3+Years Oracle DBA Tips Questions _ Oracle DBA Tips

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3+ Year s Or acl e D BA Inter vi ew Questi ons | Or acl e D BA ti ps

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3+Years Oracle DBA Interview Questions February 9, 2011 20 11 Mario Alcaide Leave a comment Go to comments In response for a reader of this blog who asked me for some interview questions for a 3+Year experienced DBA, I have written this series of questions that you can use in your interviews. Either if you are the interviewer, or the interviewer. Enjoy! 1. Basic (Every DBA should answer correctly ALL these questions. This knowledge is just basic for a 3+ year experienced DBA) 1.1 Q- Which are the default passwords of SYSTEM/SYS? A- MANAGER MANAGER / CHANGE_ON_INSTAL CHANGE_ON_IN STALL L 1.2 Q- How can you execute a script file in SQLPLUS? A- To execute a script script file in SQLPlus, SQLPlus, type @ and then the file the file name. 1.3 Q- Where can you find official Oracle documentation? A- tahiti tahiti.ora .oracl cle.c e.com om 1.4 Q- What is the address of the Official Oracle Support? A- metalin metalink .oracle.co .oracle.com or sup port.ora port.oraccle.com 1.5 Q- What file will you use to establish Oracle connections from a remote client? A- tnsnam tnsnames.o es.ora ra 1.6 Q- How How can you check check if the database is accepting connections? A- lsnrctl status status or lsnrctl services 1.7 Q- Which log would you check if a database has a problem? A- Alert log 1.8 Q- Name three clients to connect connect with Oracle, for example, SQL Developer: A- SQL SQL Developer, SQL-Plus, TOAD, TOAD, dbvisualizer, PL/SQL Developer… There are several, but an experienced dba should know at least three clients. 1.9 Q- How can you check the structure of a table from sqlplus? A- DESCRIBE or DESC 1.10 Q- What command will you start to run the installation of Oracle software on Linux? A- runInstaller 2. Moderate (Standard knoledge for a daily-work of every DBA. He could fail one or two questions, but not more) 2.1 Q- What should you do if you encounter an ORA-600? mar i oal cai de.wor dpr ess.com/2011/02/09/3year s- i nter vi ew- q uesti ons/

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3+ Year s Or acl e D BA Inter vi ew Questi ons | Or acl e D BA ti ps

A- Contact Oracle Oracle Support 2.2 Q- Ex Explai plain n the the di d ifferences ferences between PFILE PF ILE and SPFILE SPF ILE A- A PFILE is a Static, text file that initialices the database parameter in the moment that it’s started. If you want to modify parameters in PFILE, you have to restart the database. A SPFILE is a dynamic, binary file that allows you to overwrite parameters while the database is already started (with some exceptions) 2.3 Q- In which Oracle version was Data Pump introduced? A- Oracle 10g 2.4 Q- Say two examples of DML, two of DCL and two of DDL A- DML: SELECT, INSERT, UPDATE, DELETE, MERGE, CALL, EXPLAIN PLAN, LOCK TABLE DDL: CREATE, ALTER, DROP, TRUNCATE, COMMENT, RENAME DCL: GRANT, REVOKE 2.5 Q- You want to save the output of an Oracle script from sqlplus. How would you do it? A- spool script_name.txt select * from your_oracle_operations; spool off; 2.6 Q- What is the most important requirement in order to use RMAN to make consistent hot backups? A- Your database has to be in ARCHIVELOG mode. 2.7 Q- Can you connect to a local database without a listener? A- Yes, you can. 2.8 Q- In which view can you find information about every view and table of oracle dictionary? A- DICT or DICTIONARY 2.9 Q- How can you view all the users account in the database? A- SELECT USERNAME FROM DBA_USERS; 2.10 Q- In linux, how can we change which databases are started during a reboot? A- Edit /etc/oratab 3. Advanced (A 3+ year experienced DBA should have enough knowledge to answer these questions. However, depending on the work he has done, he could still fail up to 4 questions) 3.1 Q- When a user process fails, what Oracle background process will clean after it? A- PMON 3.2 Q- How can you reduce the space of TEMP datafile? A- Prior to Oracle 11g, you had to recreate the datafile. In Oracle 11g a new feature was introduced, and you can shrink the TEMP tablespace. 3.3 Q- How can you view all the current users connected in your database in this moment? A- SELECT SELECT COUNT(*),USE CO UNT(*),USERNAME RNAME FROM V$SESSION GROUP GROUP BY USERNAME USERNAME;; 3.4 Q- Explain the differences between SHUTDOWN, SHUTDOWN NORMAL, SHUTDOWN IMMEDIATE AND SHUTDOWN ABORT A- SHUTOWN NORMAL = SHUTDOWN : It waits for all sessions to end, without allowing new connections. SHUTDOWN IMMEDIATE : Rollback current transactions and terminates every session. SHUTDOWN ABORT : Aborts all the sessions, leaving the database in an inconsistent state. It’s the fastest method, but b ut can lead lead to database d atabase corruption. corruption. 3.5 Q- Is it possible to backup your database without the use of an RMAN database to store the catalog? A- Yes, but the catalog would be stored in the controlfile. 3.6 Q- Which are the main components of Oracle Grid Control? A- OMR (Oracle Management Repository), OMS (Oracle Management Server) and OMA (Oracle Management Agent). 3.7 Q- What command will you use to navigate through ASM files? mar i oal cai de.wor dpr ess.com/2011/02/09/3year s- i nter vi ew- q uesti ons/

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3+Years Oracle DBA Interview Questions | Oracle DBA tips

A- asmcmd 3.8 Q- What is the difference between a view and a materialized view? A- A view is a select that is executed each time an user accesses to it. A materialized view stores the result of this query in memory for faster access purposes. 3.9 Q- Which one is faster: DELETE or TRUNCATE? A- TRUNCATE 3.10 Q- Are passwords in oracle case sensitive? A- Only since Oracle 11g. 4. RAC (Only intended for RAC-specific DBAs, with varied difficultied questions) 4.1 Q- What is the recommended method to make backups of a RAC environment? A- RMAN to make backups of the database, dd to backup your voting disk and hard copies of the OCR file. 4.2 Q- What command would you use to check the availability of the RAC system? A- crs_stat -t -v (-t -v are optional) 4.3 Q- What is the minimum number of instances you need to have in order to create a RAC? A- 1. You can create a RAC with just one server. 4.4 Q- Name two specific RAC background processes A- RAC processes are: LMON, LMDx, LMSn, LKCx and DIAG. 4.5 Q- Can you have many database versions in the same RAC? A- Yes, but Clusterware version must be greater than the greater database version. 4.6 Q- What was RAC previous name before it was called RAC? A- OPS: Oracle Parallel Server 4.7 Q- What RAC component is used for communication between instances? A- Private Interconnect. 4.8 Q- What is the difference between normal views and RAC views? A- RAC views has the prefix ‘G’. For example, GV$SESSION instead of V$SESSION 4.9 Q- Which command will we use to manage (stop, start…) RAC services in command-line mode? A- srvctl 4.10 Q- How many alert logs exist in a RAC environment? A- One for each instance. 5. Master (A 3+ year experienced DBA would probably fail these questions, they are very specifid and specially difficult. Be glad if he’s able to answer some of them) 5.1 Q- How can you difference a usual parameter and an undocumented parameter? A- Undocumented parameters have the prefix ‘_’. For example, _allow_resetlogs_corruption 5.2 Q- What is BBED? A- An undocumented Oracle tool used for foresnic purposes. Stans for Block Browser and EDitor. 5.3 Q- The result of the logical comparison (NULL = NULL) will be… And in the case of (NULL != NULL) A- False in both cases. 5.4 Q- Explain Oracle memory structure The Oracle RDBMS creates and uses storage on the computer hard disk and in random access memory (RAM). The portion in the computer s RAM is called memory structure. Oracle has two memory structures in the computer s RAM. The two structures are the Program Global Area (PGA) and the System Global Area (SGA). The PGA contains data and control information for a single user process. The SGA is the memory segment that stores data that the user has retrieved from the database or data that the user wants to place into the marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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database. 5.5 Q- Will RMAN take backups of read-only tablespaces? A- No 5.6 Q- Will a user be able to modify a table with SELECT only privilege? A- He won’t be able to UPDATE/INSERT into that table, but for some reason, he will still be able to lock a certain table. 5.7 Q- What Oracle tool will you use to transform datafiles into text files? A- Trick question: you can’t do that, at least with any Oracle tool. A very experienced DBA should perfectly know this. 5.8 Q- SQL> SELECT * FROM MY_SCHEMA.MY_TABLE; SP2-0678: Column or attribute type can not be displayed by SQL*Plus Why I’m getting this error? A- The table has a BLOB column. 5.9 Q- What parameter will you use to force the starting of your database with a corrupted resetlog? A- _ALLOW_RESETLOGS_CORRUPTION 5.10 Q- Name the seven types of Oracle tables A- Heap Organized Tables, Index Organized Tables, Index Clustered Tables, Hash Clustered Tables, Nested Tables, Global Temporary Tables, Object Tables.

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Categories: DBA's day, Definitions, Interview, Interview questions, oracle Tags: DBA Job, Interview questions, Oracle Comments (75) Trackbacks (0) Leave a comment Trackback

1. Dik Pater April 14, 2011 at 6:08 pm | #1 Reply | Quote Mario, nice article. Adios Dik Pater. The Netherlands.

Mario Alcaide April 15, 2011 at 5:47 am | #2 Reply | Quote Thank you Dik, I’m glad you enjoyed it

marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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2. Ragavendiran April 27, 2011 at 5:58 am | #3 Reply | Quote Good Stuff- Really worthy Thanks, Ragav

3. srikanth April 29, 2011 at 3:14 am | #4 Reply | Quote thank you ….. donw good job u have any new stuff forwarad to me

Mario Alcaide April 29, 2011 at 10:54 am | #5 Reply | Quote I’ve been really busy lately, will try to write new articles ASAP. Thanks for your comments! If you have suggestions of new articles, I listen for you

venkat August 14, 2011 at 4:33 am | #6 Reply | Quote very nice tips , and one more thing is here , iam trying as a 3+ DBA , so plz if ur having the another articals plz forward to me, d real time senarios also thanku very much.

4. Vinodn April 29, 2011 at 10:47 am | #7 Reply | Quote Very useful information! Thanks a lot!!

5. marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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jagmohan May 6, 2011 at 5:33 pm | #8 Reply | Quote thank you very interesting and useful info

6. Tom July 7, 2011 at 2:18 pm | #9 Reply | Quote Thank you, very useful

7. Md.Asif July 11, 2011 at 6:05 pm | #10 Reply | Quote thank u very much Mr.mario……,it is really of great help,can u post some more questions and realtime tools plz

Mario Alcaide July 11, 2011 at 6:59 pm | #11 Reply | Quote Sure Md.Asif, I will update the blog to add some new posts about realtime tools

8. suhail July 13, 2011 at 6:25 am | #12 Reply | Quote i need some more question abut performance tuning …

9. Mohammed Aslam July 24, 2011 at 9:50 am | #13 Reply | Quote very very nice questions

10. sowfeer July 26, 2011 at 5:03 pm | #14 marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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Reply | Quote 2.4 Qusetions answer has some fault In this DCL means Data control langauge, os it must revoke and grant and DDL means Data Defenition language, so tha would be Create, alter,drop etc… But your entry is like this.. DML: SELECT, INSERT, UPDATE, DELETE, MERGE, CALL, EXPLAIN PLAN, LOCK TABLE DCL: CREATE, ALTER, DROP, TRUNCATE, COMMENT, RENAME DDL: GRANT, REVOKE Please Let me know i am right or wrong !

11. Vu July 26, 2011 at 8:19 pm | #15 Reply | Quote I think you got this wrong: 2.4 Q- Say two examples of DML, two of DCL and two of DDL A- DML: SELECT, INSERT, UPDATE, DELETE, MERGE, CALL, EXPLAIN PLAN, LOCK TABLE DCL: CREATE, ALTER, DROP, TRUNCATE, COMMENT, RENAME DDL: GRANT, REVOKE It should be: … DDL: CREATE, ALTER, DROP,… DCL: GRANT, REVOKE Thanks for the list.

Mario Alcaide August 1, 2011 at 10:30 am | #16 Reply | Quote Vu and sowteer: You are right, I made a mistake and misplaced DCL and DDL. It’s already fixed, thank you for your contribution!

Gabriele Villanova October 4, 2012 at 11:26 pm | #17 Quote I think you have forgotten in the DCL statement list ROLLBACK, COMMIT and marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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SAVEPOINT.

12. Farzu Banu August 3, 2011 at 5:57 pm | #18 Reply | Quote Thank you for sharing this tip’s It’s really helpful me for my interview… Keep posted more and more.. so that I could able to explore the things in oracle dba.. Thanks again.. Shruti…

Mario Alcaide August 4, 2011 at 6:14 am | #19 Reply | Quote Contratulations for your successfully interview! I’m glad to have helped you, more tips will come soon

13. G SElvam August 17, 2011 at 3:05 am | #20 Reply | Quote Very good questions and answers…Recenly I attended DBA interview all the HR -Techincal questions are covered here… Thanks

14. kumar August 28, 2011 at 11:23 am | #21 Reply | Quote good in knowledge improvise it a simple overview on database nice

15. MURALIK October 12, 2011 at 6:01 pm | #22 Reply | Quote Thank you, very useful MURALI K FROM INDIA, HYDERABAD.


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rahul September 13, 2012 at 12:00 pm | #23 Reply | Quote hii murali nice to meet you for dba do we need any work experience???

16. HImanshu sharma October 19, 2011 at 12:08 pm | #24 Reply | Quote its very really works please mario if you have an opening for dba as fresher so can you mail me once

17. Halim October 22, 2011 at 5:52 am | #25 Reply | Quote your Question 3.2 Q- How can you reduce the space of TEMP datafile? i just simple use resize command its successful . so why need drop and recreate ? (note:- i a victim of your this such simple question and complex answer, i am 100% sure) your question can be Q- How can you reduce the space of TEMP datafile when it contain used data ? SQL*Plus: Release 11.2.0.1.0 Production on Sat Oct 22 11:37:47 2011 Copyright (c) 1982, 2010, Oracle. All rights reserved. SQL> conn sys@stlbas105 as sysdba Enter password: Connected. SQL> SQL> SQL> SQL> select tablespace_name,USER_BYTES/1024/1024/1024 size_gb from dba_temp_file s; TABLESPACE_NAME SIZE_GB —————————— ———TEMP 12.9990234 SQL> SQL> marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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SQL> SQL> alter database tempfile ‘C:\ORACLE\PRODUCT\10.2.0\ORADATA\STLBAS\TEMP01.DBF’ resize 10g; Database altered. SQL> SQL> SQL> select tablespace_name,USER_BYTES/1024/1024/1024 size_gb from dba_temp_file s; TABLESPACE_NAME SIZE_GB —————————— ———TEMP 9.99902344 SQL> SQL> regards Halim

Mario Alcaide October 24, 2011 at 9:20 am | #26 Reply | Quote Hi Halim, The resize option is only available for TEMPFILES starting in 11g, it’s a new feature. Before 11g, you had to drop and recreate the temp datafile. So your answer would be true only in 11g, but if you are working with 10g or earlier, that won’t work. Thanks for your contribution, I hope the questions were useful to you

dony February 22, 2012 at 9:35 am | #27 Reply | Quote i want to know that your database release?you can tell me?

Shakir May 17, 2012 at 3:55 am | #28 Reply | Quote marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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Thanks

18. Muhammad Arshad Quraishi October 23, 2011 at 4:26 pm | #29 Reply | Quote very good help i got for my interviews

19. akd November 9, 2011 at 10:50 pm | #30 Reply | Quote Thanks……….helped me alot for my interview

Mario Alcaide November 10, 2011 at 7:21 am | #31 Reply | Quote I’m glad I could help you, and I hope you get the job

20. madhavi November 20, 2011 at 11:35 pm | #32 Reply | Quote nice questions pls send me more questions.thank u.

21. sreenivas December 1, 2011 at 7:31 am | #33 Reply | Quote very use ful questions for dba candidates

22. AMIT CHAVDA December 13, 2011 at 9:36 am | #34 Reply | Quote such a nice collection. keep going on.


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florinda January 2, 2012 at 10:59 am | #35 Reply | Quote Please stste more question regarding RMAN

24. nice January 8, 2012 at 8:38 pm | #36 Reply | Quote thnx……..its really very useful

25. veera January 21, 2012 at 9:45 pm | #37 Reply | Quote Nice QA,,,,please send more QA. Veera from Bangalore.

26. Praveen January 24, 2012 at 10:25 am | #38 Reply | Quote Really it helps a lot, I appreciate the questions and answers that was posted by you and please keep it up so that new learners will get to know what escatly is happening with the oracle and all…thank you

27. Vicky February 2, 2012 at 7:50 pm | #39 Reply | Quote Very nice article. Highly appreciated

28. Kiran Sutar February 3, 2012 at 11:32 pm | #40 Reply | Quote Thanks, A lot it really helpful for the interview…

29. dony February 22, 2012 at 9:33 am | #41 Reply | Quote marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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i do a lab,i found that is not right.i do it in the 10g.i found that using resize command its successful . 3.2 Q- How can you reduce the space of TEMP datafile? A- Prior to Oracle 11g, you had to recreate the datafile. In Oracle 11g a new feature was introduced, and you can shrink the TEMP tablespace.

Mario Alcaide January 14, 2013 at 5:13 pm | #42 Reply | Quote In Oracle 10g you can resize the datafile, and reduce it if it’s empty (or at least, the part that you want to release isn’t being used). However, in Oracle 11g, you can make a shrink like in a regular datafile, so you can use free blocks and reduce them. Anyway, I think that both our answers would be correct, if you say and make an explanation in an interview.

30. sreenu February 23, 2012 at 7:27 am | #43 Reply | Quote Manya many thanx, and please send me many more Q&A.. if u know openings in Oracle DBA, plz intimate [email protected]

31. sudhakarreddy February 28, 2012 at 2:38 pm | #44 Reply | Quote which is faster DELETE ,TRUNCATE? ANS:DELETE the data temporarly we can rollback those data again so that it deletes from segment/table. TRUNCATE: permnetly delete the data from OS blocks.you can’t rollback that data ….so that truncate takes little bit of time than delete..

32. pallave March 3, 2012 at 11:52 am | #45 Reply | Quote Thanku….


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Debojyoti Roy March 20, 2012 at 12:32 pm | #46 Reply | Quote Hi All, This is a nice site, It would be highly appreciated, if you kindly give some more oracle database related questions , so that , I can bounce back my knowledge level. Thanks in advance , Regards, Debojyoti

34. abdul wajeed March 22, 2012 at 6:48 am | #47 Reply | Quote wow it’s cool.i’m so happy about this courage.it helps alot for every one.if u have more q&a then pls mail me

35. debojyoti April 21, 2012 at 11:30 am | #48 Reply | Quote It’s a great blog , just wanted to request , if you give some more sample questions , live situations based, i believe , it would be highly appreaciated . Thank you , Debojyoti

36. piyush April 27, 2012 at 12:47 pm | #49 Reply | Quote good work

37. Rakesh Monga May 30, 2012 at 7:17 am | #50 Reply | Quote marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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Very Excellent article

38. shrikant suvarnkar May 30, 2012 at 12:15 pm | #51 Reply | Quote thanks it is really good I am stuck on this question can you please answer my questions what is mean by hit ratio in oracle ?

39. A Rahim Khan June 29, 2012 at 6:20 am | #52 Reply | Quote excellent article

40. M.V.Murugesan July 5, 2012 at 7:05 am | #53 Reply | Quote this article gives basics of oracle dba. i want more.

41. Abdul Munthaqueen Mohammed July 10, 2012 at 6:28 pm | #54 Reply | Quote Thanks very excellent

42. vaman July 15, 2012 at 7:57 am | #55 Reply | Quote very usefull for dba cader

43. SHALINI.G July 24, 2012 at 7:23 am | #56 Reply | Quote good questions. thank u so much for helping me out. marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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44. Bashir Ahamad August 4, 2012 at 1:11 pm | #57 Reply | Quote Excellent !!

45. venky September 12, 2012 at 7:21 am | #58 Reply | Quote very nice material………..

46. Dilip Reddy October 2, 2012 at 6:08 am | #59 Reply | Quote Thank you very much.

47. durgarao November 1, 2012 at 8:06 am | #60 Reply | Quote really worty

48. santosh November 7, 2012 at 3:45 pm | #61 Reply | Quote very nice dba interview questions but these are very easy one plstry to post some difficult questions

49. bhaskar November 8, 2012 at 11:09 am | #62 Reply | Quote Hi, This is Bhaskar, i want answer for one question…that is How do know that database has crashed? please help…me…any one… marioalcaide.wordpress.com/2011/02/09/3years-interview-questions/

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50. Screwing gender that includes bisexual girl sizeable cocks leader investigate November 18, 2012 at 3:16 pm | #63 Reply | Quote Wow, awesome blog layout! How long have you ever been blogging for? you make running a blog glance easy. The overall look of your site is excellent, let alone the content material!

51. syed November 18, 2012 at 5:54 pm | #64 Reply | Quote Thanks for such a valuable share

52. amaz December 4, 2012 at 1:22 pm | #65 Reply | Quote Really a bunch of nice questions which is more likely to be asked while facing DBA interview,i hv been asked the concept of LOCKING related with concurrent transaction..im happy i answered correctly

53. Jai December 5, 2012 at 6:40 am | #66 Reply | Quote Thanks for your info…its really useful to me…………

54. ajeet December 7, 2012 at 10:43 am | #67 Reply | Quote Thanks very good oracle questions .

55. VASUDEVAN December 29, 2012 at 7:20 am | #68 Reply | Quote good questions


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56. ramesh valavala December 29, 2012 at 3:53 pm | #69 Reply | Quote nice article…

57. amar January 9, 2013 at 2:55 pm | #70 Reply | Quote Hi sir in showdown process we have another option called SHUTDOWN TRANSATIONAL may be you missed it thanking u sir for stuff…………..

ram January 22, 2013 at 2:22 pm | #71 Reply | Quote Good collection of ques,is there any jobs for 1year experienced,please send to my mail about dba jobs & dba interview questions [email protected] thank u

58. mohan January 17, 2013 at 7:36 am | #72 Reply | Quote thanq..

59. Sravankumar Reddy February 5, 2013 at 3:02 am | #73 Reply | Quote hi if u have interview questions for freshers & exp can u forward me

60. Sravankumar Reddy February 5, 2013 at 3:03 am | #74 Reply | Quote any dba vacancies means pls inform me’


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Mohanraj February 22, 2013 at 11:31 am | #75 Reply | Quote very nice tips , and one more thing is here , Am trying as a 3+ DBA , so plz if ur having the another articles plz forward to me, the real time scenarios also. And if there is any Oracle DBA openings plz let me know. 1. No trackbacks yet.

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