X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id BB0D8D7F1F for ; Wed, 7 Sep 2005 13:58:01 -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 88073-01 for ; Wed, 7 Sep 2005 16:57:58 +0000 (GMT) Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [129.241.93.19]) by svr1.postgresql.org (Postfix) with ESMTP id 6D6C7D7D27 for ; Wed, 7 Sep 2005 13:57:57 -0300 (ADT) Received: from trofast.ipv6.sesse.net ([2001:700:300:dc03:20e:cff:fe36:a766] helo=trofast.sesse.net) by cassarossa.samfundet.no with esmtp (Exim 4.50) id 1ED3FD-0000LW-6g for pgsql-performance@postgresql.org; Wed, 07 Sep 2005 18:57:55 +0200 Received: from sesse by trofast.sesse.net with local (Exim 3.36 #1 (Debian)) id 1ED3FC-0003Jp-00 for ; Wed, 07 Sep 2005 18:57:54 +0200 Date: Wed, 7 Sep 2005 18:57:54 +0200 From: "Steinar H. Gunderson" To: pgsql-performance@postgresql.org Subject: Re: Query take 101 minutes, help, please Message-ID: <20050907165754.GA12319@uio.no> Mail-Followup-To: pgsql-performance@postgresql.org References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Operating-System: Linux 2.6.11.8 on a i686 X-Message-Flag: Outlook? --> http://www.mozilla.org/products/thunderbird/ User-Agent: Mutt/1.5.10i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.014 required=5 tests=[AWL=0.014] X-Spam-Level: X-Archive-Number: 200509/110 X-Sequence-Number: 14418 On Wed, Sep 07, 2005 at 12:22:27PM -0400, Christian Compagnon wrote: > I'm a newbie in postgresql, I've installed it on a Windows XP machine > ( I can't use linux, it's a company machine ), I'm courious why this > query takes so long It sounds like you've set work_mem too low; increasing it might help. Also try rewriting your query to SELECT "Rut Cliente" FROM "Internet_Abril" WHERE "Rut Cliente" NOT IN ( SELECT "Rut Cliente" FROM "Internet_Enero" ) AND "Rut Cliente" NOT IN ( SELECT "Rut Cliente" FROM "Internet_Febrero" ) AND "Rut Cliente" NOT IN ( SELECT "Rut Cliente" FROM "Internet_Marzo" ) (I'm not sure how optimized UNION inside an IN/NOT IN is.) /* Steinar */ -- Homepage: http://www.sesse.net/