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Re: slow vacuum performance

From: Bill Moran <wmoran(at)potentialtech(dot)com>
To: pginfo <pginfo(at)t1(dot)unisoftbg(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: slow vacuum performance
Date: 2004-03-24 14:07:27
Message-ID: 4061961F.6080009@potentialtech.com (view raw or flat)
Thread:
Lists: pgsql-performance
pginfo wrote:
> Hi,
> 
> I am running pg 7.4.1 on linux box.
> I have a midle size DB with many updates and after it I try to run
> vacuum full analyze.
> It takes about 2 h.
> If I try to dump and reload the DB it take 20 min.
> 
> How can I improve the vacuum full analyze time?

How often are you vacuuming?  If you've gone a LONG time since the last vacuum,
it can take quite a while, to the point where a dump/restore is faster.

A recent realization that I've had some misconceptions about vacuuming led me
to re-read section 8.2 of the admin guide (on vacuuming) ... I highly suggest
a review of these 3 pages of the admin manual, as it contains an excellent
description of why databases need vacuumed, that one can use to determine how
often vacuuming is necessary.

-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com


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Subject: Re: slow vacuum performance
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