Once the lower-level lock is released, the operation cannot be undone – McqOptions

MCQOPTIONS

1.	Once the lower-level lock is released, the operation cannot be undone by using the old values of updated data items, and must instead be undone by executing a compensating operation; such an operation is called
A.	logical operation
B.	redo operation
C.	logical undo operation
D.	undo operation
Answer» B. redo operation

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