From: | "Zechman, Derek S" <Derek(dot)S(dot)Zechman(at)snapon(dot)com> |
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To: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | RE: analyze-in-stages post upgrade questions |
Date: | 2025-07-09 11:30:22 |
Message-ID: | PH0PR04MB8294E796D6297D4E3BE4EFB6C049A@PH0PR04MB8294.namprd04.prod.outlook.com |
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Lists: | pgsql-general pgsql-hackers |
> > Well, that wouldn't explain why it doesn't work on partitioned tables.
> > I am under the impression that it should.
> >
> > Derek, can cou share the pg_stats entries for the partitioned table?
>
> There are no entries in pg_stats for the parent table until after I manually run an analyze on it – Example below
You are right. I looked at the code, and "vacuumdb" does not process
partitiond tables, even if --analyze-only is specified. I find that
surprising, aince the SQL command ANALYZE (without a table name) will
also collect statistics for partitioned tables.
I think that it would be a good idea to change that behavior.
In particular, it makes a lot of sense to collect statistics for
partitioned tables after a "pg_upgrade".
Attached is a patch to make "vacuumdb --analyze-only" consider
partitioned tables as well.
Yours,
Laurenz Albe
Is there a plan to include this patch in future releases/patches of postgres?
Thanks,
(Derek) Sean
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