Hannu Krosing <hannu@krosing.net> writes:
> btw, when is a transaction id currently assigned to a transaction - when
> INSERT/UPDATE/DELETE statement is first seen, or when data is actually
> modified ?
AFAIR it doesn't happen until the XID is needed to stamp a tuple with.
(There might be some other places that demand the current XID, but
that's the normal case.)
regards, tom lane
