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From: Tom Lane <tgl@sss.pgh.pa.us>
To: robins@pobox.com
Cc: pgsql-performance@postgresql.org
Subject: Re: Fwd: Strangely Variable Query Performance
Date: Tue, 17 Apr 2007 00:44:33 -0400
Message-ID: <14929.1176785073@sss.pgh.pa.us> (raw)
In-Reply-To: <36af4bed0704162043k23e6bde4hf3d9840dc359f010@mail.gmail.com>
References: <57271CC2-BCB1-4ACA-A177-4FF64F1BC33F@brandeis.edu>
	<Pine.GSO.4.64.0704121928440.17955@kittyhawk.tanabi.org>
	<10355.1176422445@sss.pgh.pa.us>
	<Pine.GSO.4.64.0704122001160.17955@kittyhawk.tanabi.org>
	<10503.1176423606@sss.pgh.pa.us>
	<Pine.GSO.4.64.0704122025450.17955@kittyhawk.tanabi.org>
	<12360.1176436194@sss.pgh.pa.us>
	<Pine.GSO.4.64.0704122354430.17955@kittyhawk.tanabi.org>
	<12736.1176439091@sss.pgh.pa.us>
	<36af4bed0704162024t23f7d6bbnf4b8042b82b16935@mail.gmail.com>
	<36af4bed0704162043k23e6bde4hf3d9840dc359f010@mail.gmail.com>

Robins <tharakan@gmail.com> writes:
> If and when you do come up with a solution, please do post some details
> about them here... (i say that coz it seems that for obvious reasons, things
> must have gone off air after tom's last email, and one can understand that).
> But an analysis, or atleast a pointer may be of help to someone (like me)
> reading this list.

Oh, sorry, the subsequent discussion moved over to pgsql-hackers:
http://archives.postgresql.org/pgsql-hackers/2007-04/msg00621.php
and -patches:
http://archives.postgresql.org/pgsql-patches/2007-04/msg00374.php

Those are good places to look if a discussion on -bugs or other lists
seems to tail off...

			regards, tom lane

PS: the reason I couldn't reproduce the behavior was just that the dummy
data I was using didn't have the right statistics.



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