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Re: Vacuum goes worse

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Stéphane Schildknecht <stephane(dot)schildknecht(at)postgresqlfr(dot)org>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Vacuum goes worse
Date: 2007-10-16 14:26:08
Message-ID: 15640.1192544768@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
=?ISO-8859-1?Q?St=E9phane_Schildknecht?= <stephane(dot)schildknecht(at)postgresqlfr(dot)org> writes:
> For some times, we have a vacuuming process on a specific table that
> goes slower and slower. In fact, it took some 3 minutes a month ago, and
> now it take almost 20 minutes. But, if one day it take so many time, it
> is possible that on the day after it will only take 4 minutes...

> I know the table in concern had 450000 tuples two months ago and now has
> more than 700000 tuples in it.

The real question is how often do rows get updated?  I suspect you
probably need to vacuum this table more than once a day.

			regards, tom lane

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