GATE | GATE MOCK 2017 | Question 33

Which of the following statement is/are incorrect?

A: A schedule following strict two phase locking protocol is conflict serializable as well as recoverable.
B: Checkpoint in schedules are inserted to ensure recoverability.
(A) Only 1

(B) Only 2

(C) Both 1 and 2

(D) None

Answer: (B)

Explanation: Basic two phase locking protocol ensures only conflict serializability and strict two phase locking protocol ensures recoverability as well. So statement A is correct. Checkpoints are inserted to minimize the task of undo-redo in recoverability. So, statement B is not correct. Hence correct option B is correct choice.

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