>
> Uh, txid_current returns a 64 bit value, whereas xmin only stores the 32
> least significant bits. They would certainly differ after a xid
> wraparound.
>
> --
> Álvaro Herrera http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
Ah yes... That would be a problem. What about using just the lower 32
bits of the txid_current?