Re: BUG #16691: Autovacuum stops processing certain databases until postgresql rebooted

čt 29. 10. 2020 v 22:44 odesílatel PG Bug reporting form <
noreply(at)postgresql(dot)org> napsal:

> The following bug has been logged on the website:
>
> Bug reference: 16691
> Logged by: Max Vikharev
> Email address: bm(dot)kinder(at)gmail(dot)com
> PostgreSQL version: 12.3
> Operating system: Ubuntu 16.04.5 LTS
> Description:
>
> Hi,
>
> Previously i've reported BUG # 16620. But there is no answer on my new
> mails, so i have to open this new report.
>
> Currently we have to restart postgresql 12.3 every 5-7 days to make it
> work
> properly on 5 terabyte cluster with ~ 50 databases. The problem is that
> autovacuum stops to process certain databases and cycles on the only one...
> Until we restart cluster.
>
> We've made a trigger and now detecting very situation when it happen. And
> it
> happen every 5-7 day.
> So postgresql is loosing actual statistic, we see not effecttive plans, we
> need to restart postgresql and also we have to run vacuum full explicitly
> frequently. So this all is huge headake.
>

please, check open transactions. Restart, close all sessions, all
transactions.

Did you check pg_stat_activity if there are some sessions in state "idle in
transactions" before restart?

Regards

Pavel

>
> Please help us investigate the roots of problem.
>
>