Horton

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

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Julien Rouhaud <rjuju123@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Tom Lane <tgl@sss.pgh.pa.us>, Nitin Jadhav <nitinjadhavpostgres@gmail.com>, Hannu Krosing <hannuk@google.com>, Robert Haas <robertmhaas@gmail.com>, Pavel Stehule <pavel.stehule@gmail.com>, Michael Paquier <michael@paquier.xyz>, torikoshia <torikoshia@oss.nttdata.com>, Atsushi Torikoshi <atorik@gmail.com>, Tatsuro Yamada <tatsuro.yamada.tf@nttcom.co.jp>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Evgeny Efimkin <efimkin@yandex-team.ru>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2021-04-08T16:48:47Z
Lists: pgsql-hackers 
On Fri, Apr  9, 2021 at 12:38:29AM +0800, Julien Rouhaud wrote:
> On Thu, Apr 08, 2021 at 11:34:25AM -0400, Bruce Momjian wrote:
> > 
> > OK, let's get some details.  First, pg_stat_statements.queryid already
> > exists (no underscore), and I don't think anyone wants to change that. 
> > 
> > pg_stat_activity.queryid is new, but I can imagine cases where you would
> > join pg_stat_activity to pg_stat_statements to get an estimate of how
> > long the query will take --- having one using an underscore and another
> > one not seems odd.
> 
> Indeed, and also being able to join with a USING clause rather than an ON could
> also save some keystrokes.  But unfortunately, we already have (userid, dbid)
> on pg_stat_statements side vs (usesysid, datid) on pg_stat_activity side, so
> this unfortunately won't fix all the oddities.

Wow, good point.  Shame they don't match.

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

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

Commits

  1. Clarify description of pg_stat_statements columns

  2. Fix wording in description of pg_stat_statements.toplevel

  3. Mention that toplevel is part of pg_stat_statements key.

  4. adjust query id feature to use pg_stat_activity.query_id

  5. Update copyright for 2021

  6. Take the statistics collector out of the loop for monitoring backends'