Horton

Re: per backend WAL statistics

Bertrand Drouvot <bertranddrouvot.pg@gmail.com>

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From: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: Andres Freund <andres@anarazel.de>, pgsql-hackers@lists.postgresql.org, Nazir Bilal Yavuz <byavuz81@gmail.com>
Date: 2025-02-17T06:59:40Z
Lists: pgsql-hackers 
Hi,

On Thu, Feb 06, 2025 at 10:28:48AM +0000, Bertrand Drouvot wrote:
> Hi,
> 
> On Thu, Feb 06, 2025 at 10:38:55AM +0900, Michael Paquier wrote:
> > On Wed, Feb 05, 2025 at 02:28:08PM +0000, Bertrand Drouvot wrote:
> > > Agree, I'll start a dedicated thread for that.
> > 
> > Thanks.
> 
> Done in [1].
> 
> [1]: https://www.postgresql.org/message-id/flat/Z6SOha5YFFgvpwQY%40ip-10-97-1-34.eu-west-3.compute.internal

Thanks for having committed the work done in [1] above.

There is still something that would simplify what is done here: it's the
"the elimination of the write & sync columns for pg_stat_wal" mentioned in [2].

I'll add it in the new patch serie for this thread (that simplifies the new 
pg_stat_wal_build_tuple() among other things) unless Nazir beat me to it.

[2]: https://www.postgresql.org/message-id/Z6L3ZNGCljZZouvN%40paquier.xyz

Regards,

-- 
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com

Commits

  1. Fix use-after-free in pgstat_fetch_stat_backend_by_pid()

  2. Remove initialization from PendingBackendStats

  3. Add WAL data to backend statistics

  4. Improve check for detection of pending data in backend statistics

  5. Fix some gaps in pg_stat_io with WAL receiver and WAL summarizer

  6. Handle auxiliary processes in SQL functions of backend statistics

  7. Invent pgstat_fetch_stat_backend_by_pid()

  8. Refactor code of pg_stat_get_wal() building result tuple

  9. Adding new PgStat_WalCounters structure in pgstat.h

  10. Remove pgstat_flush_wal()

  11. Refactor some code related to backend statistics

  12. Add backend-level statistics to pgstats