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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Steven Flatt <steven.flatt@gmail.com>
Cc: Steinar H. Gunderson <sgunderson@bigfoot.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: performance drop on 8.2.4, reverting to 8.1.4
Date: Thu, 07 Jun 2007 21:31:14 -0400
Message-ID: <11710.1181266274@sss.pgh.pa.us> (raw)
In-Reply-To: <20070608012257.GB20828@alvh.no-ip.org>
References: <20070518104646.GA13811@uio.no>
	<008201c7993c$76c88a10$653e10ac@ilgvaio>
	<20070518111455.GA13978@uio.no>
	<28604.1179503689@sss.pgh.pa.us>
	<357fa7590706051430h5db6760dx9d4a46c7a8a36205@mail.gmail.com>
	<10645.1181081285@sss.pgh.pa.us>
	<357fa7590706071011g4e337937rc622ffed39856425@mail.gmail.com>
	<11349.1181265079@sss.pgh.pa.us>
	<20070608012257.GB20828@alvh.no-ip.org>

Alvaro Herrera <alvherre@commandprompt.com> writes:
> Tom Lane escribió:
>> I was hoping that the auto plan invalidation code in CVS HEAD would get
>> it out of this problem, but it seems not to for the problem-as-given.
>> The trouble is that it won't change plans until autovacuum analyzes the
>> tables, and that won't happen until the transaction commits and sends
>> off its I-inserted-lotsa-rows report to the stats collector.

> I think there is something we can do about this -- drop the default
> value for analyze threshold.

Maybe worth doing, but it doesn't help for Steve's example.

			regards, tom lane



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