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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

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 Correct Answer Logical operation

It is important that the lower-level locks acquired during an operation are sufficient to perform a subsequent logical undo of the operation.

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