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Date: Mon, 24 Sep 2012 05:23:13 -0700 (PDT)
From: MirrorX <mirrorx@gmail.com>
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Subject: Re: Postgres becoming slow, only full vacuum fixes it
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i remember having a server with 8.4.4 where we had multiple problems with
autovacuum.
if i am not mistaken there are some bugs related with vacuum until 8.4.7. 
i would suggest you to upgrade to the latest 8.4.x version

BR,



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