X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id DE9E852824 for ; Mon, 13 Jun 2005 13:05:30 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 57049-07 for ; Mon, 13 Jun 2005 16:05:24 +0000 (GMT) Received: from mail.metronet.co.uk (mail.metronet.co.uk [213.162.97.75]) by svr1.postgresql.org (Postfix) with ESMTP id BCB3B52809 for ; Mon, 13 Jun 2005 13:05:23 -0300 (ADT) Received: from mainbox.archonet.com (84-51-143-99.archon037.adsl.metronet.co.uk [84.51.143.99]) by smtp.metronet.co.uk (MetroNet Mail) with ESMTP id A29FF40E079; Mon, 13 Jun 2005 17:05:10 +0100 (BST) Received: from localhost (localhost.localdomain [127.0.0.1]) by mainbox.archonet.com (Postfix) with ESMTP id DB81715ED7; Mon, 13 Jun 2005 17:02:26 +0100 (BST) Received: from mainbox.archonet.com ([127.0.0.1]) by localhost (mainbox [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 01349-10; Mon, 13 Jun 2005 17:02:24 +0100 (BST) Received: from [192.168.1.17] (client17.office.archonet.com [192.168.1.17]) by mainbox.archonet.com (Postfix) with ESMTP id 5860C15ED5; Mon, 13 Jun 2005 17:02:24 +0100 (BST) Message-ID: <42ADAE10.6050204@archonet.com> Date: Mon, 13 Jun 2005 17:02:24 +0100 From: Richard Huxton User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Yves Vindevogel Cc: pgsql-performance@postgresql.org Subject: Re: Fwd: Updates on large tables are extremely slow References: <6243ad910c02150d526b7b32d4cfef9d@implements.be> In-Reply-To: <6243ad910c02150d526b7b32d4cfef9d@implements.be> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.054 tagged_above=0 required=5 tests=AWL, FORGED_RCVD_HELO X-Spam-Level: X-Archive-Number: 200506/299 X-Sequence-Number: 12936 Yves Vindevogel wrote: > I forgot cc > > Begin forwarded message: > >> From: Yves Vindevogel >> Date: Mon 13 Jun 2005 17:45:19 CEST >> To: Tom Lane >> Subject: Re: [PERFORM] Updates on large tables are extremely slow >> >> Yes, but if I update one column, why should PG update 21 indexes ? >> There's only one index affected ! No - all 21 are affected. MVCC creates a new row on disk. -- Richard Huxton Archonet Ltd