What is the expected behaviour of sequence numbers under pg concurrence model? E.g. ÂUncommitted transaction 1 in progress has inserted 5 tuples into table foo. ÂMeanwhile uncommitted transaction 2 in progress inserts 100 tuples into table foo. ÂIf the sequence number for the pk started at 1000 before these transactions, what are the sequence numbers for transaction 1, 2, and the final sequence number if they both commit? ÂOne rollback's? ÂBoth rollback? One hangs open while the other commits? ÂOne hang and one rollback's?
