Received: from localhost (maia-2.hub.org [200.46.204.187]) by postgresql.org (Postfix) with ESMTP id C1F379FB561 for ; Mon, 9 Apr 2007 11:49:26 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.187]) (amavisd-maia, port 10024) with ESMTP id 93949-01-3 for ; Mon, 9 Apr 2007 11:49:14 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id DF7989FB50A for ; Mon, 9 Apr 2007 11:49:20 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.6/8.13.6) with ESMTP id l39EnHIM027870; Mon, 9 Apr 2007 10:49:17 -0400 (EDT) To: "s d" cc: pgsql-performance@postgresql.org Subject: Re: Beginner Question In-reply-to: <24b53fa00704090209pcdd2c6cof487d6388c1743b8@mail.gmail.com> References: <24b53fa00704090209pcdd2c6cof487d6388c1743b8@mail.gmail.com> Comments: In-reply-to "s d" message dated "Mon, 09 Apr 2007 02:09:53 -0700" Date: Mon, 09 Apr 2007 10:49:17 -0400 Message-ID: <27869.1176130157@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200704/204 X-Sequence-Number: 24081 "s d" writes: > 1. i can undestand where the cost=11.53 came from but where did the > 1192.09 come form? The values are in milli right ? No, the unit of estimated cost is 1 disk page fetch. See http://www.postgresql.org/docs/8.2/static/using-explain.html regards, tom lane