Data Cache and Generic Cache

Hello,
According to this document,
http://download.oracle.com/docs/cd/B16240_01/doc/apirefs.102/e12639/chapter1.htm#CIAEFHFB
I see there are two cache system in Oracle BI Server, "Data Cache" and "Generic Cache".
What is the difference between these two kinds of cache ?
Thanks.

Hi user611881,
I'll try to explain the two cache types here, but if someone can better phrase it than myself, by all means, step up.
Data Cache:
The OBIEE BI Server will cache the result set of SQL that is executed. These cached results are records and if OBIEE sees another report requesting the same record set that it already has in cache, it will go straight to the cache version instead of re-issuing the SQL
Generic Cache:
The generic cache is the presentation server cache. This has to do with the caching of particular request. If the BI Server detects a cached version of a request, it will get the request directly from the cache and not even go down to check for the cached record set.
This is how they function. Assume you have report A with record set 1 and there's no data in either cache.
You run Report A
1) Presentation Service checks if the Request is in the generic cache.
2) This check fails.
3) Presentation service issues logical SQL query to BI Server
4) BI Server checks if there is any record set matching the logical query in the cache
5) This check fails.
6) BI Server issues the physical SQL
7) BI Server caches the result set
8) Presentation service gets result set and formats the data
9) Presentation service caches presentation results
10) Report A is displayed
That is my understanding of the Data and Generic Caches.
Good luck and if you found this post useful, please award points!
Best regards,
-Joe

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