> On Tue, Dec 10, 2019 at 09:42:17AM +0900, Kyotaro Horiguchi wrote: > > At Tue, 10 Dec 2019 00:44:09 +0100, Tomas Vondra <tomas.vondra@2ndquadrant.com> wrote in
> > I'm not sure how much xact_start for walsender is useful and we really > > is not running a statement there. Also autovac launcher starts > > transaction without a valid statement timestamp perhaps for the same > > reason. > > Maybe, but then maybe we should change it so that we don't report any > timestamps for such processes.
Yeah, I think we should to that.
Agreed. Don't report a transaction start timestamp at all if we're not in a read/write txn in the walsender, which we should never be when using a historic snapshot.
It's not interesting or relevant.
Reporting the commit timestamp of the current or last-processed xact would likely just be fonfusing. I'd rather see that in pg_stat_replication if we're going to show it, that way we can label it usefully.
