Re: Log duration and statement for slow queries + limiting the number of log files generated

On 16 September 2011 18:16, Alec Swan <alecswan(at)gmail(dot)com> wrote:
> Hello,
>
> I am trying to get postgres 8.4.4 to log the duration and statement of
> queries that take longer than 200 ms. I played with the log settings
> in postgresql.conf but I still see logs of durations of very fast
> statements. Here is my current configuration:
>
> log_min_duration_statement = 200
> log_duration = on
> log_line_prefix = '<%t> '
> log_statement = 'all'
>
> With this configuration I am still getting these in the log files:
>
> <2011-09-02 14:47:19 EDT> LOG:  duration: 0.017 ms
> <2011-09-02 14:47:19 EDT> LOG:  execute <unnamed>: SET SESSION
> CHARACTERISTICS AS TRANSACTION READ WRITE
> <2011-09-02 14:47:19 EDT> LOG:  duration: 0.004 ms
> <2011-09-02 14:47:19 EDT> LOG:  duration: 0.014 ms
> <2011-09-02 14:47:19 EDT> LOG:  duration: 0.017 ms
> <2011-09-02 14:47:19 EDT> LOG:  execute <unnamed>: SET SESSION
> CHARACTERISTICS AS TRANSACTION READ ONLY
>
>
> How do I filter these out?

You have log_statement set to 'all', and since it's mostly independent
of log_min_duration_statement, it's logging everything anyway. You
may wish to just set log_statement to 'none'.

> Also, how do I restrict the maximum number of log files generated to 2
> with the assumption that they will roll over when filled?

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