On Fri, 14 Apr 2023 at 13:15, Laurenz Albe <laurenz.albe@cybertec.at> wrote:
>
> On Fri, 2023-04-14 at 18:43 +0200, Alvaro Herrera wrote:
> > On 2023-Apr-14, Greg Stark wrote:
> > > I assume people would use hot_standby_feedback if they have streaming
> > > replication.
> >
> > Yes, either that or a replication slot.
>
> A replication slot doesn't do anything against snapshot conflicts,
> which is what we are discussing here. Or are we not?
They're related -- the replication slot holds the feedback xmin so
that if your standby disconnects it can reconnect later and not have
lost data in the meantime. At least I think that's what I think it
does -- I don't know if I'm just assuming that, but xmin is indeed in
pg_replication_slots.
--
greg