Re: pgsql: autovacuum: handle analyze for partitioned tables

On Wed, Apr 21, 2021 at 07:06:49PM -0400, Alvaro Herrera wrote:
> On 2021-Apr-09, Robert Haas wrote:
> > Does this need to worry about new partitions getting attached to a
> > partitioned table, or old ones getting detached? (Maybe it does
> > already, not sure.)
>
> I was pinged because this is listed as an open item. I don't think it
> is one. Handling ATTACH/DETACH/DROP is important for overall
> consistency, of course, so we should do it eventually, but the fact that
> autovacuum runs analyze *at all* for partitioned tables is an enormous
> step forward from it not doing so. I think we should treat ATTACH/
> DETACH/DROP handling as a further feature to be added in a future
> release, not an open item to be fixed in the current one.

I think this is okay, with the caveat that we'd be changing the behavior
(again) in a future release, rather than doing it all in v14.

Maybe the behavior should be documented, though. Actually, I thought the
pre-existing (non)behavior of autoanalyze would've been documented, and we'd
now update that. All I can find is this:

https://www.postgresql.org/docs/current/sql-analyze.html
|The autovacuum daemon, however, will only consider inserts or updates on the
|parent table itself when deciding whether to trigger an automatic analyze for
|that table

I think that should probably have been written down somewhere other than for
the manual ANALYZE command, but in any case it seems to be outdated now.

--
Justin