RE: So how big is your buffer cache ?

Wow, 30 GB plus!?!?!
Well, we don't have any SGAs that currently break the 4GB barrrier.
Our platform is 32-bit Oracle on Solaris.  As we are moving to 9i,
we are going to 64-bit Oracle, and may be judiciously increasing the
SGA sizes.  We are big believers in KEEP, RECYCLE, and DEFAULT buffer
pools which definitely help make the most of the buffer cache.  Our largest
system currently runs on a 6800, configured with 8 CPUs and 12 GB of RAM
in the primary domain.  PGAs account for about 7.5GB, the total SGA is
about 2.5GB, of which the buffer cache is 2GB.  

-Mark


-----Original Message-----
From:   oracle-l-bounce@xxxxxxxxxxxxx on behalf of Richard Foote
Sent:   Sat 8/28/2004 7:56 AM
To:     oracle-l@xxxxxxxxxxxxx
Cc:     
Subject:        So how big is your buffer cache ?
Hi All,

In an interesting insight into how Don Burleson performs tuning at the
c.d.o.s newsgroup
(http://groups.google.com/groups?dq=&hl=en&lr=&ie=UTF-8&th=73f606eef5e7e99f)
. Don suggests he has "no problem throwing hardware at crappy code when the
client doesn't want to tune it". He's also basically recommending using AWE
and utilising all available RAM on 32bit windows, whether you need to or
not. I mean, AWE has no disadvantages right ... :)

However, he also makes the claim that "It's not uncommon to see working sets
of frequently-referenced data of for than 30-gig for a large database. AWE
is a great techniques for 32-bit Windows databases and  I do it for dozens
of databases every year, ALWAYS with great results."

So my question to you all is how large are your largest buffer caches ? How
many of you have a buffer cache that is 30G+ ? And on 32bit windows ?

Love to know !!

Cheers

Richard


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