> I see no concurrency problems. If two or more backends visit the same > tuple, they either write the same value to the same position which > doesn't hurt, or one sees the other's changes which is a good thing.
AFAIR, on multi-CPU platforms it's possible that second transaction could see COMMITTED state but still old (subtrans id) in xmin: it's not guaranteed that changes made on CPU1 (V1 was changed first, then V2 was changed) will appear at the same order on CPU2 (V2 may come first, then V1). Vadim _____________________________________________________ Revere Data, LLC, formerly known as Sector Data, LLC, is not affiliated with Sector, Inc., or SIAC. ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
