Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 2FEE32E0297 for ; Thu, 6 Mar 2008 09:18:22 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 18183-08 for ; Thu, 6 Mar 2008 09:18:19 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from westnet.com (westnet.com [216.187.52.2]) by postgresql.org (Postfix) with ESMTP id 897AC2E0184 for ; Thu, 6 Mar 2008 09:18:19 -0400 (AST) Received: from westnet.com (localhost [127.0.0.1]) by westnet.com (8.14.0/8.14.0) with ESMTP id m26DIHvx016474; Thu, 6 Mar 2008 08:18:17 -0500 (EST) Received: from localhost (gsmith@localhost) by westnet.com (8.14.0/8.13.2/Submit) with ESMTP id m26DIHCO016470; Thu, 6 Mar 2008 08:18:17 -0500 (EST) X-Authentication-Warning: westnet.com: gsmith owned process doing -bs Date: Thu, 6 Mar 2008 08:18:17 -0500 (EST) From: Greg Smith X-X-Sender: gsmith@westnet.com To: sathiya psql cc: pgsql-performance@postgresql.org Subject: Re: count * performance issue In-Reply-To: Message-ID: References: <20080306060829.GA21084@a-kretschmer.de> <47CF8EA6.8070503@mark.mielke.cc> <20080306063643.GB21084@a-kretschmer.de> <3E9C3A51-C28E-4B75-9739-E344DAC72880@fastcrypt.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200803/118 X-Sequence-Number: 29072 On Thu, 6 Mar 2008, sathiya psql wrote: > is there any article saying the difference between this 7.3 and 8.4 I've collected a list of everything on this topic I've seen at http://www.postgresqldocs.org/index.php/Version_8.3_Changes The Feature Matrix linked to there will be a quicker way to see what's happened than sorting through the release notes. None of these changes change the fact that getting an exact count in this situation takes either a sequential scan or triggers. -- * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD