Recommended size for SGA.

Hi All,
I need to know what will be the recommended size for the SGA.
how to calculate the MAX size for sga?
its an interview question.
Please help?

SGA is composed of buffer_cache, shared_pool, java_pool, large_pool etc. How much memory they need depends on the number of users, the number of different sql statements, the size of the plsql packages, the size of the database, the type of query etc.
You size SGA to get the best performance you can on the server based on what you need to run. There is no rule or formula, just make it as big as possible to give the best performance without causing the server to use paging.
The Max size will depend on how much memory is on the server, the OS you are running, and whether you are using 32 or 64 bit Oracle.
Message was edited by:
rgeier

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***MOVED TO NEW THREAD***
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Message was edited by: martinjamesroberts1

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1.-
2.c
3.a
4.a
5.c
6.b
7.a
8.d
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Kalebd wrote:
All,
What size is recommended for a Windows XP Boot Camp Partition? 100Gb? 50Gb?
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I have my dev server - I leave this on 512MB and that's fine for
most of the stuff I do. We generally up this to a gig on our live
servers (which only run 3-4 small sites), and historically we've not
gone above this on our Shared servers (which host anywhere up to 400
sites) because of the 32-bit limit.
However, now we're running CF9 on 64-bit Server 2008, we've obviously got a lot more RAM available. The obvious choice is to ramp it up high, but I've also been heard that causes issues of its own - the Java GC then has far more work to do when it's called and as the memory fills it's harder to get a contiguous block of RAM, so performance can suffer.
Leave the memory setting at the default value, until testing requires you to do otherwise, or your sites unravel some unforeseen memory demand. It's a risk our SysAdmin colleagues are prepared to take. With the coming of 64-bit, they've been on the alert, and have always cattle-prodded us whenever we've been tempted to push the button to go higher.
Our defaults almost coincide with yours: 512 MB for 32-bit and just over 1GB for 64-bit. So what you yourself have just said is my own basic wisdom on the subject, too: if it aint broke, don't try to fix it.
[postscript: I work full-time at one company, part-time at another. By pure coincidence, both use the same JVM memory settings.]

Recommended size for SGA.

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