Message-ID: <4CBF515B.1060704@vmsinfo.com>
Date: Wed, 20 Oct 2010 16:30:19 -0400
From: Mladen Gogala <mladen.gogala@vmsinfo.com>
Organization: VMS
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To: Dimi Paun <dimi@lattica.com>
CC: "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: What is postmaster doing?
References: <1287600255.18151.58.camel@dimi.lattica.com>
In-Reply-To: <1287600255.18151.58.camel@dimi.lattica.com>
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Dimi Paun wrote:
> Folks,
>
> I am running into a problem with the postmaster: from time to time, it
> runs for a long time. E.g., from top:
>
> 23425 postgres  20   0 22008  10m  10m R 99.9  0.5  21:45.87 postmaster
>
> I'd like to figure out what it is doing. How can I figure out what
> statement causes the problem? 
>
> is there a way I can log all SQL statements to a file, together with the
> time it took to execute them?
>
>   
You can do one better: you can even explain the statements, based on the 
execution time. There is a module called auto explain:

http://www.postgresql.org/docs/8.4/static/auto-explain.html

For the log files, you can parse them using pgfouine and quickly find 
out the most expensive SQL statements.


-- 
 
Mladen Gogala 
Sr. Oracle DBA
1500 Broadway
New York, NY 10036
(212) 329-5251
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