Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id A77C29F93F2 for ; Wed, 10 Oct 2007 09:11:01 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 03891-01-4 for ; Wed, 10 Oct 2007 09:10:55 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from sd-2317.dedibox.fr (sd-2317.dedibox.fr [88.191.17.192]) by postgresql.org (Postfix) with ESMTP id 679F59F983F for ; Wed, 10 Oct 2007 09:10:55 -0300 (ADT) Received: from sd-2317.dedibox.fr (localhost.localdomain [127.0.0.1]) by sd-2317.dedibox.fr (Postfix) with ESMTP id 4B4C0C4B1; Wed, 10 Oct 2007 14:10:50 +0200 (CEST) Received: from [192.168.10.1] (ASte-Genev-Bois-153-1-31-41.w83-112.abo.wanadoo.fr [83.112.77.41]) by sd-2317.dedibox.fr (Postfix) with ESMTP id 0C6D635B5; Wed, 10 Oct 2007 14:10:49 +0200 (CEST) Message-ID: <470CC1E7.1070202@lelarge.info> Date: Wed, 10 Oct 2007 14:13:27 +0200 From: Guillaume Lelarge User-Agent: Thunderbird 2.0.0.6 (X11/20071008) MIME-Version: 1.0 To: James Shaw CC: pgsql-docs@postgresql.org Subject: Re: Possible mistake in 'Using EXPLAIN' section References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Virus-Scanned: ClamAV using ClamSMTP X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200710/30 X-Sequence-Number: 4451 James Shaw a écrit : > The example given has "Seq Scan on tenk1 (cost=0.00..458.00" in the > example, but then says, "you will find out that |tenk1| has 358 disk > pages" and "the cost is estimated at 358 page reads". Shouldn't this be > 458 disk page reads? > > I couldn't see this already discussed on this list. Is there a URL that > has the latest docs compiled from CVS? > http://momjian.us/main/writings/pgsql/sgml/ (built every five minutes) Regards. -- Guillaume. http://www.postgresqlfr.org http://dalibo.com