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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Steve <cheetah@tanabi.org>
Cc: Scott Marlowe <smarlowe@g2switchworks.com>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Strangely Variable Query Performance
Date: Thu, 12 Apr 2007 19:29:09 -0400
Message-ID: <10067.1176420549@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.GSO.4.64.0704121855300.17955@kittyhawk.tanabi.org>
References: <57271CC2-BCB1-4ACA-A177-4FF64F1BC33F@brandeis.edu>
	<E1HbzJr-0005VG-GC@elasmtp-curtail.atl.sa.earthlink.net>
	<16E9A17C-ADFA-43B2-B7EA-5C7A4D7E96D1@event-s.net>
	<E1Hc0lc-0001iE-La@elasmtp-banded.atl.sa.earthlink.net>
	<0914C05F-BA1B-4A6C-A1B1-52256BC851A4@event-s.net>
	<1176396964.13754.16.camel@state.g2switchworks.com>
	<Pine.LNX.4.64.0704121000570.32187@glacier.frostconsultingllc.com>
	<Pine.GSO.4.64.0704121653030.17955@kittyhawk.tanabi.org>
	<1176414724.13754.23.camel@state.g2switchworks.com>
	<Pine.GSO.4.64.0704121804000.17955@kittyhawk.tanabi.org>
	<1176416077.13754.26.camel@state.g2switchworks.com>
	<9833.1176418809@sss.pgh.pa.us>
	<Pine.GSO.4.64.0704121855300.17955@kittyhawk.tanabi.org>

Steve <cheetah@tanabi.org> writes:
> Here's my planner parameters:

I copied all these, and my 8.2.x still likes the bitmap scan a lot
better than the seqscan.  Furthermore, I double-checked the CVS history
and there definitely haven't been any changes in that area in REL8_2
branch since 8.2.3.  So I'm a bit baffled.  Maybe the misbehavior is
platform-specific ... what are you on exactly?  Is there anything
nonstandard about your Postgres installation?

			regards, tom lane



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