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Question: Where is the cache stored in informatica? Answer: 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.
So Informatica will have Deptno from Table B in Index Cache and Deptname. from Table B in Data Cache. Because your condition is only on Deptno. 2)so every record from table A should be compared with Index cache value of. table B to get the deptname from data cache.