David Saracini <dsaracini@yahoo.com> writes:
> So, if I understand it... then, txid_current returns the xmax in the
> high-order and the xmin in the low-order. Correct?
No. txid_current returns a monotonically increasing version of the
transaction counter --- its high order bits are an "epoch" counter
that increases whenever the 32-bit xid wraps around.
regards, tom lane