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Cc: Kevin Grittner <kevin.grittner@wicourts.gov>,
	pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: Identical query slower on 8.4 vs 8.3
From: Alvaro Herrera <alvherre@commandprompt.com>
To: Patrick Donlin <pdonlin@oaisd.org>
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Date: Thu, 15 Jul 2010 11:21:33 -0400
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Excerpts from Patrick Donlin's message of jue jul 15 11:12:53 -0400 2010:
> I'll read over that wiki entry, but for now here is the EXPLAIN ANALYZE output assuming I did it correctly. I have run vacuumdb --full --analyze, it actually runs as a nightly cron job. 

These plans seem identical (though the fact that the leading whitespace
was trimmed means it's untrustworthy -- please in the future send them
as text attachments instead so that your mailer doesn't interfere with
formatting).  The 8.4 plan is even a full second faster, according to
the "total runtime" line.

The slowness could've been caused by caching effects ...