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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

(a) Logical operation

(b) Redo operation

(c) Logical undo operation

(d) Undo operation

This question was addressed to me in an interview for internship.

Question is from Lock Release and Undo Operations in division Recovery System of Database Management

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The correct option is (a) Logical operation

The best I can explain: 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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