Re: idea: log_statement_sample_rate - bottom limit for sampling

Gilles Darold <gilles@darold.net>

From: Gilles Darold <gilles@darold.net>

To: Pavel Stehule <pavel.stehule@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>

Date: 2019-06-06T08:48:28Z

Lists: pgsql-hackers

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Revert "Add log_statement_sample_rate parameter"
- 75506195da81 13.0 landed
- d5f53a8e26ca 12.0 landed
Revert "Silence compiler warning"
- 4f9ed8f3c5ef 13.0 landed
- d8453ccfbfd6 12.0 landed

Le 06/06/2019 à 10:38, Pavel Stehule a écrit :
> Hi
>
> I like the idea of sampling slow statements via 
> log_statement_sample_rate. But I miss some parameter that can ensure
> so every query executed over this limit is logged.
>
> Can we introduce new option
>
> log_statement_sampling_limit
>
> The query with execution time over this limit is logged every time.
>
> What do you think about this?
>
> Regards
>
> Pavel


+1, log_min_duration_statement is modulated by log_statement_sample_rate
that mean that there is no more way to log all statements over a certain
duration limit. log_statement_sampling_limit might probably always be
upper than log_min_duration_statement.


-- 
Gilles Darold
http://www.darold.net/