| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Stephen Frost <sfrost(at)snowman(dot)net>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
| Subject: | Re: Statistics Import and Export |
| Date: | 2024-05-16 00:02:57 |
| Message-ID: | 10f251857a13cfc799079ba89d50b135c974a18e.camel@j-davis.com |
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| Lists: | pgsql-hackers |
On Mon, 2024-05-06 at 23:43 -0400, Corey Huinker wrote:
>
> v21 attached.
>
> 0003 is the statistics changes to pg_dump, adding the options -X / --
> statistics-only, and the derivative boolean statisticsOnly. The -P
> option is already used by pg_restore, so instead I chose -X because
> of the passing resemblance to Chi as in the chi-square statistics
> test makes it vaguely statistics-ish. If someone has a better letter,
> I'm listening.
>
> With that change, people should be able to use pg_dump -X --table=foo
> to dump existing stats for a table and its dependent indexes, and
> then tweak those calls to do tuning work. Have fun with it. If this
> becomes a common use-case then it may make sense to get functions to
> fetch relation/attribute stats for a given relation, either as a
> formed SQL statement or as the parameter values.
Can you explain what you did with the
SECTION_NONE/SECTION_DATA/SECTION_POST_DATA over v19-v21 and why?
Regards,
Jeff Davis
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