| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Jeff Davis <pgsql(at)j-davis(dot)com>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, jian he <jian(dot)universality(at)gmail(dot)com>, Nathan Bossart <nathandbossart(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: | 2025-02-21 22:47:58 |
| Message-ID: | 3728741.1740178078@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Andres Freund <andres(at)anarazel(dot)de> writes:
> The times get way worse if you dump stats for catalog tables, because there
> some of arrays are regproc and regprocout calls FuncnameGetCandidates(), which
> then ends up iterating over a long cached list... I think that's basically
> O(N^2)?
Can't be that bad. I don't see any proname values that occur more
than 2 dozen times. You can call that a long list if you want,
but it's not scaling with the size of pg_proc.
> Of course that's nothing we should encounter frequently, but ugh.
Yeah, I can't get excited about the cost of that for normal user
dumps. The 002_pg_dump test does run a dump with --schema pg_catalog,
but it's dubious that that test is worth its cycles.
regards, tom lane
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