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Message-ID: <44F85B3B.6080106@logix-tt.com>
Date: Fri, 01 Sep 2006 18:09:31 +0200
From: Markus Schaber <schabi@logix-tt.com>
Organization: Logical Tracking and Tracing International AG, Switzerland
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To: pgsql-performance@postgresql.org
Cc: Matteo Sgalaberni <sgala@sgala.com>
Subject: Re: database bloat,non removovable rows, slow query etc...
References: <20060901123915.GT2266@sgala.com> <4027.1157121810@sss.pgh.pa.us>
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Hi, Tom and Matteo,

Tom Lane wrote:
> Matteo Sgalaberni <sgala@sgala.com> writes:
>> 22 daemons that have a persistent connection to this database(all
>> connection are in "idle"(no transaction opened).
> 
> You may think that, but you are wrong.
> 
>> INFO:  "cliente": found 0 removable, 29931 nonremovable row versions in 559 pages
>> DETAIL:  29398 dead row versions cannot be removed yet.
> 
> The only way the above can happen is if there are some fairly old open
> transactions.  Looking in pg_stat_activity might help you identify the
> culprit(s).

Another possibility might be an outstanding two-phase-commit transaction.

HTH,
Markus
-- 
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf.     | Software Development GIS

Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org