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From: Steve <cheetah@tanabi.org>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Scott Marlowe <smarlowe@g2switchworks.com>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Strangely Variable Query Performance
Date: Thu, 12 Apr 2007 19:28:02 -0400 (EDT)
Message-ID: <Pine.GSO.4.64.0704121925280.17955@kittyhawk.tanabi.org> (raw)
In-Reply-To: <10067.1176420549@sss.pgh.pa.us>
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>
	<10067.1176420549@sss.pgh.pa.us>

It's a redhat enterprise machine running AMD x64 processors.

Linux ers3.dddcorp.com 2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16 17:13:42 EST 
2007 x86_64 x86_64 x86_64 GNU/Linux

It was compiled by me, straight up, nothing weird at all, no odd compiler 
options or wahtever :)

So yeah :/ I'm quite baffled as well,

Talk to you later,

Steve


On Thu, 12 Apr 2007, Tom Lane wrote:

> 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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