On Mon, Dec 12, 2016 at 9:19 AM, Robert Haas <robertmh...@gmail.com> wrote:
> So, one of the problems in this patch as committed is that for any > process that doesn't show up in pg_stat_activity, there's no way to > see the wait event information. That sucks. I think there are > basically two ways to fix this: > > 1. Show all processes that have a PGPROC in pg_stat_activity, > including auxiliary processes and whatnot, and use some new field in > pg_stat_activity to indicate the process type. > > 2. Add a second view, say pg_stat_system_activity, to show the > processes that don't appear in pg_stat_activity. A bunch of columns > could likely be omitted, but there would be some duplication, too. > > Preferences? > > I'm inclined toward option 2. A view over both that involves just the shared columns would give you the benefits from option 1. Question: is there a parent-child relationship involved here? Given a record in today's pg_stat_activity is it useful/possible to link in all of the pg_stat_system_activity process that are working to fulfill the client-initiated task? Even with "system" we'd probably want to distinguish between background workers and true system maintenance processes. Or am I mis-interpreting the scope of this feature? David J.
