To: Alvaro Herrera <alvherre@commandprompt.com>
cc: Steven Flatt <steven.flatt@gmail.com>,
	"Steinar H. Gunderson" <sgunderson@bigfoot.com>,
	pgsql-performance@postgresql.org
Subject: Re: performance drop on 8.2.4, reverting to 8.1.4 
In-reply-to: <20070608012257.GB20828@alvh.no-ip.org> 
References: <20070518104646.GA13811@uio.no>
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	<357fa7590706051430h5db6760dx9d4a46c7a8a36205@mail.gmail.com>
	<10645.1181081285@sss.pgh.pa.us>
	<357fa7590706071011g4e337937rc622ffed39856425@mail.gmail.com>
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	<20070608012257.GB20828@alvh.no-ip.org>
Comments: In-reply-to Alvaro Herrera <alvherre@commandprompt.com>
	message dated "Thu, 07 Jun 2007 21:22:57 -0400"
Date: Thu, 07 Jun 2007 21:31:14 -0400
Message-ID: <11710.1181266274@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>

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