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Re: performance drop on 8.2.4, reverting to 8.1.4

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: Steven Flatt <steven(dot)flatt(at)gmail(dot)com>, "Steinar H(dot) Gunderson" <sgunderson(at)bigfoot(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: performance drop on 8.2.4, reverting to 8.1.4
Date: 2007-06-08 01:31:14
Message-ID: 11710.1181266274@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> Tom Lane escribi:
>> 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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