Re: Question about DROP TABLE

Hi,

On 2016-01-12 12:17:01 +0100, Michal Novotny wrote:
> thanks a lot for your reply. Unfortunately I've found out most it didn't
> really start DROP TABLE yet and it's locked on autovacuum running for
> the table and even if I kill the process it's autostarting again and again.

Start the DROP TABLE and *then* cancel the autovacuum session. That
should work.

> Is there any way how to do the DROP TABLE and bypass/disable autovacuum
> entirely? Please note the "autovacuum = off" is set in the config file
> (postgresql.conf).

That actually is likely to have caused the problem. Every
autovacuum_freeze_max_age tables need to be vacuumed - otherwise the
data can't be interpreted correctly anymore at some point. That's called
'anti-wraparound vacuum". It's started even if you disabled autovacuum,
to prevent database corruption.

If you disable autovacuum, you really should start vacuums in some other
way.

Greetings,

Andres Freund