From: Ted.Fisher@dana.com
Date: Wed Sep 11 2002 - 13:28:23 EDT
Oracle DB has it's own memory buffers so buffer cache is usually not very
helpful where Oracle DB is the only thing running. I once heard that over
400 MB for buffer cache tends to have a diminishing return. I don't know
if that's still the case - I know in some cases (like NFS servers) more
buffer cache helps. We tend to size it to a percentage that results in
about 300 to 400 MB for buffer cache (we do very little NFS serving here),
so I would be inclined to make it 2 or 3 %. I also heard that it manages
it somewhat more efficiently if it's not variable so it's best to keep
dbc_min_pct and dbc_max_pct the same. All of ours are set the same for
this reason - then it just allocates that on startup and never changes.
Hope this helps.
Ted F. Fisher
Dana Corporation
Global Information Technology Group
Technical Team
Ted.Fisher@dana.com
"Scalone, Galen"
<Galen.Scalone@vacati To: "'hpux-admin@dutchworks.nl'" <hpux-admin@dutchworks.nl>
onclub.com> cc:
Sent by: Subject: [HPADM] RE: Buffer cache
hpux-admin-owner@Dutc
hWorks.nl
09/11/2002 12:43 PM
Sorry the Sym is 8530.
> List,
> V2500 16gb 16 procs. dbc_min_cache set at 2, and dbc_mak_pct set at 3.
> Is this any good, I suggested 5, and 15, and was shot down. Machine is
> running Oracle, on a Symmetrix 8340.
>
> I will summarize.
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