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Which of the following protocols ensures conflict serializability and safety from deadlocks?

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Which of the following protocols ensures conflict serializability and safety from deadlocks? (a) Two-phase locking protocol (b) Time-stamp ordering protocol (c) Graph based protocol (d) None of the mentioned I got this question by my school principal while I was bunking the class. This intriguing question originated from Lock-Based Protocols topic in portion Concurrency Control of Database Management

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The correct answer is (b) Time-stamp ordering protocol To explain: Time-stamp ordering protocol ensures conflict serializability and safety from deadlocks.

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