supremum record
A pseudo-record in an index, representing the gap above the largest value in that index. If a transaction has a statement such as SELECT ... FOR UPDATE ... WHERE col > 10;, and the largest value in the column is 20, it is a lock on the supremum record that prevents other transactions from inserting even larger values such as 50, 100, and so on.
See also gap.
See also infimum record.
See also pseudo-record.