Re: Background Processes and reporting

12 марта 2016 г., в 13:59, Amit Kapila <amit.kapila16@gmail.com> написал(а):

On Sat, Mar 12, 2016 at 3:10 AM, Andres Freund <andres@anarazel.de> wrote:
>
>
> > Similarly for the wait event stuff - checkpointer, wal writer,
> > background writer are in many cases processes that very often are
> > blocked on locks, IO and such.  Thus restricting the facility to
> > database connected processes seems like a loss.
>
> I think one way to address this would be to not only report
> PgBackendStatus type processes in pg_stat_activity. While that'd
> obviously be a compatibility break, I think it'd be an improvement.
>

I think here another point which needs more thoughts is that many of the pg_stat_activity fields are not relevant for background processes, ofcourse one can say that we can keep those fields as NULL, but still I think that indicates it is not the most suitable way to expose such information.

Another way could be to have new view like pg_stat_background_activity with only relevant fields or try expose via individual views like pg_stat_bgwriter.

Do you intend to get this done for 9.6 considering an add-on patch for wait event information displayed in pg_stat_activity?

With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com