Re: compute_query_id and pg_stat_statements

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Julien Rouhaud <rjuju123(at)gmail(dot)com>
Cc: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephen Frost <sfrost(at)snowman(dot)net>, Christoph Berg <myon(at)debian(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: compute_query_id and pg_stat_statements
Date: 2021-05-14 12:35:14
Message-ID: 20210514123514.GB22344@momjian.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

On Thu, May 13, 2021 at 09:41:42PM -0400, Bruce Momjian wrote:
> On Fri, May 14, 2021 at 09:40:15AM +0800, Julien Rouhaud wrote:
> > On Fri, May 14, 2021 at 8:13 AM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > >
> > > On Thu, May 13, 2021 at 08:04:37PM -0400, Álvaro Herrera wrote:
> > > > Here's a first attempt at what was suggested. If you say "auto" it
> > > > remains auto in SHOW, but it gets enabled if a module asks for it.
> > > >
> > > > Not final yet, but I thought I'd throw it out for early commentary ...
> > >
> > > I certainly like this idea better than having the extension change the
> > > output of the GUC.
> >
> > Oh, I didn't understand that it was the major blocker. I'm fine with it too.
>
> I think if we keep the output as 'auto', and document that you check
> pg_stat_activity for a hash to see if it is enabled, that gets us pretty
> far.

I think keeping the output as 'auto', and documenting that this query
must be run to determine if the query id is being computed:

SELECT query_id
FROM pg_stat_activity
WHERE pid = pg_backend_pid();

is the right approach.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Bruce Momjian 2021-05-14 12:57:41 Re: compute_query_id and pg_stat_statements
Previous Message Bharath Rupireddy 2021-05-14 12:30:04 Re: parallel vacuum - few questions on docs, comments and code