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Re: DB Cluster hanging

From: "codeWarrior" <gpatnude(at)hotmail(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: DB Cluster hanging
Date: 2005-10-13 15:48:36
Message-ID: dilvje$13nr$ (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Are you possibly running logrotate on the postgreSQL server logs ? Logrotate 
is usually set to signal (SIGHUP) the log owner (in this case -- postgreSQL) 
after rotating the log file...

You normally can't just delete the logfiles and expect postgreSQL to 
continue wherever you left it... you normally need to pg_ctl reload or 
pg_ctl restart after dinking with the log files...

"Nigel Bishop" <nigel(dot)bishop(at)gmail(dot)com> wrote in message 
> Hi,
> I'm hoping that someone will be able to answer this query:
> Last night at 3am our Postgresql DB cluster hung.  At the time data
> was being loaded.  The parameter log_statement_stats in the
> postgresql.conf file was set to true.  This was churning out data into
> the logfile which was switching every 10Mb.  Eventually the partition
> where the logfiles are written to filled up  fair enough  this had
> been going on since about 5.30pm the previous evening and the logfiles
> were being generated at the rate of 4/5 a minute.  The partition was
> cleared of old logs and I expected the DB to spring in to life, but no
> it just sat there.  I could not connect with psql or pg_ctl to
> shutdown the cluster.
> Eventually I had to issue a kill -9 on the postmaster, set
> log_statement_stats to false and restarted the cluster, It recovered
> itself and the data load carried on.
> My question is, is this normal behaviour when the logfile destination
> fills up?  There was nothing in the logfile being used at the time of
> the hang, just stats data.
> PG version 8.0.3 with archived WAL logs enabled
> O/S version RH ES4 with 2 CPUs & 2Gb RAM
> Thanks very much for any input.
> Regards,
> Nigel Bishop
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend

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