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Cheat Sheet for Informatica Join and LookUp - Best practices & techniques Joshy George | Jun 27, 2009 | Comments (2)
Cheat Sheet for INFA Join / LookUp
Cheat Sheet for Informatica Join and Look Up on performance tuning, best practices, techniques, Dynamic Cache, Persistent Cache, Share Cache, CDC, sql override... For every scenario what to use and how to optimize, see the table here: C
Best Option
A
Second Best Option
D
Not Suggested
Feature Join More records C Get multiple records in a C 1-n LookUp or Join Return Value in case of NULL no match Static Cache
N/A
Dynamic Cache
N/A
Persistent Cache
N/A
Share same LookUpmultiple times in same mapping / session.
N/A
LookUp - Connected D D
LookUp – Unconnected D D
Default or 0
NULL, No default allowed [Can do this in expressions] C Specifies data does not C Specifies data does not change. change DUnconnected is not C Provides current / update lookup connected to the pipeline to from lookup source and also provides provide updates to the cache to values associated for new, existing make it dynamic. You can still and update. NOTE: This once selected access shared cache with same cannot be reverted. port structure. C Indicates your intention to use this C Indicates your intention to lookup later. Goes with Static or use this lookup later. Dynamic Cache. CUnPersistent UnNamed Cache can be CBy default you can reused multiple times in same mapping. NOTE: You cannot share an unnamed dynamic cache. If two Lookup transformations share a static cache, the Integration Service does not allocate additional memory for shared transformations in the same pipeline stage. For shared transformations in different pipeline stages, the Integration Service does allocate additional memory. Warning: Regardless of specified output ports, you have to drag the outputs specified to next transformation; else reload of cache will happen which is not good.
Share same LookUpmultiple times in multiple sessions
N/A
Persistent Named Cache can be reused multiple times in same mapping. & across in multiple mappings. NOTE: You can share a named dynamic C
cache. If two Lookup transformations share a static cache, the Integration Service does not allocate additional memory for shared transformations in the same pipeline stage. For shared transformations in different
Persistent Named Cache can be reused multiple times in multiple sessions
Joshy George
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2 Comments
thomas mcclure | Jul 4, 2009
TYPO3 IS WAMP (WINDOWS APACHE MYSQL PHP It is an open source CMS for testing and displaying MYSQL with PHP. Use illuminate inc to get ad hoc searches and selection on the fly. See my site: www.professionallcfilm.wetpaint.com AlaaEddin AlMabhoh | Jul 31
AlaaEddin on Behalf of University Utara Malaysia We'd like to invite you to complete the data warehouse system success survey in regards to your experiences. We are very interested in hearing from you. The survey should take no longer than 10 minutes to complete. To participate in this survey, simply click here:
Thank you for your valued participation! Sincerely, AlaaEddin PhD Candidate, University Utara Malaysia