Re: Regression test postgres_fdw might fail due to autovacuum

Hi,

On 2025-03-24 02:26:35 +0900, Fujii Masao wrote:
> > With autovacuum = off, all of these fluctuations go away.
>
> So you are suggesting disabling autovacuum during the postgres_fdw regression test?

I don't think that's a good fix in this case.

> Just my idea to stabilize the test with "RETURNING *" is to use WITH, like this:
>
> WITH tmp AS (UPDATE ... RETURNING *) SELECT * FROM tmp ORDER BY ...

+1

On 2025-03-23 16:00:00 +0200, Alexander Lakhin wrote:
> Interestingly enough, with "log_autovacuum_min_duration = 0" added to
> TEMP_CONFIG, I can't see "automatic vacuum/analyze" messages related
> to ft2/ "S 1"."T 1", so autovacuum somehow affects contents of this table
> indirectly.
>
> With autovacuum = off, all of these fluctuations go away.

Hm. Is it possible that autovacuum started but didn't finish?

FWIW, I observed some oddities around autovacuum=0 recently, but didn't have
time to track the source down yet. E.g. running pg_trgm's tests against a
server with autovacuum=0 results in test failures due to plan changes, despite
no AVs getting launched.

Greetings,

Andres