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 0D2CC52836 for ; Mon, 23 May 2005 15:04:02 -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 59916-06 for ; Mon, 23 May 2005 18:03:55 +0000 (GMT) Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [129.241.93.19]) by svr1.postgresql.org (Postfix) with ESMTP id 5F43E52879 for ; Mon, 23 May 2005 15:03:54 -0300 (ADT) Received: from trofast.sesse.net ([129.241.93.32]) by cassarossa.samfundet.no with esmtp (Exim 4.34) id 1DaHHM-0003RO-Ip for pgsql-performance@postgresql.org; Mon, 23 May 2005 20:03:53 +0200 Received: from sesse by trofast.sesse.net with local (Exim 3.36 #1 (Debian)) id 1DaHHM-0006Cm-00 for ; Mon, 23 May 2005 20:03:52 +0200 Date: Mon, 23 May 2005 20:03:52 +0200 From: "Steinar H. Gunderson" To: pgsql-performance@postgresql.org Subject: Re: Fwd: Index on table when using DESC clause Message-ID: <20050523180352.GA23486@uio.no> Mail-Followup-To: pgsql-performance@postgresql.org References: <6d31bed04ab35cbbe2df37af979d9882@implements.be> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <6d31bed04ab35cbbe2df37af979d9882@implements.be> X-Operating-System: Linux 2.6.11.8 on a i686 X-Message-Flag: Outlook? --> http://www.mozilla.org/products/thunderbird/ User-Agent: Mutt/1.5.9i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.014 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200505/343 X-Sequence-Number: 12507 On Mon, May 23, 2005 at 07:41:19PM +0200, Yves Vindevogel wrote: > However, when I query my db using for instance order by pages, > documentname, it is very fast. > If I use order by pages desc, documentname, it is not fast at > all, like it is not using the index properly at all. Make an index on "pages desc, documentname asc". /* Steinar */ -- Homepage: http://www.sesse.net/