Re: another autovacuum scheduling thread

On Thu, 26 Mar 2026 at 10:18, Nathan Bossart <nathandbossart(at)gmail(dot)com> wrote:
>
> On Wed, Mar 25, 2026 at 02:12:16PM -0700, Bharath Rupireddy wrote:
> > Would it make sense to recompute scores and re-sort the remaining
> > table list after each table is processed in do_autovacuum()'s main
> > loop - say, after a certain amount of time spent vacuuming the large
> > table(s)? This would catch the above scenarios. I see that the scores
> > per table are being calculated in relation_needs_vacanalyze, but they
> > are ignored in the recheck path (table_recheck_autovac ->
> > recheck_relation_needs_vacanalyze -> relation_needs_vacanalyze).
>
> I think this was discussed a bit upthread, and we decided to leave it out
> for now. But things like reprioritization and automatic cost limit
> adjustments seem worth considering for v20.

Agreed. I think the reason you mentioned in [1] was a good reason not
to do this.

There are also other autovacuum workers that may be calculating a more
up-to-date list. They may well process the table that's increased
score before the worker with the slightly stale list makes it there.
That seems fine and natural to me.

David

[1] https://postgr.es/m/aROY-MUVO_mYTl2f%40nathan