Re: pg_last_xact_replay_timestamp meaning

Robert Haas wrote:
> On Fri, Mar 18, 2011 at 7:23 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > I just applied a doc patch for pg_last_xact_replay_timestamp, and the
> > text now says:
> >
> > ? ? ? <entry>Get timestamp of last transaction replayed during recovery.
> > ? ? ? ?This is the time at which the commit or abort WAL record for that
> > ? ? ? ?transaction was generated on the primary.
> > ? ? ? ?If no transactions have been replayed during recovery, this function
> > ? ? ? ?returns NULL. ?Otherwise, if recovery is still in progress this will
> > ? ? ? ?increase monotonically. ?If recovery has completed then this value will
> > ? ? ? ?remain static at the value of the last transaction applied during that
> > ? ? ? ?recovery. ?When the server has been started normally without recovery
> > ? ? ? ?the function returns NULL.
> >
> > Is this really the last commit/abort record or the last WAL record?
> > What should it be? ?Is the name of this function correct? ?Do we care
> > only about commit/abort records? Why?
>
> Commit and abort records have a timestamp. Other WAL records don't.

OK, thanks.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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