Received: from localhost (unknown [200.46.204.184])
	by developer.postgresql.org (Postfix) with ESMTP id 8B31F2E003C
	for <pgsql-performance-postgresql.org@developer.postgresql.org>;
	Tue,  6 May 2008 11:22:23 -0300 (ADT)
Received: from developer.postgresql.org ([200.46.204.71])
	by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024)
	with ESMTP id 76877-04
	for <pgsql-performance-postgresql.org@developer.postgresql.org>;
	Tue,  6 May 2008 11:22:05 -0300 (ADT)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.5
Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130])
	by developer.postgresql.org (Postfix) with ESMTP id 958B42E0039
	for <pgsql-performance@postgresql.org>;
	Tue,  6 May 2008 11:22:13 -0300 (ADT)
Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1])
	by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m46EM7tE013632;
	Tue, 6 May 2008 10:22:07 -0400 (EDT)
To: Vlad Arkhipov <arhipov@dc.baikal.ru>
cc: pgsql-performance@postgresql.org
Subject: Re: Seqscan problem 
In-reply-to: <48203D7B.2000809@dc.baikal.ru> 
References: <48203D7B.2000809@dc.baikal.ru>
Comments: In-reply-to Vlad Arkhipov <arhipov@dc.baikal.ru>
	message dated "Tue, 06 May 2008 20:14:03 +0900"
Date: Tue, 06 May 2008 10:22:07 -0400
Message-ID: <13631.1210083727@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
X-Virus-Scanned: Maia Mailguard 1.0.1
X-Archive-Number: 200805/79
X-Sequence-Number: 30047

Vlad Arkhipov <arhipov@dc.baikal.ru> writes:
> I've just discovered a problem with quite simple query. It's really 
> confusing me.
> Postgresql 8.3.1, random_page_cost=1.1. All tables were analyzed before 
> query.

What have you got effective_cache_size set to?

			regards, tom lane