From: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: pgsql-performance@postgresql.org
Subject: Re: Performance problem on 8.2.4, but not 8.2.3
Date: Fri, 25 May 2007 22:05:23 +0200
Message-ID: <20070525200523.GA15547@uio.no> (raw)
In-Reply-To: <21071.1180122995@sss.pgh.pa.us>
References: <2C91A79B-6AFD-4734-B245-2ED81F4F15D4@mediamatters.org>
<21071.1180122995@sss.pgh.pa.us>
On Fri, May 25, 2007 at 03:56:35PM -0400, Tom Lane wrote:
> I looked through the CVS logs and didn't find any planner changes
> between 8.2.3 and 8.2.4 that seem likely to affect your query, so
> I'm thinking it must be a statistical discrepancy.
It looks like the estimated cost is lower for 8.2.4 -- could it be that the
fact that he's giving it more memory lead to the planner picking a plan that
happens to be worse?
/* Steinar */
--
Homepage: http://www.sesse.net/
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To: pgsql-performance@postgresql.org
Cc: sgunderson@bigfoot.com
Subject: Re: Performance problem on 8.2.4, but not 8.2.3
In-Reply-To: <20070525200523.GA15547@uio.no>
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