From: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: pgsql-performance@postgresql.org
Subject: Re: performance drop on 8.2.4, reverting to 8.1.4
Date: Fri, 18 May 2007 15:10:47 +0200
Message-ID: <20070518131047.GA14326@uio.no> (raw)
In-Reply-To: <008901c79942$e7136e10$653e10ac@ilgvaio>
References: <20070518111455.GA13978@uio.no>
<008901c79942$e7136e10$653e10ac@ilgvaio>
On Fri, May 18, 2007 at 02:51:42PM +0300, Liviu Ionescu wrote:
> it helped, the new version of the query takes 2303 ms on both 8.1.4 and 8.2.4.
And the old one?
> any idea why the 8.2.4 planner is not happy with the initial select? was it
> just a big chance that it worked in 8.1.4 or the 8.2.4 planner has a
> problem?
I guess it was more or less by chance, especially as 8.1 did not reorder
outer joins. Others might know more about the estimation, though.
/* Steinar */
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Homepage: http://www.sesse.net/
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To: pgsql-performance@postgresql.org
Cc: sgunderson@bigfoot.com
Subject: Re: performance drop on 8.2.4, reverting to 8.1.4
In-Reply-To: <20070518131047.GA14326@uio.no>
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