Message-ID: <4698F0CF.7000602@p-dw.com>
Date: Sat, 14 Jul 2007 17:50:39 +0200
From: Patric de Waha <lists@p-dw.com>
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To: pgsql-performance@postgresql.org
Subject: Vacuum full considered useful ;)
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Hi,
    Something I'd like to share.  

    I switched to postgres about 4 months ago.
   The perfomance after a while got worse.
    I posted a message here, where the result was that my IO was the 
problem.

    I run vacuum every night. I never used vacuum full because it is not
    explicitly recommended and I read somewhere in the archives a mail that
    the consistency of the db suffered after a vacuum full run.
   
    Yesterday I switched from 8.1 to 8.2. So I needed to dump the dbase
    and reimport it. The dbase after 4 months of running without "vacuum 
full"
    reached 60 gigabyte of diskspace. Now after a fresh import it only 
has 5 gigabyte!

    No wonder, I got IO problems with such a fragmentation.

    For people not very familiar with postgres especially those coming 
from mysql,
    i'd recommend paying attention to this.

regards,
    patric de waha