How much data canbe cache in SGA

Hai everybody,
my company using Oracle 11g 11.2.0.1.0 - Production database, my os is RHEL 5.5 ,my server's physical memory is 30.9 GB ( cat /proc/meminfo ) ie the SGA size [ (30.9*40/100)=12.5 GB ] so i use 12.5GB SGA size for one instance, we need to cache some data for our application performance how much data can cache in SGA based on 12.5 GB or how to calculate how much data can cache in SGA without any performance degradation.
Regards Benk

Aman has it right. WHY?
the keep pool, alter table cache, etc - I would not be doing ANY of these without a good reason.
Often times, people think that forcing a table to stay in the cache is a good idea. It rarely is. If you want things in the cache, use them. If they are used, they will naturally have their blocks cached. If you don't use them, they can get flushed out. But if you don't use them, why do you want them using memory that could better be used by other things?
My advice: don't try to second-guess Oracle's memory management and caching strategy. If you think you have a reason to, post it here and we can help you (or debunk your reason). Based on the fact that you've apparently calculated the SGA using that silly, meaningless "rule" that says give it 40% of your total RAM, I'd guess that you are looking around for a magic bullet, and you don't actually have a problem to solve.
John

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