Re: min_safe_lsn column in pg_replication_slots view

On Mon, Jun 22, 2020 at 11:19 AM Michael Paquier <michael@paquier.xyz> wrote:
>
> On Sat, Jun 20, 2020 at 03:53:54PM +0900, Michael Paquier wrote:
> > On Sat, Jun 20, 2020 at 09:45:52AM +0530, Amit Kapila wrote:
> >> Isn't this information specific to checkpoints, so maybe better to
> >> display in view pg_stat_bgwriter?
> >
> > Not sure that's a good match.  If we decide to expose that, a separate
> > function returning a LSN based on the segment number from
> > XLogGetLastRemovedSegno() sounds fine to me, like
> > pg_wal_last_recycled_lsn().  Perhaps somebody has a better name in
> > mind?
>
> I was thinking on this one for the last couple of days, and came up
> with the name pg_wal_oldest_lsn(), as per the attached, traking the
> oldest WAL location still available.
>

I feel such a function is good to have but I am not sure if there is a
need to tie it with the removal of min_safe_lsn column.

-- 
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com