Received: from localhost (maia-1.hub.org [200.46.204.191])
	by postgresql.org (Postfix) with ESMTP id A91C19FB62C
	for <pgsql-performance-postgresql.org@postgresql.org>;
	Tue, 15 May 2007 11:05:35 -0300 (ADT)
Received: from postgresql.org ([200.46.204.71])
	by localhost (mx1.hub.org [200.46.204.191]) (amavisd-maia, port 10024)
	with ESMTP id 22042-08 for
	<pgsql-performance-postgresql.org@postgresql.org>;
	Tue, 15 May 2007 11:05:26 -0300 (ADT)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.5
Received: from lists.commandprompt.com (host-254.commandprompt.net
	[207.173.203.254])
	by postgresql.org (Postfix) with ESMTP id E74C19FB5B0
	for <pgsql-performance@postgresql.org>;
	Tue, 15 May 2007 11:05:26 -0300 (ADT)
Received: from perhan.alvh.no-ip.org (201-221-217-243.bk12-dsl.surnet.cl
	[201.221.217.243]) (authenticated bits=0)
	by lists.commandprompt.com (8.13.7/8.13.6) with ESMTP id l4FE58V7011328;
	Tue, 15 May 2007 07:05:08 -0700
Received: by perhan.alvh.no-ip.org (Postfix, from userid 1000)
	id 060A032A13; Tue, 15 May 2007 10:05:06 -0400 (CLT)
Date: Tue, 15 May 2007 10:05:06 -0400
From: Alvaro Herrera <alvherre@commandprompt.com>
To: Drew Wilson <drewmwilson@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Many to many join seems slow?
Message-ID: <20070515140505.GF6298@alvh.no-ip.org>
References: <49735678-25F5-48AA-B464-0864BAE56B55@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <49735678-25F5-48AA-B464-0864BAE56B55@gmail.com>
User-Agent: Mutt/1.5.13 (2006-08-11)
X-Virus-Scanned: ClamAV version 0.88.5,
	clamav-milter version 0.88.5 on projects.commandprompt.com
X-Virus-Status: Clean
X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by
	milter-greylist-1.6 (lists.commandprompt.com [192.168.2.159]);
	Tue, 15 May 2007 07:05:09 -0700 (PDT)
X-Virus-Scanned: Maia Mailguard 1.0.1
X-Archive-Number: 200705/265
X-Sequence-Number: 24655

Drew Wilson escribió:

> =# explain SELECT s.source_id, s.value AS sourceValue, t.value AS  
> translationValue
>       FROM
>           source s,
>           translation_pair tp,
>           translation t,
>           language l
>       WHERE
>           s.source_id = tp.source_id
>           AND tp.translation_id = t.translation_id
>           AND t.language_id = l.language_id
>           AND l.name = 'French' ;

Please provide an EXPLAIN ANALYZE of the query.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.