| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Andres Freund <andres(at)anarazel(dot)de>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Darafei Komяpa Praliaskouski <me(at)komzpa(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Michael Banck <mbanck(at)gmx(dot)net> |
| Subject: | Re: Berserk Autovacuum (let's save next Mandrill) |
| Date: | 2020-04-02 20:49:14 |
| Message-ID: | CAApHDvrEuNY75udRpxLLP-fzmEvRVQ6tEG=NqL5TxAghY-gPuQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, 3 Apr 2020 at 04:46, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> I wrote:
> > I'd be inclined to undo what you did in favor of initializing the
> > test tables to contain significantly different numbers of rows,
> > because that would (a) achieve plan stability more directly,
> > and (b) demonstrate that the planner is actually ordering the
> > tables by cost correctly. Maybe somewhere else we have a test
> > that is verifying (b), but these test cases abysmally fail to
> > check that point.
>
> Concretely, I suggest the attached, which replaces the autovac disables
> with adjusting partition boundaries so that the partitions contain
> different numbers of rows.
I've looked over this and I agree that it's a better solution to the problem.
I'm happy for you to go ahead on this.
David
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