Hi,
On 2023-01-27 22:39:56 -0500, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > On 2023-01-28 11:38:50 +0900, Michael Paquier wrote:
> >> FWIW, my vote goes for a more expensive but reliable function even in
> >> stable branches.
>
> > I very strenuously object. If we make txid_current() (by way of
> > pg_current_xact_id()) flush WAL, we'll cause outages.
>
> What are you using it for, that you don't care whether the answer
> is trustworthy?
It's quite commonly used as part of trigger based replication tools (IIRC
that's its origin), monitoring, as part of client side logging, as part of
snapshot management.
txid_current() predates pg_xact_status() by well over 10 years. Clearly we had
lots of uses for it before pg_xact_status() was around.
Greetings,
Andres Freund