Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 51C8E650E99 for ; Thu, 26 Jun 2008 19:20:29 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 52393-01 for ; Thu, 26 Jun 2008 19:20:21 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from westnet.com (westnet.com [216.187.52.2]) by postgresql.org (Postfix) with ESMTP id ABCD8650EFB for ; Thu, 26 Jun 2008 19:20:17 -0300 (ADT) Received: from westnet.com (localhost [127.0.0.1]) by westnet.com (8.14.0/8.14.0) with ESMTP id m5QMKGIU004408; Thu, 26 Jun 2008 18:20:16 -0400 (EDT) Received: from localhost (gsmith@localhost) by westnet.com (8.14.0/8.13.2/Submit) with ESMTP id m5QMKFgE004404; Thu, 26 Jun 2008 18:20:16 -0400 (EDT) X-Authentication-Warning: westnet.com: gsmith owned process doing -bs Date: Thu, 26 Jun 2008 18:20:15 -0400 (EDT) From: Greg Smith X-X-Sender: gsmith@westnet.com To: Craig Ringer cc: pgsql-performance@postgresql.org Subject: Re: ??: Postgresql update op is very very slow In-Reply-To: <486396A9.1030208@postnewspapers.com.au> Message-ID: References: <473587.97248.qm@web32701.mail.mud.yahoo.com> <004b01c8d671$3dec1630$0544000a@hz.ali.com> <486219B6.7050003@enterprisedb.com> <005101c8d773$ff81b2c0$0644000a@hz.ali.com> <48638939.5080500@enterprisedb.com> <486396A9.1030208@postnewspapers.com.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200806/188 X-Sequence-Number: 30538 On Thu, 26 Jun 2008, Craig Ringer wrote: > I'd be interested to have this confirmed, as I don't think I've seen it > documented anywhere. Is it a side-effect/benefit of HOT somehow? The documentation is in README.HOT, for example: http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/heap/README.HOT?rev=1.3;content-type=text%2Fplain -- * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD