GATE | GATE MOCK 2017 | Question 33

Which of the following statement is/are incorrect?

1. A schedule following strict two phase locking protocol is conflict serializable as well as recoverable.
2. 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 (1) is correct.
Checkpoints are inserted to minimize the task of undo-redo in recoverability. So, statement (2) is not correct.

Option (B) is correct.

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