X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 519D89DC80E for ; Fri, 10 Mar 2006 13:09:27 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 06273-05 for ; Fri, 10 Mar 2006 13:09:26 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 0E8C69DC805 for ; Fri, 10 Mar 2006 13:09:24 -0400 (AST) 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 k2AH9JNT006629; Fri, 10 Mar 2006 12:09:19 -0500 (EST) To: Evgeny Gridasov cc: pgsql-performance@postgresql.org Subject: Re: one-field index vs. multi-field index planner estimates In-reply-to: <20060310194545.be002083.eugrid@fpm.kubsu.ru> References: <6BCB9D8A16AC4241919521715F4D8BCEA35109@algol.sollentuna.se> <200603101113.35868.jdevisser@digitalfairway.com> <20060310194545.be002083.eugrid@fpm.kubsu.ru> Comments: In-reply-to Evgeny Gridasov message dated "Fri, 10 Mar 2006 19:45:45 +0300" Date: Fri, 10 Mar 2006 12:09:19 -0500 Message-ID: <6628.1142010559@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.112 required=5 tests=[AWL=0.112] X-Spam-Score: 0.112 X-Spam-Level: X-Archive-Number: 200603/136 X-Sequence-Number: 17573 Evgeny Gridasov writes: > Recently I've discovered an interesting thing (Postgres version 8.1.3): Have you ANALYZEd the table since loading it? What fraction of the rows have visible = true? regards, tom lane