Re: Postgres auto vacuum - Disable

From: Julien Rouhaud <rjuju123(at)gmail(dot)com>
To: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
Cc: "Karthik Jagadish (kjagadis)" <kjagadis(at)cisco(dot)com>, Dave Page <dpage(at)pgadmin(dot)org>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, "Chandruganth Ayyavoo Selvam (chaayyav)" <chaayyav(at)cisco(dot)com>, "Prasanna Satyanarayanan (prassaty)" <prassaty(at)cisco(dot)com>, "Jaganbabu M (jmunusam)" <jmunusam(at)cisco(dot)com>, "Joel Mariadasan (jomariad)" <jomariad(at)cisco(dot)com>
Subject: Re: Postgres auto vacuum - Disable
Date: 2022-11-07 13:36:03
Message-ID: 20221107133603.6kgafr7vd7oyjgs7@jrouhaud
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On Mon, Nov 07, 2022 at 02:22:56PM +0100, Laurenz Albe wrote:
> On Mon, 2022-11-07 at 12:12 +0000, Karthik Jagadish (kjagadis) wrote:
> > I have follow-up question where the vacuum process is waiting and not doing it’s job.
> > When we grep on waiting process we see below output. Whenever we see this we notice
> > that the vacuum is not happening and the system is running out of space.
> >  
> > [root(at)zpah0031 ~]# ps -ef | grep 'waiting'
> > postgres  8833 62646  0 Jul28 ?        00:00:00 postgres: postgres cgms [local] VACUUM waiting
> > postgres 18437 62646  0 Jul27 ?        00:00:00 postgres: postgres cgms [local] VACUUM waiting
> >  
> >  
> > What could be the reason as to why the vacuum is not happening? Is it because some lock is
> > present in the table/db or any other reason?
> Look in "pg_stat_activity". I didn't check, but I'm sure it's the intentional break
> configured with "autovacuum_vacuum_cost_delay". Reduce that parameter for more
> autovacuum speed.

Really? An autovacuum should be displayed as "autovacuum worker", this looks
like plain backends to me, where an interactive VACUUM has been issued and is
waiting on a heavyweight lock.

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