dimension tables as per the requirement. ======================================= U can load time dimension manually by writing scripts in PL/SQL to load the time dimension table with values for a period. Ex:- M having my business data for 5 years from 2000 to 2004 then load all the date starting from 1-12000 to 31-12-2004 its around 1825 records. Which u can do it fast writing scripts. Bhargav

======================================= hi thourgh type1 type2 type3 depending upon the codition thanks madhu

======================================= For loading data in to other dimensions we have respective tables in the oltp systems.. But for time dimension we have only one base in the OLTP database. Based on that we have to load time dimension. We can loan the time dimension using ETL procedures which calls the procedure or function created in the database. If the columns are more in the time dimension we have to creat it manually by using Excel sheet.

======================================= create a procedure to load data into Time Dimension. The procedure needs to run only once to popullate all the data. For eg the code below fills up till 2015. You can modify the code to suit the feilds in ur table.



create or replace procedure QISODS.Insert_W_DAY_D_PR as LastSeqID number default 0; loaddate Date default to_date('12/31/1979' 'mm/dd/yyyy'); begin Loop LastSeqID : LastSeqID + 1; loaddate : loaddate + 1; INSERT into QISODS.W_DAY_D values( LastSeqID Trunc(loaddate) Decode(TO_CHAR(loaddate 'Q') '1' 1 decode(to_char(loaddate 'Q') '2' 1 2) ) TO_FLOAT(TO_CHAR(loaddate 'MM')) TO_FLOAT(TO_CHAR(loaddate 'Q')) trunc((ROUND(TO_DECIMAL(to_char(loaddate 'DDD'))) + ROUND(TO_DECIMAL(to_char(trunc(loaddate 'YYYY') 'D')))+ 5) / 7) TO_FLOAT(TO_CHAR(loaddate 'YYYY')) TO_FLOAT(TO_CHAR(loaddate 'DD')) TO_FLOAT(TO_CHAR(loaddate 'D')) TO_FLOAT(TO_CHAR(loaddate 'DDD')) 1 1 1 1 1 TO_FLOAT(TO_CHAR(loaddate 'J')) ((TO_FLOAT(TO_CHAR(loaddate 'YYYY')) + 4713) * 12) + TO_number(TO_CHAR(loaddate 'MM')) ((TO_FLOAT(TO_CHAR(loaddate 'YYYY')) + 4713) * 4) + TO_number(TO_CHAR(loaddate 'Q')) TO_FLOAT(TO_CHAR(loaddate 'J'))/7 TO_FLOAT (TO_CHAR (loaddate 'YYYY')) + 4713 TO_CHAR(load_date 'Day') TO_CHAR(loaddate 'Month') Decode(To_Char(loaddate 'D') '7' 'weekend' '6' 'weekend' 'weekday') Trunc(loaddate 'DAY') + 1 Decode(Last_Day(loaddate) loaddate 'y' 'n') to_char(loaddate 'YYYYMM') to_char(loaddate 'YYYY') || ' Half' || Decode(TO_CHAR(loaddate 'Q') '1' 1 decode(to_char(loaddate 'Q') '2' 1 2) ) TO_CHAR(loaddate 'YYYY / MM') TO_CHAR(loaddate 'YYYY') ||' Q ' ||TRUNC(TO_number( TO_CHAR(loaddate file:///C|/Perl/bin/result.html (222 of 363)4/1/2009 7:50:58 PM


'Q')) ) TO_CHAR(loaddate 'YYYY') ||' Week'||TRUNC(TO_number( TO_CHAR(loaddate 'WW'))) TO_CHAR(loaddate 'YYYY')); If loaddate to_Date('12/31/2015' 'mm/dd/yyyy') Then Exit; End If; End Loop; commit; end Insert_W_DAY_D_PR;

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216.Informatica - what is the architecture of any Data warehousing project? what is the flow?


August 21, 2006 06:52:22 satyaneerumalla

Member Since: August 2006 Contribution: 16

RE: what is the architecture of any Data warehousing p... Click Here to view complete document 1)The basic step of datawarehousing starts with datamodelling. i.e creation dimensions and facts. 2)datawarehouse starts with collection of data from source systems such as OLTP CRM ERPs etc 3)Cleansing and transformation process is done with ETL(Extraction Transformation Loading) tool. 4)by the end of ETL process target databases(dimensions facts) are ready with data which accomplishes the business rules. 5)Now finally with the use of Reporting tools(OLAP) we can get the information which is used for decision support.

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very nice answer thanks

======================================= nice answer i have more doubts and can u give me ur mail id =======================================

217.Informatica - What are the questions asked in PDM Round (Final Hr round)


November 14, 2006 02:08:00 srinuv_11


RE: What are the questions asked in PDM Round(Final Hr... Click Here to view complete document We can't say which questions asking in which round that will depending on the interviewer. In Hr round they will ask what about ur current company tell some thing about ur company and why ur preffering this company and tell me some thing my company this they will ask any type of question. These are the sample questions. =======================================

218.Informatica - What is the difference between materialized view and a data mart? Are they same?




RE: What is the difference between materialized view a...



Click Here to view complete document Hi friend please elaborate what do you mean by materialized view. Then i think i can help you to clear your doubt. mail me at [email protected]

======================================= A materialized view provides indirect access to table data by storing the results of a query in a separate schema object unlike an ordinary view which does not take up any storage space or contain data. Materialized views are schema objects that can be used to summarize precompute replicate and distribute data. E.g. to construct a data warehouse.

The definition of materialized view is very near to the concept of Cubes where we keep summarized data. But cubes occupy space. Coming to datamart that is completely different concept. Datawarehouse contains overall view of the organization. But datamart is specific to a subjectarea like Finance etc... we can combine different data marts of a compnay to form datawarehouse or we can split a datawarehouse into different data marts.

======================================= hi view direct connect to table it wont contain data and what we ask it will fire on table and give the data. ex: sum(sal). materilized view are indirect connect to data and stored in separte scheema. it is just like cube in dw. it will have data. what ever we ask summerised information it will give and stores it. when ever we ask



next time it will directly from here itself. performance wise this view are faster than normal view.

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219.Informatica - In workflow can we send multiple email ?


August 28, 2006 15:13:20 prudhvi RE: In workflow can we send multiple email ? Click Here to view complete document yes we can send multiple e-mail in a workflow

======================================= Yes only on the UNIX version of Workflow and not Windows based version. =======================================

220.Informatica - How do we load from PL/SQL script into Informatica mapping?




RE: How do we load from PL/SQL script into Informati...



Click Here to view complete document You can use StoredProcedure transformation. There you can specify the pl/sql procedure name. when we run the session containing this transformation the pl/sql procedure will get executed. If you want more clarification. Either elaborate your question or mail me at [email protected]

======================================= hi for database procedure we have procedure transmission. we can use that one. thanks madhu

======================================= You can actually create a view and import it as source in mapping ....

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221.Informatica - can any one tell why we are populating time dimension only with scripts not with mapping?


September 23, 2006 07:07:31 calltomadhu




RE: can any one tell why we are populating time dimens... Click Here to view complete document hi becuase time dimension is rapidly changing dimenction. if you use mapping it is very big stuff and that to be it very big problem in performence wise. thanks madhu

======================================= How can time dimension be a rapidly chnging dimensions. Time dimension is one table where you load date and time related information so that the key can be used in facts. this way you dont have to use entire date in the fact and can rather use the time key. there are a number of advantages in performance and simplicity of design with this strategy. You use a script to laod time dimension becuase you load it one time. as i said earlier all it contains are dates starting from one point of time say... 01/01/1800 to some date in future say 01/01/3001 =======================================

222.Informatica - What about rapidly changing dimensions?Can u analyze with an example? QUESTION #222 No best answer available. Please pick the good answer available or submit your answer. #1

September 04, 2006 09:05:10 satyaneerumalla


RE: What about rapidly changing dimensions?Can u analy...



Click Here to view complete document hi a rapidly changing dimensions are those in which values are changing continuously and giving lot of difficulty to maintain them. i am giving one of the best real world example which i found in some website while browsing. go through it. i am sure you like it. description of a rapidly changing dimension by that person: I'm trying to model a retailing case . I'm having a SKU dimension of around 150 000 unique products which is already a SCD Type 2 for some attributes. In addition I'm willing to track changes of the sales and purchase price. However these prices change almost daily for quite a lot of these products leading to a huge dimensional table and requiring continuous updations. so a better option would be shift those attributes into a fact table as facts which solves the problem.

======================================= hi If you dont mine plz tell me how to creat rapidly changing dimensinons. and one more question.... please tell me what is the use of custom transformation.. thanking u.bye. ======================================= Rapidly changing dimension is that whre the dimensions changes quikly. best example is ATM transactions(BANKS).The data being changes continuesly and concurently for each second so it is very difficult to capture this dimensions.

======================================= hi question itself there that data is quite freequently changing. Changing means it can be modify or added. Example. The best example of this one is Sales Table.



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223.Informatica - What are Data driven Sessions?

QUESTION #223 The informatica server follows instructions coded into update strategy transformations with in the session mapping to determine how to flag records for insert,update,delete or reject. If you do not choose data driven optionn setting, the informatica server ignores all update strategy transformations in the mapping Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 07, 2006 07:38:33

#1

fazal RE: What are Data driven Sessions?

======================================= Once you load the data in your DW you can update the new data with the following options in your session properties:1.update 2.insert2.delete and datadriven and all these options are present in your session properties now if you select the datadriven option informatica takes the logic to update delete or reject data from your designer update strategy transformation.it will look some thing like this IIF( JOB 'MANAGER' DD_DELETE DD_INSERT ) this expression marks jobs with an ID of manager for deletion and all other items for insertion. Hope answer the question.

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224.Informatica - what are the transformations that restrict the partitioning of sessions?

QUESTION #224 *Advanced External procedure transformation and External procedure transformation: This Transformation contains a check box on the properties tab to allow partitioning. file:///C|/Perl/bin/result.html (230 of 363)4/1/2009 7:50:58 PM


*Aggregator Transformation: If you use sorted ports you cannot partition the associated source *Joiner Transformation: you can not partition the master source for a joiner transformation *Normalizer Transformation *XML targets. Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. September 07, 2006 14:32:12

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Manasa RE: what are the transformations that restrict the par...

======================================= 1)source defination 2)Sequence Generator 3)Unconnected Transformation 4)Xml Target defination ======================================= Advanced External procedure transformation and External procedure transformation: This Transformation contains a check box on the properties tab to allow partitioning. Aggregator Transformation: If you use sorted ports you cannot partition the associated source Joiner Transformation: you can not partition the master source for a joiner transformation Normalizer Transformation XML targets. =======================================

225.Informatica - Wht is incremental loading?Wht is versioning in 7.1? QUESTION #225 No best answer available. Please pick the good answer available or submit your answer.



September 11, 2006 11:06:34

#1

Anuj Agarwal RE: Wht is incremental loading?Wht is versioning in 7.... Click Here to view complete document Incremental loading in DWH means to load only the changed and new records.i.e. not to load the ASIS records which already exist. Versioning in Informatica 7.1 is like a confugration management system where you have every version of the mapping you ever worked upon. Whenever you have checkedin and created a lock noone else can work on the same mapping version. This is very helpful in n environment where you have several users working on a single feature.

======================================= Hi The Type 2 Dimension/Version Data mapping filters source rows based on user-defined comparisons and inserts both new and changed dimensions into the target. Changes are tracked in the target table by versioning the primary key and creating a version number for each dimension in the table. In the Type 2 Dimension/Version Data target the current version of a dimension has the highest version number and the highest incremented primary key of the dimension. Use the Type 2 Dimension/Version Data mapping to update a slowly changing dimension table when you want to keep a full history of dimension data in the table. Version numbers and versioned primary keys track the order of changes to each dimension. Shivaji Thaneru

======================================= Hi Please see the incremental loding answer in CDC. Now i will tell you about versioning. Simply if any body is working in Programming language then it is SOS. Means source of site. Means



where the hystory of data will be available. If any body dont know about this consept read the below. See i developed some software in one storing area. After that some enhancement is happend then i will download the data i will do the modification and keep that in same area but with some othere file name. If at all anothere developer wants this one simply he will download this data and he will modify or add again he will keep that source code in that same place but with other filename. so like this hystory will be maintained. If we found there is bug in previous version. so what we will do simply we will revert back the changes bye downloading the source . thanks madhu

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226.Informatica - What is ODS ?what data loaded from it ? What is DW architecture?

QUESTION #226 No best answer available. Please pick the good answer available or submit your answer. September 11, 2006 10:58:25 A Agarwal RE: Wht is ODS ?wht data loaded from it ?Wht is DW ar... Click Here to view complete document ODS--Operational Data Source Normally in 3NF form. Data is stored with least redundancy. General architecture of DWH OLTP System--> ODS ---> DWH( Denomalised Star or Snowflake vary case to case)

======================================= This consept is really good. I will tell u clearly. file:///C|/Perl/bin/result.html (233 of 363)4/1/2009 7:50:58 PM

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Assume that i have one 24/7 company. Peak hours is 9-9. ok in this one per day around 40000 records are added or modified. Now at 9'o clock i had taken a backup and left. after 9 to 9 again instead of stroing the data in the same server i will keep from 9 p.m to 9 a.m. data i will store saperatly. Assume that 10000 records are added in this time. so that next day moring when i am dumping the data there is no need to take 40000+10000. It is very slow in performance wise. so i can take directly 10000 records. this consepct what we call as ODS. Operational Data Source. Arch can be in two ways. ODS to WH ODS StagingArea wh Thanks & regards madhu

======================================= ODS is an Integrated view of Operational sources(OLTP). ======================================= thq from ur answer i can come to one conclusion tht ODS is used to store the current data. i can assume tht by defalut it will add tht 40000 records to this current data 10000 records n gives the reslut 50000. cud u plz reply to this...... thq...

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227.Informatica - what are the type costing functions in informatica



#1


calltomadhu


RE: what are the type costing functions in informatica... Click Here to view complete document question was not clear can u repeat this question with full descritpion because there is no specific costing functions in informatica. thanks madhu.

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228.Informatica - what is the repository agent?


September 12, 2006 11:07:42 Shivat


RE: what is the repository agent? Click Here to view complete document Hi The Repository Agent is a multi-threaded process that fetches inserts and updates metadata in the repository database tables. The Repository Agent uses object locking to ensure the consistency of metadata in the repository. ShivajiThaneru

======================================= Hi



The Repository Server uses a process called Repository agent to access the tables from Repository database.The Repository sever uses multiple repository agent processes to manage multiple repositories on different machines on the network using native drivers.

======================================= Hi The Repository Server uses a process called Repository agent to access the tables from Repository database.The Repository sever uses multiple repository agent processes to manage multiple repositories on different machines on the network using native drivers. chsrgeekI

======================================= Hi Name itself it is saying that agent means meadiator between and repositary server and reposatary database tables. simply reposatary agent means who speaks with reposatary. thanks madhu

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229.Informatica - what is the basic language of informatica?

QUESTION #229 No best answer available. Please pick the good answer available or submit your answer. September 15, 2006 14:38:58 vick RE: what is the basic language of informatica?


#1


Click Here to view complete document Sql plus ======================================= Hi basic language is Latin. and it was developed in VC++. Thanks & Regards Madhu D.

======================================= The basic language of Informatica is SQL plus.Then only it will under stand the data base language. =======================================

230.Informatica - What is CDC?




RE: Wht is CDC? Click Here to view complete document Changed Data Capture (CDC) helps identify the data in the source system that has changed since the last extraction. With CDC data extraction takes place at the same time the insert update or delete operations occur in the source tables and the change data is stored inside the database in change tables. The change data thus captured is then made available to the target systems in a controlled manner. mail me to discuss any thing related to informatica. it's my pleasure to discuss. [email protected]



======================================= CDC Changed Data Capture. Name itself saying that if any data is changed it will how to get the values. for this one we have type1 and type2 and type3 cdc's are there. depending upon our requirement we can fallow. thanks madhu

======================================= Whenever any source data is changed we need to capture it in the target system also this can be basically in 3 ways Target record is completely replaced with new record(Type 1) Complete changes can be captured as different records & stored in the target table(Type 2) Only last change & present data can be captured (Type 3) CDC can be done generally by using a timestamp or version key

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231.Informatica - what r the mapping specifications? how versionzing of repository objects?




RE: what r the mapping specifications? how versionzing...



Click Here to view complete document Mapping Specification It is a metadata document of a mapping. A typical Mapping specification contains: 1.Mapping Name 2.Business Requirement Information 3.Source System Initial Rows Short Description Refresh Frequency Preprocessing Post Processing Error Strategy Reload Strategy Unique Source Fields 4.Target System Rows/Load

5.Sources Tables Table Name Schema/Owner Selection/Filter Files File Name File Owner Unique Key

6.Targets



Information about different targets. Some thing like above one. 7.Information about lookups 8.Source To Target Field Matrix Target Table Target Column Data-type Source Table Source Column Data-type Expression Default Value if Null Data Issues/Quality/Comments

Coming to Versioning of objects in repository... In this we have to things 1.Checkout: when some user is modifying an object(source target mapping) he can checkout it. That is he can lock it. So that until he release no body can access it. 2.Checkin: When you want to commit an object u use this checkin feature.

======================================= Mapping Specification It is a metadata document of a mapping. A typical Mapping specification contains: 1.Mapping Name 2.Business Requirement Information 3.Source System Initial Rows Short Description Refresh Frequency Preprocessing Post Processing file:///C|/Perl/bin/result.html (240 of 363)4/1/2009 7:50:58 PM


Error Strategy Reload Strategy Unique Source Fields 4.Target System Rows/Load

5.Sources Tables Table Name Schema/Owner Selection/Filter Files File Name File Owner Unique Key

6.Targets Information about different targets. Some thing like above one. 7.Information about lookups 8.Source To Target Field Matrix Target Table Target Column Data-type Source Table Source Column Data-type Expression Default Value if Null Data Issues/Quality/Comments

Coming to Versioning of objects in repository... In this we have to things 1.Checkout: when some user is modifying an object(source target mapping) he can checkout it. That is he can lock it. So that until he release no body can access it.



2.Checkin: When you want to commit an object u use this checkin feature.

======================================= Please let me know the answer for this question. ======================================= hi mapping is nothing but flow or work. where the data is coming and where data is going. for this we need mapping name source table target table session. thanks madhu

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232.Informatica - what is bottleneck in informatica?


September 26, 2006 09:46:17 opbang RE: what is bottleneck in informatica?




Click Here to view complete document Bottleneck in Informatica Bottleneck in ETL Processing is the point by which the performance of the ETL Process is slowr. When ETL Process is in progress first thing login to workflow monitor and observe performance statistic. I.e. observe processing rows per second. In SSIS and Datastage when you run the job you can see at every level how many rows per second is processed by the server. Mostly bottleneck occurs at source qualifier during fetching data from source joiner aggregator Lookup Cache Building Session. Removing bottleneck is performance tuning.

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233.Informatica - What is the differance between Local and Global repositary?


September 26, 2006 09:55:03 opbang


RE: What is the differance between Local and Global re... Click Here to view complete document You can develop global and local repositories to share metadata: ●

●

Global repository. The global repository is the hub of the domain. Use the global repository to store common objects that multiple developers can use through shortcuts. These objects may include operational or Application source definitions reusable transformations mapplets and mappings. Local repositories. A local repository is within a domain that is not the global repository. Use local repositories for development. From a local repository you can create shortcuts to objects in shared folders in the global repository. These objects typically include source definitions common dimensions and lookups and enterprise standard transformations. You can also create



copies of objects in non-shared folders.

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234.Informatica - Explain in detail about Key Range & Round Robin partition with an example.


#1

srinivas vadlakonda RE: Explain in detail about Key Range & Round Robin pa... Click Here to view complete document key range: The informatica server distributes the rows of data based on the st of ports that u specify as the partition key. Round robin: The informatica server distributes the equal no of rows for each and every partition.

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235.Informatica - COMMITS: What is the use of Source-based commits ? PLease tell with an example ?

QUESTION #235 No best answer available. Please pick the good answer available or submit your answer. September 29, 2006 02:20:42 srinivas vadlakonda RE: COMMITS: What is the use of Source-based commits ?...


#1


Click Here to view complete document commits the data based on the course records ======================================= if you selected commit type is target once the cache is holding some 10000 records server will commit the records here server will be least bother of the number of source records processed. if you selected commit type is source once after 10000 records are queried immedialty server will commit that here server will be least bother how many records inserted in the target.

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236.Informatica - What Bulk & Normal load? Where we use Bulk and where Normal?


#1

Vamsi Krishna.K RE: What Bulk & Normal load? Where we use Bulk and whe... Click Here to view complete document Hello when we try to load data in bulk mode there will be no entry in database log files so it will be tough to recover data if session got failed at some point. where as in case of normal mode entry of every record will be with database log file and with the informatica repository. so if the session got failed it will be easy for us to start data from last committed point. Bulk mode is very fast compartively with normal mode. we use bulk mode to load data in databases it won't work with text files using as target where as normal mode will work fine with all type of targets.

=======================================



in case of bulk for group of records a dml statement will created and executed but in the case of normal for every recorda a dml statement will created and executed if u selecting bulk performance will be increasing

======================================= Bulk mode is used for Oracle/SQLserver/Sybase. This mode improves performance by not writing to the database log. As a result when using this mode recovery is unavailable. Further this mode doesn't work when update transformation is used and there shouldn't be any indexes or constraints on the table. Ofcourse one can use the pre-session and post-session SQLs to drop and rebuild indexes/constraints. =======================================

237.Informatica - Which transformation has the most complexity Lookup or Joiner?


#1

srinivas vadlakonda RE: Which transformation has the most complexity Looku... Click Here to view complete document lookup trans is check the condition like joiner but it has the more feature like get a related value update slowly chaning dimention

======================================= lookupbut it will reduse the complexity of the solutions and improves the performance of the workflows. =======================================

238.Informatica - Where we use Star Schema & where Snowflake? QUESTION #238 No best answer available. Please pick the good answer available or submit your file:///C|/Perl/bin/result.html (246 of 363)4/1/2009 7:50:58 PM


answer. October 05, 2006 01:20:33

#1

Raj RE: Where we use Star Schema & where Snowflake? Click Here to view complete document its depends for client requirements.initially we have implement high level design .so the client want to be normalized (snow flake schema) or de-normaliized data (star schema) which is used for their analysis.so we have implemented whatever their requirements

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239.Informatica - Can we create duplicate rows in star schema?


#1

Ashwani RE: Can we create duplicate rows in star schema? Click Here to view complete document Duplicate row has nothing to do with StarSchema. StarSchema is mathodoly and Duplicate row is part of actual implementation in DB. If u look at Surrogate key conceot then NO beside surrogate key other columns can be duplicate...and in that case there is another special case if you implemented Unique inDex...Boom =======================================

240.Informatica - Where persistent cache will be stored?

QUESTION #240 No best answer available. Please pick the good answer available or submit your answer. October 01, 2006 10:04:07 Vamsi Krishna.K


#1


RE: Where persistent cache will be stored? Click Here to view complete document The informatica server saves the cache files for every session and reuses it for next session by that the query on the table will be reduced so that there will be some performance increment will be there. ======================================= presistent cache stored in the server folder =======================================

241.Informatica - What is SQL override? In which transformation we use override?


#1

Vamsi Krishna.K RE: What is SQL override? In which transformation we u... Click Here to view complete document Hello By default informatica server will generate sql query for every action if that query is not able to perform the exact task we can modify that query or we can genrate new once with new conditions and with new constraints. 1. source qualifier 2. lookup 3. target

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242.Informatica - Can you update the Target table?



answer. #1

October 01, 2006 09:55:26 Vamsi Krishna.K RE: Can you update the Target table? Click Here to view complete document hello

we have to update target table. if you are loading type-1 dimension type-2 dimension data at target surly you have to do. this update can be done by two type. 1. using update stratergy 2. target update override. Thanks vamsi.

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243.Informatica - At what frequent u load the data?


October 04, 2006 01:39:58 opbang RE: At what frequent u load the data?




Click Here to view complete document Loading frequency depends on the requirement of Business Users It could be daily during mid night... or weekly... Depending on the frequency... ETL process should take care... how the updated transaction data will replace in fact tables... Other factors How fast OLTP is updating Data Volume Available time window for Extracting Data.

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244.Informatica - What is a Materialized view? Diff. Between Materialized view and view


#1

srinivas.vadlakonda RE: What is a Materialized view? Diff. Between Materia... Click Here to view complete document materialized views are used in datawarehousing to precompute and store aggregated data such sum of sales and it will used for increase the speed of the query when we are taking the large data bases. view nothing but it is a small table which meats our criteria it will not occupy the space

======================================= View doesn't occupy any storage space in table space but meterilized view will occupy space ======================================= Materialized view stores the result set of a query but normal view does not store the same. We can refresh the Materialised View when any changes are made in the master table. Normal view is only for view the records. We can perform DML operation and direct path insert operation in Materialized View. =======================================

245.Informatica - Is it possible to refresh the Materialized view?



answer. October 05, 2006 05:37:16

#1

lingesh RE: Is it possible to refresh the Materialized view? Click Here to view complete document Yaa we can refresh materialized view. While creating of materialized views we can give options such as refresh fast and we can mention time so that it can refresh automatically and fetch new data i..e updateed data and inserted data. For active dataware house i mean inorder to have real time dataware house we can have materialized views. EX:- see this CREATE MATERIALIZED VIEW mv_emp_pk REFRESH FAST START WITH SYSDATE NEXT SYSDATE + 1/48 WITH PRIMARY KEY AS SELECT * FROM emp@remote_db;

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246.Informatica - What are the common errors that you face daily?

QUESTION #246 No best answer available. Please pick the good answer available or submit your answer. October 30, 2006 04:44:35 shiva RE: What are the common errors that you face daily?


#1


Click Here to view complete document mostly we are geting oracle fatal error.whilw the server is not able to connect the oracle server.

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247.Informatica - What is Shortcut? What is use of it?


October 03, 2006 04:17:18 Vamsi Krishna K. RE: What is Shortcut? What is use of it?

Click Here to view complete document Shortcut is a facility providing by informatica to share metadata objects across folders without copying the objects to every folder.we can create shortcuts for Source definitions Reusable transformations Mapplets Mappings Target definitions Business components.there are two diffrent types of shortcuts 1. local shortcut2. global shortcut =======================================

248.Informatica - what is the use of Factless Facttable?


October 04, 2006 01:24:36 opbang RE: what is the use of Factless Facttable?




Click Here to view complete document Factless Fact table are fact table which is not having any measures. For example - You want to store the attendance information of the student. This table will give you datewise whether the student has attended the class or not. But there is no measures because fees paid etc is not daily.

======================================= transaction can occur without the measure fore example victim id

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249.Informatica - while Running a Session, what are the two files it will create?


October 04, 2006 01:20:21 opbang


RE: while Running a Session, what are the two files it... Click Here to view complete document Session Log file and Session Detail file ======================================= Besides session log it also creates the following files if applicable - reject files target output file incremental aggregation file cache file =======================================

250.Informatica - give me an scenario where flat files are used?

QUESTION #250 No best answer available. Please pick the good answer available or submit your answer. October 05, 2006 00:26:01 file:///C|/Perl/bin/result.html (253 of 363)4/1/2009 7:50:58 PM

#1


opbang


RE: give me an scenario where flat files are used? Click Here to view complete document Loading data from flatfiles to database is faster. You are receiving a data from a remote location. At remote location the required data can be converted into flatfile and same you can use at target location for loading. This minimizes the requirement of bandwidth faster transmission.

======================================= Hi Flat files have some advantages which normal table does not have. First one is explained by first post. Secondly Flat file can work with case sensitivity issue of data easily. where normal table has errors.Kapil Goyal =======================================

251.Informatica - Architectural diff b/w informatica 7.1 and 5.1?


October 12, 2006 14:57:59 zskhan


RE: Architectural diff b/w informatica 7.1 and 5.1? Click Here to view complete document 1. v7 has repository server & pmserver v5 had pmserver only. pmserver does not directly talks to repository database it talks to repository server which in turn talks to database.

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252.Informatica - what r the types of data flows in workflow manager



October 10, 2006 13:03:29

#1

sravangopisetty RE: what r the types of data flows in workflow manager... Click Here to view complete document Types of dataflows1.sequential execution.2.paralal execution3.control flow execution =======================================

253.Informatica - what r the types of target loads


#1

Anonymous RE: what r the types of target loads Click Here to view complete document hi Target load plan is the process thru which u can decide the preference of the Target laod. lets say u have three S.Q n three instances of Targets by default informatica will load the data in the first target but using the Target load plan u can change this sequence ...by selecting vich target u want to be laoded first

======================================= we define target load plans in 2 ways 1. in mapping 2. in session



There are two types of target load typesthey are1. bulk2. normal =======================================

254.Informatica - Can we use lookup instead of join? reason


#1

srinivas vadlakonda RE: Can we use lookup instead of join? reason Click Here to view complete document yes we can use the lookup transformation instead of joiner but we can take the homogeous sources only. If u r taking joiner we can join the heterogeneous sources. ======================================= If the relationship to other table is a one to one join or many to one join then we can use lookup to get the required fields. In case the relationship is outer join joining both the tables will give correct results as Lookup returns only one row if multiple rows satisfy the join condition. =======================================

255.Informatica - what is sql override where do we use and which transformations

QUESTION #255 No best answer available. Please pick the good answer available or submit your answer. October 10, 2006 12:33:10 sravangopisetty RE: what is sql override where do we use and which tra...


#1


Click Here to view complete document THe defualt Sql Return by the source qualifier can be over writne by using source qualifier. Transfermation is Source qualifier transfermation. ======================================= 2.look up transfermation3.Target ======================================= Besides the answers above in Session properties -> transformations tab -> source qualifier ->SQL query - by default it will be the query from the mapping. If you over write it this is also called 'SQL override' ======================================= we use sql override for 3 transformationswhen the source is homo genious1. joiner transformation2. filter transformaton3. sorter transformation =======================================

256.Informatica - In a flat file sql override will work r not? what is the extension of flatfile.


#1

suri RE: In a flat file sql override will work r not? what ... Click Here to view complete document Nope. .out is the extension...

======================================= In Flat file SQL Override will not work. We have different properties to set for a flat file. If you are talking about the flat file as a source it can be of any extension like .dat .doc etc. Yes if it is an Target file it will have extension as .out. Which can be altered in the Target Properties. Regards Rajesh



======================================= Using flat files sql override willnot work. the extension of the flat files are .txt .doc .dat and the output or target flatfile extension is .out =======================================

257.Informatica - what is cost effective transformation b/w lookup and joiner QUESTION #257 No best answer available. Please pick the good answer available or submit your answer. October 11, 2006 11:14:23

#1

Myk RE: what is cost effective transformation b/w lookup a... Click Here to view complete document Are you lookuping flat file or database table? Generaly sorted joiner is more efective on flat files than lookup because sorted joiner uses merge join and cashes less rows. Lookup cashes always whole file. If the file is not sorted it can be comparable.Lookups into database table can be effective if the database can return sorted data fast and the amount of data is small because lookup can create whole cash in memory. If database responses slowly or big amount of data are processed lookup cache initialization can be really slow (lookup waits for database and stores cashed data on discs). Then it can be better use sorted joiner which throws data to output as reads them on input. =======================================

258.Informatica - WHAT IS THE DIFFERENCE BETWEEN LOGICAL DESIGN AND PHYSICAL DESIGN INA DATAWAREHOUSE

QUESTION #258 No best answer available. Please pick the good answer available or submit your answer. October 13, 2006 15:13:45 Anonymous RE: WHAT IS THE DIFFERENCE BETWEEN LOGICAL DESIG...


#1


Click Here to view complete document During the logical design phase you defined a model for your data warehouse consisting of entities attributes and relationships. The entities are linked together using relationships. During the physical design process you translate the expected schemas into actual database structures. At this time you have to map: ● ● ● ● ●

Entities to tables Relationships to foreign key constraints Attributes to columns Primary unique identifiers to primary key constraints Unique identifiers to unique key constraints

n if u refer this diag u will understand better : -

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259.Informatica - what is surrogate key ? how many surrogate key used in ur dimensions?

QUESTION #259 No best answer available. Please pick the good answer available or submit your answer. October 12, 2006 01:10:52 srinivas vadlakonda RE: what is surrogate key ? how many surrogate key use...


#1


Click Here to view complete document surrogate key is used to replacement of the primary key DWH does not depends upon the primary key it is used to identify the internal records each diemension should have atleast one surrogate key.

======================================= Surrogate key or warehouse key acts like a composite primary key. If the target doesn't have a unique key the surrogate key helps to address a particular row. It is like a primary key in the target.

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260.Informatica - what r the advantages and disadvantagesof a star schema and snoflake schema.thanks in advance.


#1

srinivas.vadlakonda RE: what r the advantages and disadvantagesof a ... Click Here to view complete document Schemas are two types starflake and snowsflake schema In starflake fact table is in normalized format and dimention table is in denormalized format In snowsflake both fact and dimention tables are in normalized format only if u r taking snowsflake it requires more dimention table and more foreign keys it will reduse the query performance. It will reduce the redundency.

======================================= Main advantage in starschema file:///C|/Perl/bin/result.html (260 of 363)4/1/2009 7:50:59 PM


1)it supports drilling and drill down options 2)fewer tables 3)less database In snowflake schema 1)degrade query peformance because more joins is there 2)savings small storage spaces

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261.Informatica - why do we use reusable sequencegenerator transformation only in mapplet?

QUESTION #261 No best answer available. Please pick the good answer available or submit your answer. November 16, 2006 06:05:48

#1

Sarada RE: why do we use reusable sequencegenerator transform... Click Here to view complete document The relation between reusable sequence generator and maplet is indirect. Reusable Sequence generator are preferably used when we want the same sequence (that is the next value of the sequence) to be used in more than one mapping (may be because this next value loading the same field of same table in different mappings and to maintain the continuity its required) suppose there are two mappings using a reusable sequence generator and we run the two mappings one by one. here if the last value for the sequence generator for the mapping1 run is 999 then the sequence generator value for second mapping will start from 1000. this is how we relate reusable sequence generator and maplet.



======================================= Hi Question is Are you sure its going to start with the 1000 number after the 999. By default for reusable SEQUENCE it has a cache value set to 1000 that's why it takes 1000 else if you only have 595 records for the 1st session and automatically the 2nd session will start with 1000 as the sequence number bcos the cache value is set to it. I got another question. Is it possible to change Number of Cached Values always to 1 instead of changing it after each time the session/sessions is/are run. Thanks Philip

======================================= Hi The solution provided is correct. I would like to add more information into it. Reusable Sequence Generator is a must for a Mapplet: Mapplet is basically to reuse a mapping as such if a non- reusable sequence generator is used in mapplet then the sequence of numbers it generates mismatches and creates problem. Thus it is made a must. =======================================

262.Informatica - in which particular situation we use unconnected lookup transformation? QUESTION #262 Submitted by: sridhar39 hi, both unconnected and connected will provide single output. if it is the case that we can use either unconnected or connected i prefer unconnected why because unconnected doesnot participate in the dataflow so informatica server creates a seperate cache for unconnected and processing takes place parallely. so performance increases.



Above answer was rated as good by the following members: Vamshidhar Click Here to view complete document We can use the unconnected lookup transformation when i need to return the only one port at that time i will use the unconnected lookup transformation instead of connected. We can also use the connected to return the one port but if u r taking unconnected lookup transformation it is not connected to the other transformation and it is not a part of data flow that why performance will increase.

======================================= The major advantage of unconnected lookup is its reusability. We can call an unconnected lookup multiple times in the mapping unlike connected lookup.

======================================= We can use the unconnected lookup transformation when we need to return the output from a single port. If we want the output from a multiple ports at that time we have to use connected lookup Transformation. ======================================= Use of connected and unconnected Lookup ic completely based on the logic which we need. However i just wanted to clear that we can get multiple rows data from an Unconnected lookup also. Just concatinate all the values which you want and get the result from the return row of unconnected lookup and then furthur split it in the expression. However using Unconnected lookup takes more time as it breaks the flow and goes to an unconnected lookup to fetch the results.

======================================= hi both unconnected and connected will provide single output. if it is the case that we can use either unconnected or connected i prefer unconnected why because unconnected doesnot participate in the dataflow so informatica server creates a seperate cache for unconnected and processing takes place parallely. so performance increases. =======================================

263.Informatica - in which particular situation we use dynamic file:///C|/Perl/bin/result.html (263 of 363)4/1/2009 7:50:59 PM


lookup?


October 17, 2006 01:06:34 srinivas vadlakonda RE: in which particular situation we use dynamic looku... Click Here to view complete document Specific situation is not there to use the dynamic lookup if u r using the dynamic it will increase the performance and also it will minimize the transformation like sequence generator.

======================================= If the no. of records are in hundreds one doesn't see much difference whether a static cache is used or dynamic cache. If there are thousands of records dynamic cache kills time because it commits the database for each insert or update it makes. =======================================

264.Informatica - is there any relationship between java & inforematica?


October 18, 2006 07:04:27 phanimv

Member Since: July 2006 Contribution: 41

RE: is there any relationship between java & inforemat...



Click Here to view complete document Like java informatica is a plat-form independent portable and architechtural nutral. =======================================

265.Informatica - How many types of flatfiles available in Informatica?


October 16, 2006 04:08:09 subbarao.g RE: How many types of flatfiles available in Informati... Click Here to view complete document There are two types of flate files: 1.Delimtedwidth 2.Fixdwidth

======================================= Thank you very much Subbarao..

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266.Informatica - what is the event-based scheduling?


October 25, 2006 15:42:32 sn3508 RE: what is the event-based scheduling?




Click Here to view complete document In time based scheduling the jobs run at the specified time. In some situations we've to run a job based on some events like if a file arrives then only the job has to run whatever the time it is. In such cases event based scheduling is used.

======================================= event based scheduling is using for row indicator file. when u dont no where is the source data that time we use shellcommand script batch file to send to the local directory of the informatica server is waiting for row indiactor file befor running the session.

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267.Informatica - what is the new lookup port in look-up transformation?


October 25, 2006 15:37:38 sn3508


RE: what is the new lookup port in look-up transformat... Click Here to view complete document I hope you're asking about the 'add a new port' button in the lookup transformation. If the answer is yes this button creates a port where we can enter the name datatype ...of a port. This is mainly used when using unconnected lookup this reflects the datatype of the input port. ======================================= Seems u r talking newlook up row when u configure u lookup as dyanamic lkp cache by default it will generates newlkprow it tells the informatica whether the row u got is existing or new row if it is new row it passes data. or else it discards.



This port is added by PC Client :-'Designer to a Lookup transformation when ever dynamic cache is used.This port is a indicator to Infa server action whether it is inserts or upates the dynamic cache through a numeric value.[0 1 2]. ======================================= The new port in lookup transformation is Associative port Cheers Bobby =======================================

268.Informatica - what is dynamic insert?


November 15, 2006 00:22:38 srinuv_11


RE: what is dynamic insert? Click Here to view complete document When we selecting the dynamic cache in look up transformation the informatica server create the new look up row port it will indicates the numeric value wheather the informatica server inserts updates or makes no changes to the look up cashe and if u associate a sequence id the informatica server create a sequence id for newly inserted records. ======================================= Hi srinu Can u explain how to associate sequence ? Thanks Sri.

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269.Informatica - how did you handle errors?(ETL-Row-Errors)



#1

November 29, 2006 02:02:06 phani RE: how did you handle errors?(ETL-Row-Errors) Click Here to view complete document Hi friend If there is an error comes it stored it on target_table.bad file. The error are in two type 1. row-based errors 2. column based errors column based errors identified by D-GOOD DATA N-NULL DATA O-OVERFLOW DATA R-REJECTED DATA the data stored in .bad file D1232234O877NDDDN23 Like that if any doubt give msg to my mail id

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270.Informatica - HOw do u setup a schedule for data loading from scratch?


December 12, 2006 17:08:30 hanug




RE: HOw do u setup a schedule for data loading from sc... Click Here to view complete document whether you are loading data from scratch(for the first time) or subsequent loads there is no changes to the scheduling. The change is how to pickup the delta data. Hanu.

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271.Informatica - HOw do u select duplicate rows using informatica?


#1

Sharmila RE: HOw do u select duplicate rows using informatica? Click Here to view complete document I thought we could identify dupilcates by using rank transformation. ======================================= can u explain what are the steps for identifying the duplicates with the help of rank transformation. ======================================= can u explain detail?

======================================= Hi You can write SQL override in the source qualifier (to eliminate duplicates). For that we can use distinct keyword. For example : consider a table dept(dept_no dept_name) and having duplicate records in that. then write file:///C|/Perl/bin/result.html (269 of 363)4/1/2009 7:50:59 PM


this following query in the Source Qualifier sql over ride. 1)select distinct(deptno) deptname from dept_test; 2)select avg(deptno) deptname from dept_test group by deptname; if you want to have only duplicate records then write the following query in the Source Qualifier SQL Override select distinct(deptno) deptname from dept_test a where deptno in( select deptno from dept_test b group by deptno having count(1)>1)

======================================= i think we cant select duplicates from rank transformation if it is possible means explain how to do it

======================================= We can get the duplicate records by using the rank transformation. ======================================= we can aso use sorter transfermation.seect distinct one check box. =======================================

272.Informatica - How to load data to target where the source and targets are XML'S?


October 25, 2006 15:23:31 sn3508


RE: How to load data to target where the source and ta...



Click Here to view complete document ●

● ● ●

If you don't have the structures create the Source or Target structure of the XML file by going to Sources or Targets menu and selecting 'Import XML' and follow the steps Follow the regular steps you would do to create an ordinary mapping/session. In the session you've to mention the location and name of source/target. Once the session is success the xml file will be generated in the specified location.

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273.Informatica - What TOAD and for what purpose it will be used?


#1

srinivas vadlakonda RE: What TOAD and for what purpose it will be used? Click Here to view complete document After creating the mapping we can execute the session for that mapping after that we can use the unit testing to test data. And we can use the oracle to test how many records are loaded into the target that loaded records are correct or not for this purposes we can use the oracle or Toad. ======================================= TOAD is a user friendly interface for relational databases like Oracle Sql Server DB2. While unit testing the development or query on tables one can use TOAD with basic knowledge on database commands. ======================================= Toad is a application development tool built around an advanced SQL and PL/SQL editor. Using Toad you can build and test PL/SQL packages procedures triggers and functions. You can create and edit database tables views indexes constraints and users. The Schema Browser and Project Manager provides quick access to database objects. Toad s SQL Editor provides an easy and efficient way to write and test scripts and queries and its powerful data grids provide an easy way to view and edit Oracle data. With Toad you can:


file:///C|/Perl/bin/result.html ● ● ● ● ● ● ● ● ●

View the Oracle Dictionary Create browse or alter objects Graphically build execute and tune queries Edit PL/SQL and profile stored procedures Manage your common DB tasks from one central window Find and fix database problems with constraints triggers extents indexes and grants Create code from shortcuts and templates Create custom code templates Control code access and development (with or without a third party version control product) using Toad's cooperative source control feature.

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274.Informatica - What is target load order ?


#1

ram gopal RE: What is target load order ? Click Here to view complete document In a mapping if there are more than one target table then we need to give in which order the target tables should be loaded example: suppose in our mapping there are 2 target table 1. customer 2. Audit table first customer table should be populated than Audit table for that we use target load order Hope u undeerstood



Target oad pan specifies the order in which the data being extracted from the source qualifier. =======================================

275.Informatica - How to extract 10 records out of 100 records in a flat file


#1

sridhar RE: How to extract 10 records out of 100 records in a ... Click Here to view complete document 1. create external directory 2. store the file in this external directory 3. create a external table corresponding to the file 4. query the external table to access records like u would do a normal table

======================================= hi For falt file sourec source--sq--sequence generator tran.on new fileld id--filter tran. id< 10--traget

=======================================

276.Informatica - How many types of TASKS we have in Workflomanager? What r they?



October 31, 2006 00:08:06

#1

kumar RE: How many types of TASKS we have in Workflomanager?... Click Here to view complete document session command email notification ======================================= work flow task : 1)session 2)command 3)email 4)control 5)command 6)presession 7)post session 8)assigment

======================================= 1) session2) command 3) email4) event-wait5) event-raise6) assignment7) control8) decision9) timer10) worklet3) 8) 9) are self explanatory. 1) run mappings. 2) run OS commands/scripts. 4 + 5) raise user-defined or pre-defined events and wait for the the event to be raised. 6) assign values to workflow var 10) run worklets. ======================================= The following Tasks we r having in Workflow manager Assignment Control Command decision E-mail Session Event-Wait Event-raise and Timer. The Tasks developed in the task developer rreusable tasks and taske which r developed by useing workflow or worklet r non reusable. Among these tasks only Session Command and E-mail r the reusable remaining tasks r non reusable.Regards rma ======================================= 1. Session ======================================= We have Session Command and Email tasks Cheers Thana =======================================

277.Informatica - What is user defined Transformation?



#1


n k rajkumar RE: What is user defined Transformation? Click Here to view complete document User Defined Transformations Are Stored Procedure and Sourcr Qualifier

=======================================

278.Informatica - what is the difference between connected stored procedure and unconnected stored procedure?


November 15, 2006 00:11:33 srinuv_11


RE: what is the difference between connected stored pr... Click Here to view complete document Connected stored procedure will execute when each row passed through the mapping then it will execute Unconnected stored procedure will execute when it is called by the another transformation and connected stored procedure is the part of a data flow in a pipe line but unconnected is not. =======================================

279.Informatica - what is semi additve measuresand fully additive measures QUESTION #279 No best answer available. Please pick the good answer available or submit your answer. November 03, 2006 06:17:52 rameshr


#1


RE: what is semi additve measuresand fully addi... Click Here to view complete document hi.... this is ramesh.....(if any one feel there is some conceptual problem with my solution plz let me now) there are three types of facts... 1.additive 2.semi additive 3. non-additive additve means when a any measure is queried of the fact table if the result relates to all the diemension table which are linked to the fact semi-additve when a any measure is queried from the fact table the results relates to some of the diemension table non-additive when a any measure is queried from the fact table if it does n't relate to any of the diemension and the result is driectly from the measures of the same fact table ex: to calculate the total percentage of loan just we take the value from the fact measure(loan) divide it with 100 we get it without the diemension...

======================================= hi additive means it can be summrized by any other column. semi additive means it can be summrized by some columns only.

======================================= hi can u give one example of additive and semi additive facts it ll be better for understand file:///C|/Perl/bin/result.html (276 of 363)4/1/2009 7:50:59 PM


Akhi

======================================= average monthly balance of your bank account is a semi-additive fact. ======================================= A measurable data on which simple addition can be performed is called fully additive such measurable data's no need to combine two or more dimensions for it's meaning Ex: Product wise total sales Branch wise total sales A measurable data on which simple addition can't be performed is called semi additive such measurable data's need to combine two or more dimensions for it's meaning Ex: customer wise total sales amount ---------> Has no meaning customer wise product total sales amount

If any one have doubt about this let me now

=======================================

280.Informatica - what is DTM process?

QUESTION #280 No best answer available. Please pick the good answer available or submit your answer. November 06, 2006 04:40:39 prasanna alur RE: what is DTM process?


#1


Click Here to view complete document DTM means data transformation manager.in informatica this is main back ground process.it run after complition of load manager.in this process informatica server search source and tgt connection in repository if it correct then informatica server fetch the data from source and load it to target.

======================================= dtm means data transmission manager. It is one of the component in informatica architecture. it will collect the data and load the data. ======================================= Load manager Process: Starts the session creates the DTM process and sends post-session email when the session completes. The DTM process. Creates threads to initialize the session read write and transform data and handle pre- and post-session operations. =======================================

281.Informatica - what is Powermart and Power Center?


#1

prasanna alur RE: what is Powermart and Power Center? Click Here to view complete document In power center we can register multiple server but in power mart its not possible.another diff is in PC we can create repository globle but it not in PM. ======================================= pc we will use in production environment. pm we will use in development environment

======================================= Hi power center will support global and local repositories and also it supports ERP packages. but file:///C|/Perl/bin/result.html (278 of 363)4/1/2009 7:50:59 PM


Powermart will support local repositories only and it doesn't support ERP packages . Power center is High Cost where as power mart it is Low. Power center normally used for enterprise data warehouses where as power mart will use for Low/Mid range data warehouses. Thanks and Regards Siva Prasad.

======================================= Power Center supports Partitioning process where as Power mart only does simple pass through.

=======================================

282.Informatica - what are the differences between informatica6.1 and informatica7.1


November 06, 2006 16:09:38 calltomadhu


RE: what are the differences between informatica6.1 a...



Click Here to view complete document load manager is a manager who will take care about the loading process from source to target

======================================= in informatica7.1 1. we can take flatfile as a target 2.flatfile as lookup table 3.dataprofiling&versioning 4.union transformation.it works like union all. thanks ®ards sivaprasad

=======================================

283.Informatica - hi, how we validate all the mappings in the repository at once


November 07, 2006 00:03:46 srinuv_11


RE: hi, how we validate all the mappings in the reposi...



Click Here to view complete document U r not able to validate all mappings at a time each time one mapping can be validated. ======================================= Hi You can not validate all the mappings in one go. But you can validate all the mappings in a folder in one go and continue the process for all the folders. For dooing this log on to the repository manager. Open the folder then the mapping sub folder then select all or some of the mappings(by pressing the shift or control key ctrl+A does not work) and then rightclick and validate.

======================================= hi you cant validate all maping at a time. you should go one by one. thanks madhu

======================================= Still we dont have such facility in informatica. ======================================= Yes. We can validate all mappings using the Repo Manager. =======================================

284.Informatica - hw to work with pmcmd on windows platform






RE: hw to work with pmcmd on windows platform Click Here to view complete document hi in workflow manager take pmcmd command. establish link between session and pmcmd. if session executes successfully pmcmd command executes. thanks madhu

======================================= Hi Frnd Can u plz tell me where is the PMCMD option in workflomanager.ThanksSwati. ======================================= Hi Swathi In commandline only we can execute pmcmd pmrep commands. In workflow manger we execute directly session task.

======================================= C:Program FilesInformatica PowerCenter 7.1.3Serverbinpmcmd.exe ======================================= C:-->Program Files-->Informatica PowerCenter 7.1.3-->Server-->bin-->pmcmd.exe =======================================

285.Informatica - inteview questionwhy do u use a reusable sequence genator tranformation in mapplets?



#1


srinuv_11


RE: inteview questionwhy do u use a reusa... Click Here to view complete document If u r not using reusable sequence generator transformation duplicasy will occur inorder to reduce this we can use reusable sequence generator transformation. ======================================= You can use sequence generator but is the usein the mapping it create not unique value ======================================= If we use same sequence generator for multiple times to load the data at same time there will be DEAD LLOCK occurs. To avoid Dead locks we dont use same sequence generator =======================================

286.Informatica - interview questiontell me what would the size of ur warehouse project?


November 13, 2006 00:09:10 srinuv_11


RE: interview questiontell me what would t... Click Here to view complete document U can say 900 mb ======================================= The size of EDW will be on Terabyte. The Server will run on Either Unix or Linux with SAN box ======================================= U can say 600-900GB including Ur Marts.It varies depending up on ur Project Structure and How many data marts and EDWH ======================================= Mr Srinuv by saying 900 MB r u kiddin with folks over here! Its a datawarehouse's size not some client server software.Thanks Vivek ======================================= You can answer this question as the number of facts and dimension in ur warehouse For Example: Insurance Datawarehouse 2 Facts : Claims and policy file:///C|/Perl/bin/result.html (283 of 363)4/1/2009 7:50:59 PM


8 Dimension : Coverage Customer Claim etc.... ======================================= I think the interviewer wants to the number of facts and dimensions in the warehouse and not the size in GB's or TB of the actual Database. =======================================

287.Informatica - what is grouped cross tab?




RE: what is grouped cross tab? Click Here to view complete document its one kind of report. generally we will use this one in cognos =======================================

288.Informatica - what is aggregate awareness?


#1

satya RE: what is aggregate awareness? Click Here to view complete document It is the ability to dynamically re-write SQL to the level of granularity neededto answer a business question =======================================

289.Informatica - Can we revert back reusable transformation to normal transformation?

QUESTION #289 No best answer available. Please pick the good answer available or submit your answer.



November 10, 2006 03:48:16

#1

satish RE: Can we revert back reusable transformation to norm... Click Here to view complete document yes ======================================= no ======================================= no it is not reversible... when you open a transformation in edit mode there is a check box named REUSABLE... if you tick it will give you a message saying that making reusable is not reversible...

======================================= No. Once we declared a transformation as a Reusable we cant able to revert. ======================================= Reverting to Original Reusable Transformation If you change the properties of a reusable transformation in a mapping you can revert to the original reusable transformation properties by clicking the Revert button.

======================================= No we CANNOT revert back the reusable transformation. There is a revert button that can revert the last changes made in the transformation. ======================================= No We cant revert a resuble tranformation to Normal Trasnsformation. Once we select reusable colun will be enabled.

======================================= YES...we can. 1) Drag the reusable transformation from Repository Navigator into Mapping Designer by pressing the file:///C|/Perl/bin/result.html (285 of 363)4/1/2009 7:50:59 PM


left button of the mouse 2 ) and then press the Ctrl key before releasing the left button of mouse. 3) Release the left button of mouse. 4) Enjoy....:-) Thanks Santu ======================================= the last answer though correct in a way is not completely correct. by using the ctrl key we are making a copy of the original transformation but not changing the original transformation into a non-reusable one. ======================================= I think if the transformation is created in Mapping designer and make it as reusable then we can revert back that one by the option "revert Back". But if we create transformation in Mapplet we can make it as non reusable one =======================================

290.Informatica - How do we delete staging area in our project?


#1

narayana RE: How do we delete staging area in our project? Click Here to view complete document If your database is oracle then we can apply CDC(change data capture) and load data which is only changed recently after previous data load.

======================================= if staging area is storing only incremental data ( means changed or new data with respect to previous load) then you can truncate the staging area. But if you maintain historical information in staging area then you can not truncate your staging area.



======================================= If we use Type 2 of slowly changing dimensions we can delete staging area. because SCD Type 2 stores previous data with version number and time stamp. =======================================

291.Informatica - what is referential Intigrity error? how ll u rectify it?


November 27, 2006 06:48:12 Sravan RE: what is referential Intigrity error? how ll u rect...

Click Here to view complete document referential Intigrity is all about foreign key relationship between tables. Need to check for the primary and foreign key ralationship and the existing data if any.(see if child table has any records which are poiting to the master table records that are no more in master table.) ======================================= You have set the session for constraint-based loading but the PowerCenter Server is unable to determine dependencies between target tables possibly due to errors such as circular key relationships. Action: Ensure the validity of dependencies between target tables

=======================================

292.Informatica - what is constraint based error? how ll u clarify it?


November 13, 2006 00:07:44 srinuv_11


RE: what is constraint based error? how ll u clarify i...



Click Here to view complete document Constraint based error will occur if the pk is duplicate in a table ======================================= it is a primary and forigen key relationship. ======================================= hi when data from a single source needs to be loaded into multiple targets in that situation we use constraint based load ordering.Note: The target tables must have primary - foreign key relationships. regards Phani... ======================================= 1. when data from a single source needs to be loaded into multiple targets =======================================

293.Informatica - why exactly the dynamic lookup?plz can any bady can clarify it?


November 13, 2006 00:03:24 srinuv_11


RE: why exactly the dynamic lookup?plz can any bady ca... Click Here to view complete document Dynamic look up means if the changes are applying to the look up chache then we can say it the dynamic look up. ======================================= hii... y dynamic lookup..... suppose u r looking up a table that is changing frequently i.e u want to lookup recent data then u have to go for dynamic lookup......ex: online trancation data(ATM)

======================================= Dynamic Lookup generally used for connect lkp transformation when the data is cgenged then is updating insert or its leave without changing ..... file:///C|/Perl/bin/result.html (288 of 363)4/1/2009 7:50:59 PM


======================================= Dynamic lookup cache is used in case of connected lookups only It is also called as read and write cache when a new record is inserted into the target table then cache is also updated with the new record it is saved in the cache for faster lookup of data from the target. Generally we use this in case of slowly changing dimensions. Pallavi

=======================================

294.Informatica - How many mappings you have done in your project(in a banking)?


November 13, 2006 00:01:56 srinuv_11


RE: How many mappings you have done in your project(in... Click Here to view complete document Depends on the dimensions for suppose if u r taking the banking porject it requires the dimension like time primary account holder branch like we can take any no of dimension depending on the project and we can create the mapping for cleancing the data or scrubbing the data for this also we can create the mappings we can't exact this many. ======================================= It depend upon the user requirement.according to user requirement we can configure the modelling .On that modelling basis we can identify the no of mappings which includes simple mapping to complex mapping. ======================================= Exactly 93.133 =======================================

295.Informatica - what are the UTP'S



#1


raja147


RE: what are the UTP'S Click Here to view complete document hiutps are done to check the mappings are done according to given business rules.utp is the (unit test plan ) done by deveploper. ======================================= After creating the mapping each mapping can be tested by the developer individualy =======================================

296.Informatica - how can we delete duplicate rows from flat files ?


#1

amarnath RE: how can we delete duplicate rows from flat files ?... Click Here to view complete document by using aggregater ======================================= We can delete duplicate rows from flat files by using Sorter transformation. ======================================= Sorter Transofrormation do the records in sorting order(for better performence) . iam asking how can we delete duplicate rows ======================================= use a lookup by primary key ======================================= In the mapping read the flat file through a Source Definition and SQ. Apply a Sorter Transformation in the property tab select distinct . out put will give a sorter distinct data hence you get rid of duplicates. You can also use an Aggegator Transformation and group by the PK. Gives the same result.

======================================= Use Sorter Transformation and check Distinct option. It will remove the duplicates. file:///C|/Perl/bin/result.html (290 of 363)4/1/2009 7:50:59 PM


=======================================

297.Informatica - 1.can u look up a flat file ? how ?2.what is test load?


#1

sravan kumar RE: 1.can u look up a flat file ? how ?2.what i... Click Here to view complete document By Using Look up transformation we can look up A flat file.When u click Look up transformation it shows u the message.Follow that. Test load is nothing but checking whether the data is moving correctly to the target or not.

======================================= Test load is the property we can set at the session property level by which Informatica performs all pre and post session tasks but does not save target data(in RDBMS target table it writes the data to check the constraints but rolls it back). If the target is flat file then it does not write anything in the file. We can specify number of source rows to test load the mapping. This is another way of debugging the mapping without loading the target. =======================================

298.Informatica - what is auxiliary mapping ?

QUESTION #298 No best answer available. Please pick the good answer available or submit your answer. December 26, 2006 03:27:18 Kuldeep Kumar Verma RE: what is auxiliary mapping ?


#1


Click Here to view complete document Auxiliary Mapping is used to reflect change in one table when ever there is a change in the other table. Example: In Siebel we have S_SRV_REQ and S_EVT_ACT table Lets say that we have a image table defined for S_SRV_REQ from where our mappings read data. Now if there is any change in S_EVT_ACT then it wont be captured in S_SRV_REQ if our mappings are using image table for S_SRV_REQ. To overcome this we define a mapping beteen S_SRV_REQ and S_EVT_ACT such that if there is any change in second it will be reflected as an update in the first table.

=======================================

299.Informatica - what is authenticator ?


#1

Reddappa C. Reddy RE: what is authenticator ? Click Here to view complete document An authenticator is either a token of authentication (is the act of establishing or confirming something or someone) or one who authenticates ======================================= Authentication requests validate user names and passwords to access the PowerCenter repository.You can use the following authentication requests to access the PowerCenter repositories: Login Logout The Login function authenticates user name and password for a specified repository. This is the first function a client application should call before calling any other functions. The Logout function disconnects you from the repository and its PowerCenter Server connections. You can call this function once you are done calling Metadata and Batch Web Services functions to release resources at the Web Services Hub. =======================================

300.Informatica - how can we populate the data into a time dimension ?



answer. #1

December 03, 2006 22:04:48 sravan kumar RE: how can we populate the data into a time dimension... Click Here to view complete document By using Stored procedure Transformation. ======================================= how ? can u explain. ======================================= can u plz explain me about time dimension. =======================================

301.Informatica - how to create primary key only on odd numbers? QUESTION #301 No best answer available. Please pick the good answer available or submit your answer. #1

December 07, 2006 02:50:14 Pavan.m RE: how to create primary key only on odd numbers? Click Here to view complete document Use sequence generator to generate warehouse keys and set the 'Increment by ' property of sequence genrator to 2. ======================================= Use sequence generator and set the 'Increment by' property in that with 2. =======================================

302.Informatica - How to load fact table ?


December 11, 2006 16:59:11 hanug




RE: How to load fact table ? Click Here to view complete document HI: There are two ways u have to load fact table. 1. First time load 2. Incremental load or delta load In both cases u have to aggregate get the keys of the dimentional tables and load into Fact. In case of increments u use date value to pickup only delta data while loading into fact. Hanu.

======================================= Fact tables always maintain the history records and mostly consists of keys and measures So after all teh dimension tables are populated teh fact tables can be loaded. The load is always going to be a incremental load except for the first time which is a history load.

=======================================

303.Informatica - How to load the time dimension using Informatica ?

QUESTION #303 No best answer available. Please pick the good answer available or submit your answer. December 22, 2006 00:32:54 srinivas RE: How to load the time dimension using Informatica ?...


#1


Click Here to view complete document HI use scd-type2-effectivedate range.

======================================= Hi Use strored procedure tranformation to load time dimention

======================================= Hi Kiran Can U plz tell me in detail how do we do that?I am a fresher in informatica...plz help. thanks.

=======================================

304.Informatica - What is the process of loading the time dimension?


December 29, 2006 08:20:34 manisha.sinha


RE: What is the process of loading the time dimension?...



Click Here to view complete document create a procedure to load data into Time Dimension. The procedure needs to run only once to popullate all the data. For eg the code below fills up till 2015. You can modify the code to suit the feilds in ur table. create or replace procedure QISODS.Insert_W_DAY_D_PR as LastSeqID number default 0; loaddate Date default to_date('12/31/1979' 'mm/dd/yyyy'); begin Loop LastSeqID : LastSeqID + 1; loaddate : loaddate + 1; INSERT into QISODS.W_DAY_D values( LastSeqID Trunc(loaddate) Decode(TO_CHAR(loaddate 'Q') '1' 1 decode(to_char(loaddate 'Q') '2' 1 2) ) TO_FLOAT(TO_CHAR(loaddate 'MM')) TO_FLOAT(TO_CHAR(loaddate 'Q')) trunc((ROUND(TO_DECIMAL(to_char(loaddate 'DDD'))) + ROUND(TO_DECIMAL(to_char(trunc(loaddate 'YYYY') 'D')))+ 5) / 7) TO_FLOAT(TO_CHAR(loaddate 'YYYY')) TO_FLOAT(TO_CHAR(loaddate 'DD')) TO_FLOAT(TO_CHAR(loaddate 'D')) TO_FLOAT(TO_CHAR(loaddate 'DDD')) 1 1 1 1 1 TO_FLOAT(TO_CHAR(loaddate 'J')) ((TO_FLOAT(TO_CHAR(loaddate 'YYYY')) + 4713) * 12) + TO_number(TO_CHAR(loaddate 'MM')) ((TO_FLOAT(TO_CHAR(loaddate 'YYYY')) + 4713) * 4) + TO_number(TO_CHAR(loaddate 'Q')) TO_FLOAT(TO_CHAR(loaddate 'J'))/7 TO_FLOAT (TO_CHAR (loaddate 'YYYY')) + 4713 TO_CHAR(load_date 'Day') TO_CHAR(loaddate 'Month') Decode(To_Char(loaddate 'D') '7' 'weekend' '6' 'weekend' 'weekday') Trunc(loaddate 'DAY') + 1 Decode(Last_Day(loaddate) loaddate 'y' 'n') file:///C|/Perl/bin/result.html (296 of 363)4/1/2009 7:50:59 PM


to_char(loaddate 'YYYYMM') to_char(loaddate 'YYYY') || ' Half' || Decode(TO_CHAR(loaddate 'Q') '1' 1 decode(to_char(loaddate 'Q') '2' 1 2) ) TO_CHAR(loaddate 'YYYY / MM') TO_CHAR(loaddate 'YYYY') ||' Q ' ||TRUNC(TO_number( TO_CHAR(loaddate 'Q')) ) TO_CHAR(loaddate 'YYYY') ||' Week'||TRUNC(TO_number( TO_CHAR(loaddate 'WW'))) TO_CHAR(loaddate 'YYYY')); If loaddate to_Date('12/31/2015' 'mm/dd/yyyy') Then Exit; End If; End Loop; commit; end Insert_W_DAY_D_PR;

=======================================

305.Informatica - how can we remove/optmize source bottlenecks using "query hints"


January 08, 2007 16:29:36 creativehuang


RE: how can we remove/optmize source bottlenecks using...



Click Here to view complete document it's SQL server question ?or informatica question? ======================================= Create indexes for source table colums ======================================= first u must have proper indexes and the table must be analyzed to gather stats to use the cbo. u can get free doc from oracle technet. use the hints after and it is powerful so be careful with the hints. =======================================

306.Informatica - how can we eliminate source bottleneck using query hint


March 12, 2007 06:28:50 sreedhark26


RE: how can we eliminate source bottleneck using query... Click Here to view complete document You can identify source bottlenecks by executing the read query directly against the source database. Copy the read query directly from the session log. Execute the query against the source database with a query tool such as isql. On Windows you can load the result of the query in a file. On UNIX systems you can load the result of the query in /dev/null. Measure the query execution time and the time it takes for the query to return the first row. If there is a long delay between the two time measurements you can use an optimizer hint to eliminate the source bottleneck.

=======================================

307.Informatica - where from we get the source data or how we access the source data



answer. January 03, 2007 00:58:49

#1

phani RE: where from we get the source data or how we access... Click Here to view complete document Hi We get souce data in the form of excel files flat files etc. By using source analyzer we can access the souce data

======================================= hisource data exists in OLTP systems of any form (flat file relational database. xml definitions.)u can acces the source data with any of the source qualifier transformationsw and normaliser tranaformation. =======================================

308.Informatica - What are all the new features of informatica 8.1?

QUESTION #308 No best answer available. Please pick the good answer available or submit your answer. February 03, 2007 01:57:27 Sonjoy RE: What are all the new features of informatica 8.1?


#1


Click Here to view complete document 1. Java Custom Transformation support2. HTTP trans support3. New name of Superglue as Metadata manager4. New name of Power Analyzer as Data Analyzer5. Support Grid Computing6. Push down Optimization ======================================= 1. 2. 3. 4. 5. 6.

Power Center 8 release has "Append to Target file" feature. ava transformation is introduced. User defined functions Midstream SQL transformation has been added in 8.1.1 not in 8.1. Informatica has added a new web based administrative console. Management is centralized that means services can be started and stopped on nodes via a central web interface

=======================================

309.Informatica - Explain the pipeline partition with real time example?


January 11, 2007 14:56:16 saibabu


RE: Explain the pipeline partition with real time exam... Click Here to view complete document PIPELINE SPECIFIES THE FLOW OF DATA FROM SOURCE TO TARGET .PIPELINE PARTISON MEANS PARTISON THE DATA BASED ON SOME KEY VALUES AND LOAD THE DATA TO TARGET UNDER CONCURRENT MODE. WHICH INPROVES THE SESSION PERFORMANCE i.e data loading time reduces. in real time we have some thousands of records exists everyday to load the data to targets .so pipeline partisoning definetly reduces the data loading time. =======================================

310.Informatica - How to FTP a file to a remote server?

QUESTION #310 No best answer available. Please pick the good answer available or submit your answer. January 08, 2007 16:04:23 file:///C|/Perl/bin/result.html (300 of 363)4/1/2009 7:50:59 PM

#1


creativehuang


RE: How to FTP a file to a remote server? Click Here to view complete document ftp targetaddress go to your target directory ftp> ascii or bin ftp> put or get

======================================= Hi U can transfer file from one server to other..............In unix there is an utililty XCOMTCP which transfer file from one server to other. But lot of constraints they are for this..... U need to mention target server name and directory name where u need to send.The server directory should have write permetion.....Check in detail in UNIX by typing MAN XCOMTCP command which guides u i guess. =======================================

311.Informatica - What's the difference between source and target object definitions in Informatica?

QUESTION #311 No best answer available. Please pick the good answer available or submit your answer. January 05, 2007 09:06:50 Sravan Kumar RE: What's the difference between source and target ob...


#1


Click Here to view complete document Source system is the system which provides the business data is called as source system Target system is a system to which the data being loads

======================================= source definition is the structure of the source database existed in the OLTP system . using source definition u can extrcact the transactional data from OLTP SYSTEMS.TARGET DEFINITION IS THE STRUCTURE GIVEN BY THE DBA's TO POPULATE THE DATA FROM SOURCE DEFINITION ACCORDING BUSINESS RULES FOR THE PURPOSE OF MAKING EFFECTIVE DESITIONS FOR THE ENTERPRISE. ======================================= Hai what Saibabu wrote is correct.Source definition means defining the structure of the source from which we have to extract the data to transform and then load to the target.Target definition means defining the structure of the target (relation table or flat file) =======================================

312.Informatica - how many types of sessions are there in informatica.please explain them.


January 08, 2007 15:56:28 creativehuang


RE: how many types of sessions are there in informatic... Click Here to view complete document reusable nonusable session

======================================= Total 10 SESSIONS 1. SESSION: FOR MAPPING EXECUTION



2. EMAIL:TO SEND EMAILS 3. COMMAND: TO EXECUTE OS COMMANDS 4 CONTROL: FAIL STOP ABORT 5.EVENT WAIT: FOR PRE_DEFINED OR POST_DEFINED EVENTS 6 EVENT RAISE:TO RAISE ACTIVE USER_DEFINED EVENT 7. DECISSION :CONDITION TO BE EVALUATED FOR CONTROLING FLOW OR PROCESS 8. TIMER: TO HALT THE PROCESS FOR SPECIFIC TIME 9.WORKLET TASK: REUSABLE TASK 10.ASSIGNEMENT: TO ASSIGN VALUES WORKLET OR WORK FLOW VARIABLES

======================================= Session is a type of workflow task and set of instructions that describe how to move Data from Source to targets using a mapping There are two session in informatica 1. sequential: When Data moves one after another from source to target it is sequential 2.Concurrent: When whole data moves simultaneously from source to target it is Concurrent

======================================= Hi Vidya Above Qestion is How many sessions? your answer is Bathes ?



HI Sreedhark26ur answer is wrong . dont minguide the members .what u wrote is types of tasks used fby the workflow manager.there r two types of sessions1.non resuable session2.reusable session =======================================

313.Informatica - What is meant by source is changing incrementally? explain with example


#1

Sravan Kumar RE: What is meant by source is changing incrementally?... Click Here to view complete document Source is changing Incrementally means the data in the source is keep on changing and your capturing that changes with time stamps keyrange and with triggers scds.Capture these changes to load the data incrementally.If We cannot capture this source data incrementally the data loading process will be very difficult.For example we have a source where the data is changing.On 09/01/07 we have loaded all the data in to the target.On 10/01/07 the source is updated with some new rows .It is very difficult to load all the rows again in the target so what we have to do is capture the data whch is not loaded and load only the changed rows into the target.

======================================= I have a good example to explain this . Think about HR Data for a very big Company. The data keep on changing every minute. Now We had build a downstream system to capture a chunk of data for specific purpose say New Hirees . Every record in the source will have time stamp when we load data today we check the records which are updated/inserted today and will load them (This avoids to reprocess all the data). We used incremental Refresh method to process such data. Infact most of the sources in OLTP are incremental changing/constantly changing. =======================================

314.Informatica - what is the diffrence between SCD and INCREMENTAL Aggregation?

QUESTION #314 No best answer available. Please pick the good answer available or submit your answer. January 09, 2007 23:19:44 file:///C|/Perl/bin/result.html (304 of 363)4/1/2009 7:50:59 PM

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srinivas RE: what is the diffrence between SCD and INCREMENTAL ... Click Here to view complete document Hi HIRE DIMENSIONAL DATA IS STORED. NO AGGRIGATE CALCULATIONS SCD WE R USING 3 WAYS 1.TYPE-1: IT'S MAINTAIN CURRENT DATA ONY 2.TYPE-2: IT'S MAINTAIN CURRENT DATA + COMPLET HOSTROY RECORDS THESE R 3 WAYS :1.FLAG DATA 2.VERSION NO MAPPING 3.EFFECTIVE DATE RANGE 3.TYPE-3: IT'S MAINTAIN CURRENT DATA +ONE TIME HISTROY INCREMENTAL AGGRATION ARE STORED AGGRAGATE VALUES ACCORDING TO THE USER REQUIREMENTS

======================================= hi scd means 'slowly changing dimentions'since dimention table maintains master data the column values occationally changed .so dimention tables are called as scd tables and the fields in the scd tables are called as slowly changing dimentions .in order to maintain those changes we are following three types of methods.1. SCD TYPE1 this method maintains only current data2. SCD TYPE2 this method maintains whole history of the dimentions here three methods to identify which record is current one . 1> flag current data 2> version number mapping 3> effective date range3. SCD TYPE3 this method maintains current data and one time historical data.INCREMENTAL AGGRIGATIONsome requirements (daily weekly every 15 days quartly..........) need to aggrigate the values of certain colums. HERE U have to do the same job every time (according to requirement) and add the aggrigate value to the previous aggrigate value(previous run value) of those column.THE PROCESS CALLED AS INCREMENTAL AGGRIGATION. ======================================= file:///C|/Perl/bin/result.html (305 of 363)4/1/2009 7:50:59 PM


315.Informatica - when informatica 7.1.1 version was introduced into market




RE: when informatica 7.1.1 version was introduced into... Click Here to view complete document 2004 =======================================

316.Informatica - what is the advantages of converting stored procedures into Informatica mappings?


January 18, 2007 12:41:55 Gayathri84


RE: what is the advantages of converting stored proced... Click Here to view complete document Stored Procedures are Hard to maintain and Debug . Maintaince is simpler in Informatica. Its a User friendly tool. Given the Logic. Its eaier to create a Mapping in Informatica than write a Stored Procedure. Thanks Gayathri

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a stored procedure call is made thru an ODBC connection over a network (sometimes the info server resides on the same box as the db)...since there is an overhead in making the call it is inherently slower. =======================================

317.Informatica - How a LOOKUP is passive?


January 19, 2007 15:54:06 monicageller


RE: How a LOOKUP is passive? Click Here to view complete document Hi Unconnected lookup is used for updating Slowly Chaging Dimensions...so it is used to determine whether the rows are already in the target or not but it doesn't change the no. of rows ...so it is passive. Connected lookup transformations are used to get a related value based on some value or to perform a calculation.....in either case it will either increase no. of columns or not...but doesn't change row count... so it is passive. In lookup SQL override property we can add a WHERE statement to the default SQL statement but it doesn't change no. of rows passing through it it just reduces the no. of rows included in the cache. cheers Monica.

======================================= the fact that a failed lookup does not erase the row makes it passive. ======================================= Lookup is using for geta a related value and perform calculation. lookup is using for search value from relational table. =======================================

318.Informatica - How to partition the Session?(Interview file:///C|/Perl/bin/result.html (307 of 363)4/1/2009 7:50:59 PM


question of CTS)


January 23, 2007 15:53:48 kirangvr


RE: How to partition the Session?(Interview question o... Click Here to view complete document o Round-Robin: PC server distributes rows of data evenly to all partitions. @filtero Hash keys: distribute rows to the partitions by group. @rank sorter joiner and unsorted aggregator.o Key range: distributes rows based on a port or set of ports that you specify as the partition key. @source and targeto Pass-through: processes data without redistributing rows among partitions. @any valid partition point. Hope ot helps you. ======================================= When you create or edit a session you can change the partitioning information for each pipeline in a mapping. If the mapping contains multiple pipelines you can specify multiple partitions in some pipelines and single partitions in others. You update partitioning information using the Partitions view on the Mapping tab in the session properties. You can configure the following information in the Partitions view on the Mapping tab: ● ● ● ●

Add and delete partition points. Enter a description for each partition. Specify the partition type at each partition point. Add a partition key and key ranges for certain partition types.

======================================= By default when we create the session workflow creates pass-through partition points at Source Qualifier transformations and target instances.

=======================================

319.Informatica - which one is better performance wise joiner or lookup file:///C|/Perl/bin/result.html (308 of 363)4/1/2009 7:50:59 PM



January 25, 2007 13:41:43 anu RE: which one is better performance wise joiner or loo...

Click Here to view complete document Are you lookuping flat file or database table? Generaly sorted joiner is more effective on flat files than lookup because sorted joiner uses merge join and cashes less rows. Lookup cashes always whole file. If the file is not sorted it can be comparable.Lookups into database table can be effective if the database can return sorted data fast and the amount of data is small because lookup can create whole cash in memory. If database responses slowly or big amount of data are processed lookup cache initialization can be really slow (lookup waits for database and stores cashed data on discs). Then it can be better use sorted joiner which throws data to output as reads them on input. =======================================

320.Informatica - what is associated port in look up.


February 01, 2007 16:08:08 kirangvr RE: what is associated port in look up.




Click Here to view complete document When you use a dynamic lookup cache you must associate each lookup/output port with aninput/output port or a sequence ID. The PowerCenter Server uses the data in the associatedport to insert or update rows in the lookup cache. The Designer associates the input/outputports with the lookup/output ports used in the lookup condition. ======================================= whenever you are using scd2 you have to use dynamic cache then one port must be specified for updating in cache that port is called associated port. =======================================

321.Informatica - what is session recovery?


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pal RE: what is session recovery? Click Here to view complete document Session recovery is used when you want the session to continue loading from the point where it stopped last time it ran.for example if the session failed after loading 10 000 records and you want the 10 001 record to be loaded then you can use session recovery to load the data from 10 001. ======================================= when ever session fails then we have to follow these steps: if no commit is performed by the informatica server then run session again. if at least one commit is performed by the session recover the session. if recover is not possible truncate the target table and load again.

recovery option is set in the informatica server. i just forgotten where to do recovery i will tell you next time or you search for it ======================================= If the recover option is not set and 10 000 records are committed then delete the record from the target table using audit fields like update_date. ======================================= file:///C|/Perl/bin/result.html (310 of 363)4/1/2009 7:50:59 PM


322.Informatica - what are the steps follow in performance tuning ?


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pal RE: what are the steps follow in performance tuning ? Click Here to view complete document Steps for performance tuning: 1) Target bottle neck 2) source bottle-neck 3)mapping bottle-neck etc..As a developer we just can clear the bottle necks at the mapping level and at the session level. for example 1) Removing transformation errors. 2) Filtering the records at the earliest. 3) Using sorted data before an aggregator. 4) using less of those transformations which use cache. 5) using an external loader like sql loader etc to load the data faster. 6) less no of conversions like numeric to char and char to numeric etc 7) writing an override instead of using filter etc. 8)increasing the network packet size. 9) all the source systems in the server machine to make it run faster etc pal. ======================================= Hai Friends Performance tuning means techniques for improving the performance.1. Identify the Bottlenecks(issues that reduces performance)2. Configure the Bottlenecks.The Hierarchy we have to follow in performance tuning is a) Target b) Source c) Mapping d) Session e) SystemIf anything wrong in this plz. tell me. because I am still in the learning stage. ======================================= ======================================= Hi Friends Please clarify me What is mean by "bottle neck".For ex file:///C|/Perl/bin/result.html (311 of 363)4/1/2009 7:50:59 PM


1) Target bottle neck 2) source bottle-neck 3)mapping bottle-neck I am not aware what does this bottle neck meant. Thanks for your help in advance. Thanks Thana

======================================= Bottle neck means drawbacks or problems ======================================= Target commit intervals and Source - based commit intervals. =======================================

323.Informatica - How to use incremental aggregation in real time? QUESTION #323 No best answer available. Please pick the good answer available or submit your answer. #1

February 21, 2007 22:48:09 Hanu Ch Rao RE: How to use incremental aggregation in real time? Click Here to view complete document The first time you run a session with incremental aggregation enabled the server process the entire source. =======================================

324.Informatica - Which transformation replaces the look up transformation?


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hegde RE: Which transformation replaces the look up transfor... Click Here to view complete document can u pls clarify ur ques? ======================================= Is there any transformation that could do the function of a lookup transformation. or Is there any transformation that we can use instead of lookup transformation. ======================================= question is misleading ... do you mean look up transformation will become obsolete since new transformation is created to do same thing in a better way ? which version ? ======================================= Yes Joiner with Source outer Join and Stored Procedure can replace look-up transformation ======================================= You can use Joiner transformation instead of lookup look up is only for relational tables which are not sources in your source analyzer but by using joiner we can join relational and flat files relational sources on different platforms. ======================================= Vicky Can you please Validate your answer with some example ?? ======================================= Hi Actually by look up t/s we are looking the required fields in the target and comparing with source ports.. Without look up we can do by joiner Master outer joiner means Matched rows of both t/s and unmatched from master table.. So you can get all changes.. if any doubt reply me back.. i will give another general example to you ======================================= plz don't mislead......... A master outer join keeps all rows of data from the detail source and the matching rows from the master source. It discards the unmatched rows from the master source.

=======================================



I hope The Joiner transformation is only for join the hetrogeneous sources.For Eg when we use one source from Flat file and another one is from Relational.I have a question as "How Joiner transformation overrides the Lookup" however both transformation performs different actions.

Cheers Thana

======================================= Lookup is nothing but Outer Join. So Look up t/s can be easily replaced by a joiner in any tool.

=======================================

325.Informatica - What is Dataware house key?


#1

Ravichandra RE: What is Dataware house key? Click Here to view complete document Dataware house key is warehouse key or surrogate key.ie generated by sequence generator.this key used in loading data into fact table from dimensions. ======================================= is it really called Data Warehouse Key ? is there such a term ? ======================================= I never heard this type of key is there in DWH terminology!!!!!!!!! ======================================= How datawarehouse key is called as surrogate key ======================================= There is a Dataware house key........plz go thru kimball book Every data warehouse key should be a surrogate key because the data warehouse DBA must have the flexibility to respond to changing descriptions and abnormal conditions in the raw data. ======================================= file:///C|/Perl/bin/result.html (314 of 363)4/1/2009 7:50:59 PM


Surrogate key is know as datawarehouse key. Surrogate key is used as a unique key in warehouse where dupicate keys may exits due to type 2 changes. =======================================

326.Informatica - What is inline view?


#1

Hanu Ch Rao RE: What is inline view? Click Here to view complete document The inline view is a construct in Oracle SQL where you can place a query in the SQL FROM clause just as if the query was a table name. A common use for in-line views in Oracle SQL is to simplify complex queries by removing join operations and condensing several separate queries into a single query

======================================= used in oracle to simplify queries ex: select rowid from (select ename from emp group by sal) where rowid<2 =======================================

327.Informatica - What is the exact difference between joiner and lookup transformation

QUESTION #327 No best answer available. Please pick the good answer available or submit your answer. February 20, 2007 12:21:06 pal RE: What is the exact difference between joiner and lo...


#1


Click Here to view complete document A joiner is used to join data from different sources and a lookup is used to get a related values from another table or check for updates etc in the target table. for lookup to work the table may not exist in the mapping but for a joiner to work the table has to exist in the mapping. pal. ======================================= a lookup may be unconnected while a joiner may not ======================================= lookup may not participate in mapping lookup does only non equi join joiner table must paraticipate in mapping joiner does only outer join =======================================

328.Informatica - Explain about scheduling real time in informatica


March 01, 2007 06:45:31 sanghala


RE: Explain about scheduling real time in informatica Click Here to view complete document Scheduling of Informatica jobs can be done by the following ways: ● ● ●

Informatica Workflow Manger Using Cron in Unix Using Opcon sheduler

=======================================

329.Informatica - How do you handle two sessions in Informatica QUESTION #329 can any one tell me the option between the two session . if file:///C|/Perl/bin/result.html (316 of 363)4/1/2009 7:50:59 PM


previous session execute successfully than run the next session... Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. February 28, 2007 02:09:40

#1

Divya Ramanathan RE: How do you handle two sessions in Informatica

======================================= You can handle 2 session by using a link condition (id $ PrevTaskStatus SUCCESSFULL) or you can have a decision task between them. I feel since its only one session dependent on one have a link condition ======================================= By giving a link condition like $PrevTaskStatus SUCCESSFULL

======================================= where exactly do we need to use this link condition (id $ PrevTaskStatus SUCCESSFULL) ======================================= you can drag and drop more than one session in a workflow. there will be linking different and is sequential linking concurrent linking in sequential linking you can run which ever session you require or if the workflow runs all the sessions sequentially. in concurrent linking you can't run any session you want.

=======================================

330.Informatica - How do you change change column to row in Informatica



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Hanu Ch Rao RE: How do you change change column to row in Informat... Click Here to view complete document Hi We can achieve this by Normalizer trans. ======================================= First u can ask what type of data change columns to rows in informatica? Next we can use expression and aggregator transformation. aggregator is using group by duplicate rows =======================================

331.Informatica - write a query to retrieve the latest records from the table sorted by version(scd).


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sunil RE: write a query to retrieve the latest records from ... Click Here to view complete document you can write a query like inline view clause you can compare previous version to new highest version then you can get your result ======================================= hi Sunil Can u please expalin your answer some what in detail ???? ======================================= Hi

Assume if you put the surrogate key in target (Dept table) like p_key and file:///C|/Perl/bin/result.html (318 of 363)4/1/2009 7:50:59 PM


version field dno field and loc field is there then

select a.p_key a.dno a.loc a.version from t_dept a where a.version (select max(b.version) from t_dept b where a.dno b.dno)

this is the query if you write in lookup it retrieves latest (max) version in lookup from target. in this way performance increases.

======================================= Select Acct.* Rank() Over ( partition by ch_key_id order by version desc) as Rank from Acct where Rank() 1 ======================================= select business_key max(version) from tablename group by business_key =======================================

332.Informatica - Explain about Informatica server process that how it works relates to mapping variables?


March 09, 2007 09:52:01 hemasundarnalco


RE: Explain about Informatica server process that how ...



Click Here to view complete document informatica primarly uses load manager and data transformation manager(dtm) to perform extracting transformation and loading.load manager reads parameters and variables related to session mapping and server and paases the mapping parameters and variable information to the DTM.DTM uses this information to perform the datamovement from source to target ======================================= The PowerCenter Server holds two different values for a mapping variable during a session run: ● ●

Start value of a mapping variable Current value of a mapping variable

Start Value The start value is the value of the variable at the start of the session. The start value could be a value defined in the parameter file for the variable a value saved in the repository from the previous run of the session a user defined initial value for the variable or the default value based on the variable datatype. The PowerCenter Server looks for the start value in the following order: 1. 2. 3. 4.

Value in parameter file Value saved in the repository Initial value Default value

Current Value The current value is the value of the variable as the session progresses. When a session starts the current value of a variable is the same as the start value. As the session progresses the PowerCenter Server calculates the current value using a variable function that you set for the variable. Unlike the start value of a mapping variable the current value can change as the PowerCenter Server evaluates the current value of a variable as each row passes through the mapping.

======================================= First load manager starts the session and it performs verifications and validations about variables and manages post session tasks such as mail. then it creates DTM process. this DTM inturn creates a master thread which creates remaining threads. master thread credtes read thread file:///C|/Perl/bin/result.html (320 of 363)4/1/2009 7:50:59 PM


write thread transformation thread pre and post session thread etc... Finally DTM hand overs to the load manager after writing into the target

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333.Informatica - What are the types of loading in Informatica?


#1

Hanu Ch Rao RE: What are the types of loading in Informatica? Click Here to view complete document Hi In Informatica there are mainly 2 types of loading is there. 1. Normal 2. Bulk you say and one more Incremental Loading. Normal means it loads record by record and writes logs for that. it takes time. Bulk load means it loads number of records at a time to target - it ignores logs ignores tracing level. It takes less time to load data to target. Ok... ======================================= 2 type of loading 1. Normal 2. Bulk Normal loading creates database log it is very slow Bulk loading by passes the database log it is very fast it disable the constraints. ======================================= file:///C|/Perl/bin/result.html (321 of 363)4/1/2009 7:50:59 PM


Hanu I agree with you. You told about Incremental Loading. Can u please let me know in detail about this type of Loading?????? Thanks in advance.......... ======================================= Loadings are 3 types 1. One time data loading 2. Complete data loading 3. Incremental loading ======================================= Two Types Normal :Data retrival is very easy it creates a index Bulk : Data retrival is not possible it stores the data in improperway =======================================

334.Informatica - What are the steps involved in to get source from OLTP system to staging area

QUESTION #334 No best answer available. Please pick the good answer available or submit your answer. March 13, 2007 16:56:07 reddy RE: What are the steps involved in to get source from ...


#1


Click Here to view complete document Data Profile Data Cleanching is used to verify the data types ======================================= Hi Reddy Could you tell me what do u mean by DATA PROFILE? Thanks in advance.. ======================================= go to source analyzer import databases go to warehouse designer import databases (target definitions) else create using generate sql go to mapping designer drag and drop sources and targets definitions link ports properly save to repository than q

=======================================

335.Informatica - What is use of event waiter?


March 05, 2007 12:38:14 sreedhark26 RE: What is use of event waiter?




Click Here to view complete document ● Event-Wait task. The Event-Wait task waits for an event to occur. Once the event triggers the PowerCenter Server continues executing the rest of the workflow. ======================================= event wait is of two type 1> predefine event: this type of event wait for the indicator file to trigger it.. 2> user define event: this type of event wait for the event raise to trigger the event. thanks ravinder ======================================= Event Wait task is a file watcher. when ever a trigger file is touched/created this task will kick off the rest of the sessions to execute which are there in the batch. I used only User defined Event wait task. ======================================= Event wait: will hold the workflow until it is get other instruction or delay mentioned by the user Cheers Sithu [email protected] =======================================

336.Informatica - which transformation can perform the non equi join?

QUESTION #336 No best answer available. Please pick the good answer available or submit your answer. March 12, 2007 01:47:43 kasireddy RE: which transformation can perform the non equi join...


#1


Click Here to view complete document Hi Lookup transformation. ======================================= Here look up not supports outer join And supports non equijoin Joiner supports outer join not non equi ======================================= Lookup only can do non equi join joiner does only outer detail outer and master outer joins. ======================================= It is Lookup Cheers Sithu [email protected] =======================================

337.Informatica - Which objects cannot be used in a mapplet transformation

QUESTION #337 No best answer available. Please pick the good answer available or submit your answer. March 07, 2007 08:35:11 tirumalesh RE: Which objects cannot be used in a mapplet transfor...


#1


Click Here to view complete document Non-Reusuable Sequence generator cannot be used in maplet.

======================================= ● You cannot include the following objects in a mapplet: ● ● ● ● ● ● ●

Normalizer transformations Cobol sources XML Source Qualifier transformations XML sources Target definitions Pre- and post- session stored procedures Other mapplets

======================================= When you add transformations to a mapplet keep the following restrictions in mind: ♦If you use a Sequence Generator transformation you must use a reusable Sequence Generator transformation. ♦If you use a Stored Procedure transformation you must configure the Stored Procedure Type t o b e Normal. ♦You cannot include PowerMart 3.5-style LOOKUP functions in a mapplet. ♦You cannot include the following objects in a mapplet: −Normalizer transformations −COBOL sources −XML Source Qualifier transformations −XML sources −Tar ge t d e f i ni t i ons −Other mapplets =======================================

Joiner Transfermation Normalizer transformations Cobol sources XML Source Qualifier transformations XML sources ●

Target definitions


file:///C|/Perl/bin/result.html ● ●

Pre- and post- session stored procedures Other mapplets

======================================= We can not use the following objects/ transformations in the mapplet =======================================

338.Informatica - How to do aggregation with out using AGGREGAROR Transformation ?


March 09, 2007 09:37:56 hemasundarnalco


RE: How to do aggregation with out using AGGREGAROR Tr... Click Here to view complete document write a sql qurey to perform an aggregation in the source qualifier transformation ======================================= Overwrite the SQL Query at Source Qualifier transformation

=======================================

339.Informatica - how do you test mapping and what is associate port?




RE: how do you test mapping and what is associate port...



Click Here to view complete document hi U can test mapping in mapping Designer by using debugger. In Debugger u can test first instance and next instance. associated port is output port. sreedhar ======================================= specifying the number of test load rows in the session properties. =======================================

340.Informatica - Why can't we use normalizer transformation in mapplet?




RE: Why can't we use normalizer transformation in mapp... Click Here to view complete document Hi Nt is using for cobol sources u can take data in source analyzer automatically displays normalizer transformation. u can not use in mapplet. sreedhar =======================================

341.Informatica - Strategy Transformation

QUESTION #341 By using Update Strategy Transformation we use to maintain historical data using Type2 & Type3. By both of this which is better to use? Why? Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. March 26, 2007 09:12:45


#1


sai RE: Strategy Transformation

======================================= using type 2 u can maintain total historical data along with current data; using type 3 u can maintain only one time historical data and currrent data: dased upon requrirement we have to choose the best suitable. =======================================

342.Informatica - Source Qualifier in Informatica

QUESTION #342 What is the Technical reason for having Source Qualifier in Informatica? Can a mapping be implemented without it? (Please don't mention the functionality of SQ) but the main reason why a mapping can't do without it... Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. March 27, 2007 06:32:28 chowdary RE: Source Qualifier in Informatica

======================================= in informatica source qualifier will read data from sources. for reading data from sources sql is mandatory

======================================= SQ reads data from the sources when the informatica server runs the session. data to the any other transformation is not allowed with out this SQ trans. It has got other qualities also it can be used as a filter. it can be used as a sorter and is also used to select distinct values. it can be used as a joiner if the data is coming from the same source.


#1


======================================= In informatica source qualifier acts as a staging area and it will create its own data types which are related to source data types

=======================================

343.Informatica - what is the difference between mapplet and reusable Transformation?


March 30, 2007 02:38:57 veera_kk


RE: what is the difference between mapplet and reusabl... Click Here to view complete document A set of reusable transformations is called mapplet where as a single reusable transformtion is called reusable transformation. =======================================

344.Informatica - What is the difference between SQL Overriding in Source qualifier and Lookup transformation?


April 08, 2007 11:10:38 ggk.krishna


RE: What is the difference between SQL Overriding in ...



Click Here to view complete document Hi 1. In LOOKUP SQL override if you add or subtract ports from the SELECT statement the session fails. 2. In LOOKUP if you override the ORDER BY statement the session fails if the ORDER BY statement does not contain the condition ports in the same order they appear in the Lookup condition ======================================= You can use SQL override in lookup if you have 1. More than one look up table 2. If you use where condition to reduce the records in the cache. ======================================= If you write a query in source qualifier(to override using sql editor) and press validate you can recognise whether the querry written is right or wrong. But in lookup override if the querry is wrong and if you press validate button.You cannot recognise but when you run a session you will get error message and session fails =======================================

345.Informatica - How can you call trigger in stored procedure transformation


May 07, 2007 22:54:43 hanug


RE: How can you call trigger in stored procedure trans...



Click Here to view complete document Hi: Trigger can not be called from Stored procedure. Trigger will execute implicitly when u are performing DML operation on the table or view(instead of views). U can get the difference between trigger and sp anywhere in the doc. Hanu.

=======================================

346.Informatica - How to assign a work flow to multiple servers? QUESTION #346 I have multiple servers, I want to assign a work flow to multiple servers Click Here to view complete document

No best answer available. Please pick the good answer available or submit your answer. October 19, 2007 15:08:36

#1

krishna RE: How to assign a work flow to multiple servers?

======================================= Informatica server will use Load manager process to run the workflow load manager will do assign the workflow process to the multiple servers.

=======================================

347.Informatica - what types of Errors occur when you run a session, can you describe them with real time example



#1


kasisarath


RE: what types of Errors occur when you run a session, can you describe them with real time example Click Here to view complete document There are several errors you will get. Couple of them are 1. if informatica failed to connect data base 2. If source file not eixsts in location 3. If paramerters not initilized with parameter file 4. incompataible piped data types etc. =======================================

348.Informatica - how do you add and delete header , footer records from flat file during load to oracle?


#1

Abhishek RE: how do you add and delete header , footer records ... Click Here to view complete document We can add header and footer record in two ways. 1) Within the informatica session we can sequence the data as such that the header flows in first and footer flows in last. This only holds true when you have the header and footer the same format as the detail record. 2) As soon as the sesion to generate detail record file finishes we can call unix script or unix command through command task which will concat the header file detail file and footer file and generrate the required file =======================================

349.Informatica - Can we update target table without using update strategy transformation? why?



#1

May 22, 2007 07:00:56 rahul RE: Can we update target table without using update s... Click Here to view complete document Yes we can update the target table by using the session properties. There are some options in the Session properties. ======================================= using :Tu Targetupdate override. =======================================

350.Informatica - How to create slowly changing dimension in informatica?


May 07, 2007 23:02:45 hanug


RE: How to create slowly changing dimension in informa... Click Here to view complete document We can create them manually or use the slowly changing dimension wizard to avoid the hassels. Use slowly changing dimension wizard and make necessary changes as per your logic. Hanu. =======================================

351.Informatica - What are the general reasons of session failure with Look Up having Dynamic Cache?


April 24, 2007 15:52:27 shanthi1




RE: What are the general reasons of session failure wi... Click Here to view complete document hi If u r using dynamic lookup and if it is trying to return more than one value then session fails =======================================

352.Informatica - what is the difference between source qualifier transformation and filter transformation?


April 24, 2007 15:59:43 shanthi1


RE: what is the difference between source qualifier tr... Click Here to view complete document There is no SQL override in FILTER where as in Source Qualifier we have SQL override and also in SQ transformation we have options like SELECT DISTINCT JOIN FILTER CONDITIONS SORTED PORTS etc... ======================================= In Source Qualifier we can filter records from different source systems(Relational or Flatfile). In Filter Transformation we will filter those records which we need to update or proceed further. In simple before Filter Transformation the data from source system may or may not be processed (ExpressionTransformation etc...). ======================================= By using source qualifier transfomation we can filter out the records for only relational sources but by using Filter Transformation we can filter out the records of any source..

======================================= By using Source Qualifier we can filter out records from only relational sources. But by using Filter Transformation we can filter out records from any sources. In Filter Transformation we can use any expression to prepare filter condition which evaluates to TRUE or FALSE. The same cannot be done using Source Qualifier. ======================================= A Source Qualifier transformation is the starting point in the mapping where in we are bringing the file:///C|/Perl/bin/result.html (335 of 363)4/1/2009 7:50:59 PM


incoming data or the source data is extracted from this transformation after connecting to the source data base. A filter transformation is a transformation which is placed in the mapping pipe line in order to pass the data to the data following some specific conditions that has to be followed by the passing records. Of course the same purpose can be solved by the Source Qualifier transformation if this is extracting data from a relational source where as if the data is going to be extracted from a flat file then we cannot do it using source qualifier. =======================================

353.Informatica - How do you recover a session or folder if you accidentally dropped them?


May 07, 2007 22:58:05 hanug


RE: How do you recover a session or folder if you acci... Click Here to view complete document u can find ur backup and restore from the backup. If u dont have backup u lost everything. u cant get it back. Thats why we should always take the backup of the objects that we create. Hanu.

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354.Informatica - How do you automatically execute a batch or session?


May 07, 2007 22:51:18 hanug




RE: How do you automatically execute a batch or sessio... Click Here to view complete document u can use the scripting(either UNIX shell or Windows Dos scripting) and then schedule the script. Hanu. =======================================

355.Informatica - What is the best way to modify a mapping if the target table name is changed?


#1

yuva010 RE: What is the best way to modify a mapping if the ta... Click Here to view complete document There is no as such best way but you have to incorporate following steps 1. Change the name in Mapping Designer 2. Refresh mapping with right click on session 3. Reset the target connections. 4. Save. =======================================

356.Informatica - what is homogeneous transformation?

QUESTION #356 No best answer available. Please pick the good answer available or submit your answer. May 11, 2007 18:57:56 vinod madala RE: what is homogeneous transformation?


#1


Click Here to view complete document Pulling the data from same type of sources using a same database link is called Homogenous. The key word is same databse link (thats the system DSN we use). =======================================

357.Informatica - If a Mapping is running slow, What steps you will take, to correct it?


May 11, 2007 19:05:32 vinodh259


RE: If a Mapping is running slow, What steps you will ... Click Here to view complete document provide optimizer hints to the informatica. such as force informatica to use indexes synonyms etc .. best technique is find ehich trnsformation is makin the mapping slow and with that logic build a query in the databse and see how the database executing plan. to see the plan how database executing plan for example EXPLAIN PLAN command in oracle helps u . for more information try help topics in power designer. in help lookfor optimizing hints =======================================

358.Informatica - How can you join two tables without using joiner and sql override transformations?


May 07, 2007 22:48:49 hanug


RE: How can you join two tables without using joiner a...



Click Here to view complete document U can use the Lookup Transformation to perform the join. Here u may not get the same results as SQL OVERRIDE(data coming from same soure) or Joiner(same source or different sources) because it takes single record in case of multi match If one of the table contains single record u dont need to use SQL OVERRIDE or Joiner to join records. Let it perform catesion product. This way u dont need to use both(sql override joiner) Hanu. ======================================= you can join two tables with in the same database by using lookup query override ======================================= If the sources are homogenous we use source qualifier if the sources have same structure we can use union transformation =======================================

359.Informatica - What does Check-In and Check-Out option refer to in the mapping designer? QUESTION #359 No best answer available. Please pick the good answer available or submit your answer. #1

May 15, 2007 11:21:21 ramgan_tryst


RE: What does Check-In and Check-Out option refer to i... Click Here to view complete document Check-In and Check-Out refers to Versioning your Mapping. It is like maintaining the changes you have made. It is like using VSS or CVS. When you right-click you mapping you have a option called Versioning if you have got that facility enabled. =======================================

360.Informatica - Where and Why do we use Joiner Cache?

QUESTION #360 No best answer available. Please pick the good answer available or submit your answer. June 28, 2007 04:57:02 mohammed haneef


#1


RE: Where and Why do we use Joiner Cache? Click Here to view complete document Hi Joiner Cache will use in Joiner t/r to improve the performance. While using joiner cache informatica server first read the data from master source and built data index & data cache in the master rows. After building the cache joiner t/r reads records from detail source to performs joins. =======================================

361.Informatica - where does the records goes which does not satisfy condition in filter transformation?


July 06, 2007 05:14:44 pkonakalla


RE: where does the records goes which does not satisfy... Click Here to view complete document It goes to the default group. If you connect default group to an output the powercenter processes the data. Otherwise it doesnt process the default group.

======================================= The rows which are not satisfing the filter transformation are discarded. It does not appear in the session logfile or reject files.

======================================= There is no default group in Filter Transformation. The records which does not satisfy filter condition are discarded and not written to reject file or session log file =======================================

362.Informatica - How can we access MAINFRAME tables in INFORMATICA as a source ? file:///C|/Perl/bin/result.html (340 of 363)4/1/2009 7:50:59 PM


QUESTION #362 ex-: Suppose a table EMP is in MAINFRAME then how can we access this table as SOURCE TABLE in informatica? Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

May 26, 2007 14:32:55 vishnukirank


RE: How can we access MAINFRAME tables in INFORMATICA...

======================================= Use Informatica Power Connect to connect to external systems like Mainframes and import the source tables. ======================================= Use the Normalizer transformation to take the Mainframe sources(COBOL) =======================================

363.Informatica - How to run a workflow without using GUI i.e, Worlflow Manager, Workflow Monitor and pmcmd?


August 03, 2007 03:56:21 balaetl


RE: How to run a workflow without using GUI i.e, Worlf...



Click Here to view complete document pmcmd is not GUI. It is a command you can use within unix script to run the workflow. ======================================= Unless the job is scheduled you cannot manually run a workflow without using a GUI.

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364.Informatica - How to implement de-normalization concept in Informatica Mappings?


January 24, 2008 19:04:25 kasisarath


RE: How to implement de-normalization concept in Informatica Mappings? Click Here to view complete document User Normalizer. This transformation used to normalize data. =======================================

365.Informatica - What are the Data Cleansing Tools used in the DWH?What are the Data Profiling Tools used for DWh?

QUESTION #365 No best answer available. Please pick the good answer available or submit your answer. June 21, 2007 04:23:27 Shashikumar RE: What are the Data Cleansing Tools used in the DWH?...


#1


Click Here to view complete document Data Cleansing Tool: Trilium Profile tool: Informatica Profiler =======================================

366.Informatica - how do you use Normalizer to convert columns into rows ?


February 18, 2008 03:47:43 Deepak Rajkumar


RE: how do you use Normalizer to convert columns into rows ? Click Here to view complete document Using Normalizer in the normalizer properties we can add coloumns and for a coloumn we can specify the occurance levels which converts rows into coloumns. =======================================

367.Informatica - how to use the shared cache feature in look up transformation

QUESTION #367 No best answer available. Please pick the good answer available or submit your answer. September 28, 2007 11:26:00 chandrarekha RE: how to use the shared cache feature in look up tra...


#1


Click Here to view complete document If you are using single lookup and you are using only for reading tha data you can use satatic cache ======================================= Instead of creating multiple cache files informatica server creates only one cache file for all the lookups used with in the mapping which selected as a shared cache option. =======================================

368.Informatica - What is Repository size, What is its min and max size?


#1

chandrarekha RE: What is Repository size, What is its min and max ... Click Here to view complete document 10GB =======================================

369.Informatica - What will be the way to send only duplicate records to the Target?

QUESTION #369 No best answer available. Please pick the good answer available or submit your answer. July 23, 2007 08:23:22 Samir Desai RE: What will be the way to send only duplicate record...


#1


Click Here to view complete document You can use following query in SQ --> Select Col_1 Col_2 Col..n from source group by Col_1 Col_2 Col..n having count(*)>1 to get only duplicate records in the traget.

Best Regrads Samir Desai.

======================================= If you take a ex:EMP TABLE having the duplicate records The query is SELECT *FROM EMP WHERE EMPNO IN SELECT EMPNO FROM EMP GROUP BY EMPNO HAVING COUNT(*)>1; Sanjeeva Reddy =======================================

370.Informatica - What are the Commit & Commit Intervals?


July 31, 2007 13:05:53 rasmi


RE: What are the Commit & Commit Intervals? Click Here to view complete document Commit interval is a interval in which the Informatica server loads the data into the target. =======================================

371.Informatica - Explain Session Recovery Process?



#1

September 28, 2007 11:21:50 chandrarekha RE: Explain Session Recovery Process? Click Here to view complete document You have 3 steps in session recovery If Informatica server performs no commit run the session again At least one commit perform recovery perform recovery is not possible truncate the target table and run the session again.

Rekha ======================================= hi when the informatica server starts a recovery session it reads the opb_srvr_recovery table and notes the rowid of the last row commited to the target database. when it starts recovery process again it starts from the next row_id. if session recovery should take place atleast one commit must be executed.

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372.Informatica - Explain pmcmd?


July 31, 2007 11:54:03 rasmi RE: Explain pmcmd?




Click Here to view complete document 1. Pmcmd is perform following tasks 1.start and stop the sessions and batches 2.process the sesson recovery 3.stop the informatica server 4.check whether informatica server working or not.

======================================= pmcmd means powermart command prompt which used to perform the tasks from command prompt and not from Informatica GUI window

======================================= It a command line program. It performs the following tasks Start and stop the session and batches Stop the Informatica Server Checks whether the server is working or not ======================================= hi PMCMD means program command line utility. it is a program command line utility to communicate with informatica server. PMCMD performs following tasks 1)start and stop batches and sessions 2)recovery sessions 3)stops the informatica 4)schedule the sessions by shell scripting 5)schedule the sessions by using operating system schedule tools like CRON =======================================

373.Informatica - What does the first column of bad file (rejected rows) indicate? Explain



September 24, 2007 14:24:17

#1

chandrarekha RE: What does the first column of bad file (rejected r... Click Here to view complete document First column of the bad file indicates row -indicator and second column indicates column indicator Row indicator : Row indicator tells the writer what to do with the row of wrong data Row indicator meaning rejected by 0 Insert target/writer 1 update target/writer 2 delete target/writer 3 reject writer If the row indicator is 3 the writer rejects the row because the update starategy expression is marked as reject =======================================

374.Informatica - What is the size of data mart?

QUESTION #374 No best answer available. Please pick the good answer available or submit your answer. August 22, 2007 05:24:31 hpadala RE: What is the size of data mart?


#1


Click Here to view complete document Datamart size around 1 gb. its based on your project. ======================================= Hi Data mart is a part of the data warehouse.for example In an organization we can manage Employee personal information as one data mart and Project information as one data mart one data ware house may have any number of data marts.The size of the data mart depends on your business needs it varies business to business. some times OLTP database may act as data mart for ware house. Cheers Thana =======================================

375.Informatica - What is meant by named cache?At what situation we can use it?


August 24, 2007 13:54:43 sn3508


RE: What is meant by named cache?At what situati... Click Here to view complete document By default there will be no name for the cache in lookup transformation. Everytime you run the session the cache will be rebuilt. If you give a name to it it is called Persistent Cache. In this case the first time you run the session the cache will be build and the same cache is used for any no. of runs. This means the cache doesn't have any changes reflected to it even if the lookup source is changed. You can rebuilt it again by deleting the cache

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376.Informatica - How do you define fact less Fact Table in Informatica



#1

September 18, 2007 00:30:12 ramakrishna RE: How do you define fact less Fact Table in Informat... Click Here to view complete document A Fact table with out measures is called fact less fact table ======================================= Fact table without measure is called factless fact table fact less fact tables are used to capture date transaction events =======================================

377.Informatica - what are the main issues while working with flat files as source and as targets ?


February 06, 2008 09:25:16 rasmi


RE: what are the main issues while working with flat files as source and as targets ? Click Here to view complete document We need to specify correct path in the session and mension either that file is 'direct' or 'indirect'. keep that file in exact path which you have specified in the session . -regards rasmi

======================================= 1. We can not use SQL override. We have to use transformations for all our requirements 2. Testing the flat files is a very tedious job 3. The file format (source/target definition) should match exactly with the format of data file. Most of the time erroneous result come when the data file layout is not in sync with the actual file. (i) Your data file may be fixed width but the definition is delimited----> truncated data (ii) Your data file as well as definition is delimited but specifying a wrong delimiter (a) a delimitor file:///C|/Perl/bin/result.html (350 of 363)4/1/2009 7:50:59 PM


other than present in actual file or (b) a delimiter that comes as a character in some field of the file-->wrong data again (iii) Not specifying NULL character properly may result in wrong data (iv) there are other settings/attributes while creating file definition which one should be very careful 4. If you miss link to any column of the target then all the data will be placed in wrong fields. That missed column wont exist in the target data file.

Please keep adding to this list. There are tremendous challenges which can be overcome by being a bit careful.

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378.Informatica - When do you use Normal Loading and the Bulk Loading, Tell the difference?


#1

rama krishna RE: When do you use Normal Loading and the Bulk Loadin... Click Here to view complete document If we use SQL Loder connections then it will be to go for Bulk loading. And if we use ODBC connections for source and target definations then it is better to go for Normal loading. If we use Bulk loading then the session performence will be increased. how means... if we use the bulk loading the data will be BYPASS through the DATALOGS. So automatically performence will be increased.

======================================= Normal Load: It loads the records one by one Server writes log file for each record So it takes more time to load the data. Bulk load : It loads the number of records at a time it does not write any log files or tracing levels so it takes less time. ======================================= You would use Normal Loading when the target table is indexed and you would use bulk loading when file:///C|/Perl/bin/result.html (351 of 363)4/1/2009 7:50:59 PM


the target table is not indexed. Running Bulk Load in an indexed table will cause the session to fail. =======================================

379.Informatica - What is key factor in BRD?


January 24, 2008 19:05:37 kasisarath


RE: What is key factor in BRD? Click Here to view complete document could you please eloborate what is BRD =======================================

380.Informatica - how do you measure slowly changing dimensions using lookup table


September 24, 2007 13:41:04 vemurisasidhar


RE: how do you measure slowly changing dimensions usin... Click Here to view complete document the lookup table is used to split the data by comparing the source and target data. the data is branched accordingly whether to update or insert =======================================

381.Informatica - Have you implmented Lookup in your mapping, If yes give some example?



#1


vemurisasidhar


RE: Have you implmented Lookup in your mapping, If yes... Click Here to view complete document we do. we have to update or insert a row in the target depending upon the data from the sources. so inorder to split the rows either to update or insert into the target table we use the lookup transformation in reference to target table and compared with source table.

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382.Informatica - Which SDLC suits best for the datawarehousing project.


September 12, 2007 17:28:25 anjanroy


RE: Which SDLC suits best for the datawarehousing proj... Click Here to view complete document Datawarehousing projects are different from the traditional OLTP project. First of all they are ongoing. A datawarehouse project is never "complete". Here most of the time the business users would say "give us the data and then we will tell you what do we want". So here a traditional waterfall model is not the optimal SDLC approach. The best approach here is of a phased iteration - where you implement and deliver projects in small manageable chunks (90 days ~ 1 qtr) and keep maturing your data warehouse.

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383.Informatica - What is the difference between source definition database and source qualifier?



answer. #1



RE: What is the difference between source definition d... Click Here to view complete document a source definition database contain the datatypes that are used in the orginal database from which the source is extracted. where the source qualifier is used to convert the source definition datatypes to the informatica datatypes. which is easy to work with. =======================================

384.Informatica - What is the logic will you implement to load data into a fact table from n dimension tables?




RE: What is the logic will you implement to load data ... Click Here to view complete document we can do this by using mapping wizard. there are of basically two types: 1)getting started wizzard 2)scd gettign started wizard is used when there is no need to change the previous data. scd can hold the historical data.

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385.Informatica - What is a Shortcut and What is the difference between a Shortcut and a Reusable Transformation?



answer. #1

January 29, 2008 23:32:01 Sant_parkash


RE: What is a Shortcut and What is the difference between a Shortcut and a Reusable Transformation? Click Here to view complete document A Reusable Transformation can only be used with in the folder. but a shortcut can be used anywhere in the Repository and will point to actual Transformation.. ======================================= to add to this the shortcut points to objects of shared folder only ======================================= A shortcut is a reference (link) to an object in a shared folder these are commonly used for sources and targets that are to be shared between different environments / or projects. A shortcut is created by assigning 'Shared' status to a folder within the Repository Manager and then dragging objects from this folder into another open folder; this provides a single point of control / reference for the object multiple projects don't all have import sources and targets into their local folders. A reusable transformaion is usually something that is kept local to a folder examples would be the use of a reusable sequence generator for allocating warehouse Customer Id's which would be useful if you were loading customer details from multiple source systems and allocating unique ids to each new source-key. Many mappings could use the same sequence and the sessions would all draw from the same continuous pool of sequence numbers generated. =======================================

386.Informatica - In what all transformations the mapplets cant be used in informatica?? QUESTION #386 No best answer available. Please pick the good answer available or submit your answer. October 06, 2007 17:50:21 naina RE: In what all transformations the mapplets cant be u...


#1


Click Here to view complete document The mapplets cant use these following transformations xml source qualifier normalizer non-reusable sequence generator (it can use only reusable sequence generator) =======================================

387.Informatica - Eliminate Duplicate Records QUESTION #387 Hi

I am having 10000 records in flat file, in that there are 100 records are duplicate records.. soo we want to eliminate those records..which is the best method we have to follow. Regards Mahesh Reddy Click Here to view complete document Submitted by: vivek1708 In order to beable to delete those entries I think, you'll have to write sql queries in teh data base table using rownum/rowid concept. Or by using the sorter and distinct option, load the unique rows in a temp table followed by a truncate on the original table and moving data back to it from the temp table. hope it helps. Above answer was rated as good by the following members: ayappan.a ======================================= You can put sorter transformation after source qualifier transformation and in sorter tranformation' properties enable distinct property. Thanks kumar =======================================



In order to beable to delete those entries I think you'll have to write sql queries in teh data base table using rownum/rowid concept. Or by using the sorter and distinct option load the unique rows in a temp table followed by a truncate on the original table and moving data back to it from the temp table. hope it helps. ======================================= use aggregate on primary keys =======================================

388.Informatica - what is the difference between reusable transformation and mapplets?


November 20, 2007 03:19:32 ramesh raju RE: what is the difference between reusable transforma... Click Here to view complete document Reusable transformation is a single transformatin which can be resuable & mapplet is a set of transformations which can be reusable. =======================================

389.Informatica - What is the functionality of Lookup Transformation

QUESTION #389 (connected & un connected) Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

November 17, 2007 06:59:15 Thananjayan




RE: What is the functionality of Lookup Transformation...

======================================= Look up transformation compares the soure with specified target table and forwarded the records to next tranformation only matched records.If not match it returns NULL

=======================================

390.Informatica - How do you maintain Historical data and how to retrieve the historical data?


#1

ravi RE: How do you maintain Historical data and how to ret... Click Here to view complete document by using update statergy transformations ======================================= You can maintain the historical data by desing the mapping using Slowly changing dimensions types. If you need to insert new and update old data best go for Update strategy. If you need to maintain the histrory of the data for ex The cost of the product change happen frequently but you would like to maintain all the rate history go to SCD Type2. The design change as per your requirement.If you make your question more clear I can provide your more information. Cheers Thana =======================================

391.Informatica - What is difference between cbl (constaint based file:///C|/Perl/bin/result.html (358 of 363)4/1/2009 7:50:59 PM


commit) and target based commit?When we use cbl?


January 16, 2008 01:30:51 say2joshi


RE: What is difference between cbl (constaint based commit) and target based commit?When we use cbl? Click Here to view complete document could u pls clear ur question tht CBL stands for constarint based loading? thanks ======================================= CBL means constaraint based loading.the data was loaded into the the target table based on the Constraints.i.e if we want to load the EMP&DEPT data first it loads the data of DEPT then EMP because DEPT is PARENT table EMP is CHILD table. easily to undestand it loads PARENT table first then CHILD table. =======================================

392.Informatica - Repository deletion

QUESTION #392 what happens when a repository is deleted? If it is deleted for some time and if we want to delete it permanently? where is stored (address of the file) Click Here to view complete document No best answer available. Please pick the good answer available or submit your answer. #1

November 28, 2007 22:36:19 chandrarekha RE: Repository deletion




======================================= I too want to know the answer for this question I tried to delete the repository that time it was deleted after that i tried to create the repository with the same name what i was deleted earliar it is showing the repositort exist in the target we have to delete the repository in the target database ======================================= repository is stored in database go in repository admin console right click on repository then choose delete . a dialog box is displayed fill up the user name(database user wr ur repository is reside) give password and fill all the field .thereafter u can delete it. if any queries plz mail me sajjan.s25@gmail. com =======================================

393.Informatica - What is pre-session and post-session?


November 13, 2007 23:55:12 vizaik


RE: What is pre-session and post-session? Click Here to view complete document Pre-session: =======================================

394.Informatica - What is Informatica basic data flow?

QUESTION #394 No best answer available. Please pick the good answer available or submit your answer. November 20, 2007 07:04:44 Nick RE: What is Informatica basic data flow?


#1


Click Here to view complete document INF Basic Data flow means Extraction Transformation and Loading of data from Source to the target. Cheers Nick

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395.Informatica - which activities can be performed using the repository manager?


#1

karuna RE: which activities can be performed using the reposi... Click Here to view complete document Using Repository manager we can create new folders for the existing repositories and manage the repository from it ======================================= Using repository manager *We can create folders under the repository *Create Sub Folders and Folder Management *Create Users and USer Groups *Set Security/Access Privilges to the users and many more... ======================================= You can use the Repository Manager to perform the following tasks: =======================================

396.Informatica - what is the economic comparision of all the Informatica versions?



#1

April 10, 2008 04:59:08 sri.kal


RE: what is the economic comparision of all the Informatica versions? Click Here to view complete document Version controlling ======================================= Economic comparision is nothing but the price-tag of informatica available versions. =======================================

397.Informatica - why do we need lookup sql override? Do we write sql override in lookup with special aim?


November 13, 2007 23:47:42 vizaik


RE: why do we need lookup sql override? Do we write sq... Click Here to view complete document Yes sql override in lookup used to lookup more than one value from more than one table. ======================================= You can join the data from multiple tables in the same database by using lookup override You can use sql override if 1. To use more than one look up in the mapping 2. You can use SQL override for filtering records in the cache to remove unwanted data

======================================= Lookup override can be used to get some specific records(using filters in where clause) from the lookup table. Adavantages are that the whole table need not be looked up.. =======================================

398.Informatica - What are tracing levels in transformation? QUESTION #398



No best answer available. Please pick the good answer available or submit your answer. November 19, 2007 00:18:10

#1

Abhishek Shukla RE: What are tracing levels in transformation? Click Here to view complete document Tracing level keeps the information aboaut your mapping and transformation. there are 4 kind of tracing level which is responsible for giving more information on basis of their characterictis. Thanks Abhishek Shukla ======================================= Tracing level in the case of informatica specifies the level of detail of information that can be recorded in the session log file while executing the workflow. 4 types of tracing levels supported 1.Normal: It specifies the initialization and status information and summerization of the success rows and target tows and the information about the skipped rows due to transformation errors. 2.Terse specifies Normal + Notification of data 3. Verbose Initialisation : In addition to the Normal tracing specifies the location of the data cache files and index cache files that are treated and detailed transformation statistics for each and every transformation within the mapping. 4. Verbose data: Along with verbose initialisation records each and every record processed by the informatica server For better performance of mapping execution the tracing level should be specified as TERSE Verbose initialisation and verbose data are used for debugging purpose. =======================================


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