Re: multi-column index

From: Manfred Koizar <mkoi-pg(at)aon(dot)at>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: David Brown <time(at)bigpond(dot)net(dot)au>, Josh Berkus <pgsql-performance(at)postgresql(dot)org>
Subject: Re: multi-column index
Date: 2005-03-17 08:51:36
Message-ID: rjgi31hst0r9ok89215vv1ng8boo8ej10u@email.aon.at
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On Wed, 16 Mar 2005 22:19:13 -0500, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>calculate the correlation explicitly for each index

May be it's time to revisit an old proposal that has failed to catch
anybody's attention during the 7.4 beta period:
http://archives.postgresql.org/pgsql-hackers/2003-08/msg00937.php

I'm not sure I'd store index correlation in a separate table today.
You've invented something better for functional index statistics, AFAIR.

Servus
Manfred

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