Re: Database stats ( pg_stat_database.stats_reset ) get reset on daily basis - why?

On 23/11/2024 13:06, Steeve Boulanger wrote:
>
> > The above is some garden variety select?
>
> Not 100% sure what the expression "garden variety select" means lol,
> but I'll take a guess that it means an "select from an in-house
> application"  .. and yes it is.

Here (Ireland) we sometimes say "common-or-garden variety".... It means
a normal, everyday variety. :-)

Ray.

>
> -Steeve
>
> On Fri, Nov 22, 2024 at 11:18 AM Adrian Klaver
> <adrian(dot)klaver(at)aklaver(dot)com> wrote:
>
> On 11/21/24 15:50, Steeve Boulanger wrote:
> >  > 1) Do the 77 share some trait the other 80 don't.
> >
> > No pattern found yet .. but still verifying a few things
> >
> >  > 2) Do the OS system logs reveal anything?
> >
> > Nothing found in syslog
> >
> >  > 3) What was happening in the databases just prior to the time
> the stats
> > reset?
> >
> > Here's an example (log extracts) for a stats reset occurrence:
> >
> > select datname, stats_reset, now()-stats_reset as since_reset
> > from pg_stat_database
> > where ( now()-stats_reset ) < interval '1 day'
> > order by 3  limit 1;
> >
> >      datname     |          stats_reset          | since_reset
> > ----------------+-------------------------------+-----------------
> > MyDB           | *2024-11-21 13:48:34.332*785+00 | 00:00:22.266304
> >
> > <--LOGS-->
> > 2024-11-21 13:48:34.324 UTC pid=[322035][2]  db=[MyDB] usr=[user1]
> > client=[host1] app=[[unknown]]LOG: connection authorized:
> user=user1
> > database=MyDB applicatio
> > n_name=app1 <..>
>
> What is the [2] referring to?
>
> >
> > <.. no calls at "2024-11-21 13:48:34.332" - WHY?? ..>
>
> My guess is the difference in time it takes to log the action and set
> the log timestamp. Whereas the stats_reset value is the timestamp
> when
> the stats system actually did the reset.
>
> >
> > 2024-11-21 13:48:34.336 UTC pid=[322035][3]  db=[MyDB] usr=[user1]
> > client=[host1] app=[app1]LOG:  duration: 1.071 ms parse <unnamed>:
> > SELECT <..>
>
> The above is some garden variety select?
>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
>

--
Raymond O'Donnell // Galway // Ireland
ray(at)rodonnell(dot)ie