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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Steve <cheetah@tanabi.org>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Strangely Variable Query Performance
Date: Thu, 12 Apr 2007 18:01:41 -0400
Message-ID: <9213.1176415301@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.GSO.4.64.0704121735000.17955@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>
	<5772.1176413092@sss.pgh.pa.us>
	<Pine.GSO.4.64.0704121735000.17955@kittyhawk.tanabi.org>

Steve <cheetah@tanabi.org> writes:
> Here's the table and it's indexes.  Before looking, a note; there's 
> several 'revop' indexes, this is for sorting.  The customer insisted on, 
> frankly, meaninglessly complicated sorts.  I don't think any of that 
> matters for our purposes here though :)

Oy vey ... I hope this is a read-mostly table, because having that many
indexes has got to be killing your insert/update performance.

I see that some of the revop indexes might be considered relevant to
this query, so how exactly have you got those opclasses defined?
There's built-in support for reverse sort as of CVS HEAD, but in
existing releases you must have cobbled something together, and I wonder
if that could be a contributing factor ...

			regards, tom lane



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