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

From Steeve Boulanger
Subject Re: Database stats ( pg_stat_database.stats_reset ) get reset on daily basis - why?
Date
Msg-id CAAiSvx9CangeS_yZ6RLXsXHBZSKmuRvrcB39DNSB_Ler3=OhTw@mail.gmail.com
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In response to Re: Database stats ( pg_stat_database.stats_reset ) get reset on daily basis - why?  (Adrian Klaver <adrian.klaver@aklaver.com>)
Responses Re: Database stats ( pg_stat_database.stats_reset ) get reset on daily basis - why?
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What is the [2] referring to?

Number of the log line for each session or process, starting at 1

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.

Very plausible. I thought the same too.

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.  

-Steeve

On Fri, Nov 22, 2024 at 11:18 AM Adrian Klaver <adrian.klaver@aklaver.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.klaver@aklaver.com

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