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 E42E15287E for ; Tue, 24 May 2005 20:33:54 -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 12720-09 for ; Tue, 24 May 2005 23:33:46 +0000 (GMT) Received: from davinci.ethosmedia.com (server227.ethosmedia.com [209.128.84.227]) by svr1.postgresql.org (Postfix) with ESMTP id F216B5286C for ; Tue, 24 May 2005 20:33:45 -0300 (ADT) X-EthosMedia-Virus-Scanned: no infections found Received: from [64.81.245.111] (account josh@agliodbs.com HELO temoku.sf.agliodbs.com) by davinci.ethosmedia.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 7402737; Tue, 24 May 2005 16:35:50 -0700 From: Josh Berkus Reply-To: josh@agliodbs.com Organization: Aglio Database Solutions To: mark durrant Subject: Re: Select performance vs. mssql Date: Tue, 24 May 2005 16:35:14 -0700 User-Agent: KMail/1.8 Cc: Bruno Wolff III , pgsql-performance@postgresql.org References: <20050524191328.58243.qmail@web53110.mail.yahoo.com> In-Reply-To: <20050524191328.58243.qmail@web53110.mail.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200505241635.14558.josh@agliodbs.com> X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.046 tagged_above=0 required=5 tests=AWL, FORGED_RCVD_HELO X-Spam-Level: X-Archive-Number: 200505/372 X-Sequence-Number: 12536 Folks, > > This gets brought up a lot. The problem is that the > > index doesn't include > > information about whether the current transaction > > can see the referenced > > row. Putting this information in the index will add > > significant overhead > > to every update and the opinion of the developers is > > that this would be > > a net loss overall. Pretty much. There has been discussion about allowing index-only access to "frozen" tables, i.e. archive partitions. But it all sort of hinges on someone implementing it and testing .... -- --Josh Josh Berkus Aglio Database Solutions San Francisco