2011/9/17 pasman pasmański <pasman.p@gmail.com>:
> Trigger may store timestamp to other table "timestamps". You join then
> xmin with xmin from this table to access timestamp.
But note that this is not reliable. Vacuum *does* change xmin during
the freeze process, as does a pg_dump&reload of data. Possibly other
cases that I didn't think of. I wouldn't use this hack in a real
application.
Regards,
Marti