Re: Needed: Simplified guide to optimal memory configuration

From: Bruno Wolff III <bruno(at)wolff(dot)to>
To: Todd Landfried <tlandfried(at)viatornetworks(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Needed: Simplified guide to optimal memory configuration
Date: 2005-06-15 14:19:49
Message-ID: 20050615141949.GB7595@wolff.to
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On Wed, Jun 15, 2005 at 02:06:27 -0700,
Todd Landfried <tlandfried(at)viatornetworks(dot)com> wrote:
>
> What's the problem? The sucker gets s-l-o-w on relatively simple
> queries. For example, simply listing all of the users online at one
> time takes 30-45 seconds if we're talking about 800 users. We've
> adjusted the time period for vacuuming the tables to the point where
> it occurs once an hour, but we're getting only a 25% performance gain
> from that. We're looking at the system settings now to see how those
> can be tweaked.

It might be useful to see example slow queries and the corresponding
explain analyze output.

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