X-Original-To: pgsql-performance@postgresql.org
Received: from spampd.localdomain (postgresql.org [64.49.215.8])
	by postgresql.org (Postfix) with ESMTP id 1AFA1475AE5
	for <pgsql-performance@postgresql.org>;
	Fri,  9 May 2003 08:31:52 -0400 (EDT)
Received: from sss.pgh.pa.us (unknown [192.204.191.242])
	by postgresql.org (Postfix) with ESMTP id 046C0475A80
	for <pgsql-performance@postgresql.org>;
	Fri,  9 May 2003 08:31:51 -0400 (EDT)
Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1])
	by sss.pgh.pa.us (8.12.9/8.12.9) with ESMTP id h49CVkU6029798;
	Fri, 9 May 2003 08:31:46 -0400 (EDT)
To: Achilleus Mantzios <achill@matrix.gatewaynet.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: An unresolved performance problem. 
In-reply-to: <Pine.LNX.4.44.0305091044540.6198-100000@matrix.gatewaynet.com> 
References: <Pine.LNX.4.44.0305091044540.6198-100000@matrix.gatewaynet.com>
Comments: In-reply-to Achilleus Mantzios <achill@matrix.gatewaynet.com>
	message dated "Fri, 09 May 2003 11:00:30 -0200"
Date: Fri, 09 May 2003 08:31:46 -0400
Message-ID: <29797.1052483506@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
X-Spam-Status: No, hits=-32.3 required=5.0
	tests=BAYES_00,EMAIL_ATTRIBUTION,IN_REP_TO,QUOTED_EMAIL_TEXT,
	REFERENCES,REPLY_WITH_QUOTES autolearn=ham	version=2.50
X-Spam-Level: 
X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp)
X-Archive-Number: 200305/111
X-Sequence-Number: 1890

Achilleus Mantzios <achill@matrix.gatewaynet.com> writes:
> If so, how can one find the correlation between the ordering
> of a table and a multicolumn index?

Well, it is surely no better than the correlation of the index's
first column --- what is that?

			regards, tom lane