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 6D8E45287F for ; Tue, 5 Jul 2005 13:10:00 -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 31547-02 for ; Tue, 5 Jul 2005 16:09:58 +0000 (GMT) Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by svr1.postgresql.org (Postfix) with ESMTP id 8314152814 for ; Tue, 5 Jul 2005 13:09:57 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.1/8.13.1) with ESMTP id j65G9uL8023493; Tue, 5 Jul 2005 12:09:56 -0400 (EDT) To: David Gagnon Cc: pgsql-performance@postgresql.org Subject: Re: Why the planner is not using the INDEX . In-reply-to: <42C994BD.3000909@siunik.com> References: <20050630222451.GA17628@calvin.surfutopia.net> <42C473BA.9090305@commandprompt.com> <20050630235821.GA2163@calvin.surfutopia.net> <42C994BD.3000909@siunik.com> Comments: In-reply-to David Gagnon message dated "Mon, 04 Jul 2005 15:57:49 -0400" Date: Tue, 05 Jul 2005 12:09:56 -0400 Message-ID: <23492.1120579796@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.109 tagged_above=0 required=5 tests=AWL, UPPERCASE_25_50 X-Spam-Level: X-Archive-Number: 200507/38 X-Sequence-Number: 13279 David Gagnon writes: > explain analyse SELECT IRNUM FROM IR > INNER JOIN IT ON IT.ITIRNUM = ANY ('{1000, 2000}') AND > IT.ITYPNUM = 'M' AND IR.IRYPNUM = IT.ITYPNUM AND IR.IRNUM = IT.ITIRNUM > WHERE IRNUM = ANY ('{1000, 2000}') and IRYPNUM = 'M' Those =ANY constructs are not currently optimizable at all. You might get better results with "IT.ITIRNUM IN (1000, 2000)" etc. regards, tom lane