Re: Feature improvement: can we add queryId for pg_catalog.pg_stat_activity view?

On Wed, Oct 14, 2020 at 10:34:31PM +0800, Julien Rouhaud wrote:
> On Wed, Oct 14, 2020 at 10:31 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >
> > Bruce Momjian <bruce@momjian.us> writes:
> > > Is there a measureable overhead when this is turned on, since it is off
> > > by default and maybe should default to on.
> >
> > I don't believe that "default to on" can even be in the discussion.
> > There is no in-core feature that would use this by default.
> 
> If the 2nd patch is applied there would be pg_stat_activity.queryid
> column, but I doubt that's a strong enough argument.

There is that, and log_line_prefix, which I can imaging being useful. 
My point is that if the queryid is visible, there should be a reason it
defaults to show empty.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

  The usefulness of a cup is in its emptiness, Bruce Lee