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To perform logical redo or undo, the database state on disk must be operation ___________ that is, it should not have partial effects of any operation.

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To perform logical redo or undo, the database state on disk must be operation ___________ that is, it should not have partial effects of any operation.

(a) Persistent

(b) Resistant

(c) Consistent

(d) None of the mentioned

This question was addressed to me in unit test.

My question comes from Lock Release and Undo Operations topic in chapter Recovery System of Database Management

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Correct choice is (c) Consistent

Easy explanation - Data structures such as B+-trees would not be in a consistent state, and neither logical redo nor logical undo operations can be performed on an inconsistent data structure.

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