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Cc: Tom Lane <tgl@sss.pgh.pa.us>, pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: blocking automatic vacuum
From: Alvaro Herrera <alvherre@commandprompt.com>
To: Uwe Bartels <uwe.bartels@gmail.com>
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Excerpts from Uwe Bartels's message of jue jul 01 04:42:42 -0400 2010:
> Hi Tom,
> 
> till now i found more blocking vacuum processes in other databases as well.
> we migrated postgres from 8.3 to 8.4 in april.

Please examine pg_locks to see what's blocking autovacuum.  The key is
WHERE granted=f.