Re: COMMIT takes long time for read only transaction

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Mario Splivalo" <mario(dot)splivalo(at)megafon(dot)hr>, <pgsql-admin(at)postgresql(dot)org>
Subject: Re: COMMIT takes long time for read only transaction
Date: 2011-05-26 19:50:04
Message-ID: 4DDE689C020000250003DDA0@gw.wicourts.gov
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Mario Splivalo <mario(dot)splivalo(at)megafon(dot)hr> wrote:

> 2011-05-26 18:25:51.624 CEST [16163] <ample(at)knjiz>
> [192.168.1.5(32431)]
> COMMIT LOG: duration: 11159.202 ms statement: COMMIT
> 2011-05-26 18:26:05.788 CEST [16163] <ample(at)knjiz>
> [192.168.1.5(32431)]
> COMMIT LOG: duration: 326.856 ms statement: COMMIT
>
> This is a grep from a postgres log when I had logging of all
> statements enabled. I did grep by the local pid (16163), and what
> I don't understand is:
> - why is first COMMIT taking 11 seconds, when there are only
> SELECTs in the transaction? SELECTS don't call any user defined
> functions, just plain reads from the tables.
> - what is that second COMMIT? If I issue COMMIT without 'BEGIN'
> shouldn't I get: "COMMIT WARNING: there is no transaction in
> progress"

Hard to say what's going on without knowing more about your logging
configuration. If you run this query and post the results it will
help clarify the situation:

http://wiki.postgresql.org/wiki/Server_Configuration

-Kevin

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