| From: | Hari Krishna Sunder <hari(dot)db(dot)pg(at)gmail(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, Robert Treat <rob(at)xzilla(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(at)paquier(dot)xyz>, jian he <jian(dot)universality(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Matthias van de Meent <boekewurm+postgres(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>, alvherre(at)alvh(dot)no-ip(dot)org |
| Subject: | Re: Statistics Import and Export |
| Date: | 2025-05-20 17:32:39 |
| Message-ID: | CAAeiqZ0jqtJaigLa6WDAskRFM4gDCj3hNxmwiWs+wHU0gxCTKQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
Ah ya, forgot that reltuples are not always accurate. This sounds
reasonable to me.
On Mon, May 19, 2025 at 2:32 PM Nathan Bossart <nathandbossart(at)gmail(dot)com>
wrote:
> On Mon, May 19, 2025 at 02:13:45PM -0700, Hari Krishna Sunder wrote:
> > I think it would be better to revert 9879105 since there can be a
> > considerable number of true empty tables that we don´t need to process.
>
> I'm not sure that's a use-case we really need to optimize. Even with
> 100,000 empty tables, "vacuumdb --analyze-only --missing-stats-only --jobs
> 64" completes in ~5.5 seconds on my laptop. Plus, even if reltuples is 0,
> there might actually be rows in the table, in which case analyzing it will
> produce rows in pg_statistic.
>
> --
> nathan
>
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