| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | AI Rumman <rummandba(at)gmail(dot)com> |
| Cc: | pgsql-general General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: shared_buffer advice |
| Date: | 2010-06-14 08:54:12 |
| Message-ID: | AANLkTin67HA-9fGSs1XhGoq7ZaR7xxetGRK8uqPs1yag@mail.gmail.com |
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| Lists: | pgsql-general |
On Mon, Jun 14, 2010 at 1:36 AM, AI Rumman <rummandba(at)gmail(dot)com> wrote:
> I have a server with Dual-Core 4 cpu and 32 GB RAM.
> This is the database server. Only Postgresql 8.1 is running on it with
> multiple databases.
>
> How should I plan for shared_buffers and effective cache size?
> Any idea please.
Note that effective cache size is way simpler. Add up the size of the
kernel cache and shared_buffers, set it to that if db is the only
thing on the machine. If it shares it then maybe cut it down a bit.
It's not a real sensitive setting to a few gigabytes here or there,
and allocates nothing, just helps the planner decide teh % chance
something is in cache or not.
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