Re: compute_query_id and pg_stat_statements

On Fri, May 14, 2021 at 08:57:41AM -0400, Bruce Momjian wrote:
> On Fri, May 14, 2021 at 08:35:14AM -0400, Bruce Momjian wrote:
> > On Thu, May 13, 2021 at 09:41:42PM -0400, Bruce Momjian wrote:
> > > 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.
> 
> Actually, we talked about huge_pages = try needing to use OS commands to
> see if huge pages are being used, so requiring an SQL query to see if
> query id is being computed seems reasonable.

I totally agree.