Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 02F9A64FC2D for ; Fri, 26 Sep 2008 10:16:13 -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 07036-04 for ; Fri, 26 Sep 2008 10:16:07 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from lists.commandprompt.com (host-159.commandprompt.net [207.173.203.159]) by postgresql.org (Postfix) with ESMTP id E735364FC31 for ; Fri, 26 Sep 2008 10:16:05 -0300 (ADT) Received: from commandprompt.com (76-10-166-247.dsl.teksavvy.com [76.10.166.247]) (authenticated bits=0) by lists.commandprompt.com (8.13.8/8.13.8) with ESMTP id m8QDJa8s027513 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 26 Sep 2008 06:19:39 -0700 Date: Fri, 26 Sep 2008 09:15:57 -0400 From: Andrew Sullivan To: pgsql-performance@postgresql.org Subject: Re: Slow updates, poor IO Message-ID: <20080926131556.GA1005@commandprompt.com> Mail-Followup-To: Andrew Sullivan , pgsql-performance@postgresql.org References: <48DBE587.3050406@mib-infotech.co.nz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <48DBE587.3050406@mib-infotech.co.nz> User-Agent: Mutt/1.5.17 (2007-11-01) X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0 (lists.commandprompt.com [207.173.203.159]); Fri, 26 Sep 2008 06:19:40 -0700 (PDT) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/234 X-Sequence-Number: 31547 Hi, On Fri, Sep 26, 2008 at 07:24:55AM +1200, John Huttley wrote: > I've just had an interesting encounter with the slow full table update > problem that is inherent with MVCC Quite apart from the other excellent observations in this thread, what makes you think this is an MVCC issue exactly? A -- Andrew Sullivan ajs@commandprompt.com +1 503 667 4564 x104 http://www.commandprompt.com/