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The undo and redo operations must be _________ to guarantee correct behaviour, even if a failure occurs during recovery process.

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The undo and redo operations must be _________ to guarantee correct behaviour, even if a failure occurs during recovery process.

(a) idempotent

(b) easy

(c) protected

(d) all of the mentioned

The question was asked in an interview.

This interesting question is from Atomic Transactions topic in chapter Process Synchronization of Operating System

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The correct option is (a) idempotent

To explain: Idempotent – Multiple executions of an operation have the same result as does one execution.

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