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From: Alvaro Herrera <alvherre@commandprompt.com>
To: Matthew Wakeling <matthew@flymine.org>
Cc: David Jarvis <thangalin@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thom Brown <thombrown@gmail.com>
Cc: pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: Optimize date query for large child tables: GiST or GIN?
Date: Tue, 01 Jun 2010 13:14:06 -0400
Message-ID: <1275412319-sup-2359@alvh.no-ip.org> (raw)
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Excerpts from Matthew Wakeling's message of mar jun 01 05:55:35 -0400 2010:
> On Sun, 23 May 2010, David Jarvis wrote:
> > The measurement table indexes (on date and weather station) were not being
> > used because the only given date ranges (e.g., 1900 - 2009) were causing the
> > planner to do a full table scan, which is correct.
> 
> I wonder if you might see some benefit from CLUSTERing the tables on the 
> index.

Eh, isn't this a GIN or GiST index?  I don't think you can cluster on
those, can you?

-- 
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support



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