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Re: Zombie processes

From: Richard Huxton <dev(at)archonet(dot)com>
To: "Peterson, Bjorn" <Bjorn(dot)Peterson(at)pearson(dot)com>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Zombie processes
Date: 2005-03-30 07:30:57
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general
Peterson, Bjorn wrote:
> I am running Postgres 8.0.1 on a Windows 2000 server as a service, and the
> query returns appropriate values after about 30 seconds when executed from a
> psql console.  However, when running this query from a Java application on
> the same machine through the postgres JDBC driver, the Java app hangs on
> st.executeQuery().  The query shows up in pg_stat_activity for about 3
> minutes then goes away, but the process referenced by the pg_stat_activity
> remains active and consumes 50% of the CPU resources indefinitely until I
> kill it off.  I let it run for over an hour yesterday.  I can reproduce this
> every time I run this query.

Two things you should start with:
1. Turn query-logging on in your postgresql.conf so we can see exactly 
what is happening
2. See if you can simulate this using PREPARE/EXECUTE for the query.

I'm guessing that the Java side of things is producing a prepared query 
and substituting parameters in. That might produce a different plan.

First thing is to turn query logging on though, that way you can check 
exactly what is being executed.
   Richard Huxton
   Archonet Ltd

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