Re: [GENERAL] Optimizations for busy DB??

> On Thu, 13 May 1999, Brian wrote:
>
> > Would something like this be appropriate?
> >
> > /usr/bin/postmaster -B 256 -i -S -D/var/lib/pgsql -o -F -B 256 -S 1024
> >
> > or should -B just be in their once? in the postmaster setting?
>
> Just once. If you pass it back to a backend from the postmaster, the
> postmaster handles the allocation as shared memory buffers. Here's what
> the man page for postgres says:
>
> -B n_buffers
> If the backend is running under the postmaster,
> n_buffers is the number of shared-memory buffers
> that the postmaster has allocated for the backend
> server processes that it starts. If the backend is
> running standalone, this specifies the number of
> buffers to allocate. This value defaults to 64,
> and each buffer is 8k bytes.

Because the buffers are shared by all postmaster backends, it is a
postmaster option. If you are running standalone, you will have the
postgres backend allocate its own buffers.

--
Bruce Momjian | http://www.op.net/~candle
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