Received: from localhost (unknown [200.46.204.182])
	by postgresql.org (Postfix) with ESMTP id 9B0239F9AFD
	for <pgsql-performance-postgresql.org@postgresql.org>;
	Sun,  2 Sep 2007 12:49:35 -0300 (ADT)
Received: from postgresql.org ([200.46.204.71])
	by localhost (mx1.hub.org [200.46.204.182]) (amavisd-maia, port 10024)
	with ESMTP id 09489-08 for
	<pgsql-performance-postgresql.org@postgresql.org>;
	Sun,  2 Sep 2007 12:49:32 -0300 (ADT)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.5
Received: from gwmta.wicourts.gov (gwmta.wicourts.gov [165.219.244.99])
	by postgresql.org (Postfix) with ESMTP id A5AAC9F9AFA
	for <pgsql-performance@postgresql.org>;
	Sun,  2 Sep 2007 12:49:32 -0300 (ADT)
Received: from Courts-MTA by gwmta.wicourts.gov
	with Novell_GroupWise; Sun, 02 Sep 2007 10:49:31 -0500
Message-Id: <46DA9522.EE98.0025.0@wicourts.gov>
X-Mailer: Novell GroupWise Internet Agent 7.0.2 
Date: Sun, 02 Sep 2007 10:49:09 -0500
From: "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
To: "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>,
	"Shawn" <postgres@xmtservices.net>
Subject: Re: Slow Query
References: <20070901102947.0c0a50a3@boffin.xmtservices.net>
In-Reply-To: <20070901102947.0c0a50a3@boffin.xmtservices.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
X-Virus-Scanned: Maia Mailguard 1.0.1
X-Archive-Number: 200709/10
X-Sequence-Number: 26555

>>> On Sat, Sep 1, 2007 at 12:29 PM, in message
<20070901102947.0c0a50a3@boffin.xmtservices.net>, Shawn
<postgres@xmtservices.net> wrote:=20
> update shawns_data set alias =3D null;
> Even after VACUUM this simple line takes 35 sec to complete.
=20
Would any rows already have a null alias when you run this?
=20
If so, try adding 'where alias is not null' to the query.
=20
-Kevin
=20