GATE CS 2016 Set 1 — Question 61

MCQ+2 / -0.67MediumLock-Based ProtocolsTransactions & ConcurrencyDatabasesTwo-Phase LockingDeadlock PreventionDeadlocksOperating System

Databases → Deadlocks → Deadlock Prevention

Last updated 5 September 2026

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Correct answer (A) guarantee serializability and deadlock-freedom Solution 1. Deadlock-freedom: The protocol requires acquiring locks in a specific global order (increasing order of addresses). This prevents the "circular wait" condition necessary for deadlock. Thus, the system is deadlock-free. 2. Serializability: The protocol follows the Two-Phase Locking (2PL) rule (all locks acquired in growing phase, released in shrinking phase). In fact, this is a strict form called Conservative or Static 2PL where all locks are pre-claimed. 2PL ensures conflict serializability. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) guarantee serializability and deadlock-freedom Solution 1. Deadlock-freedom: The protocol requires acquiring locks in a specific global order (increasing order of addresses). This prevents the "circular wait" condition necessary for deadlock. Thus, the system is deadlock-free. 2. Serializability: The protocol follows the Two-Phase Locking (2PL) rule (all locks acquired in growing phase, released in shrinking phase). In fact, this is a strict form called Conservative or Static 2PL where all locks are pre-claimed. 2PL ensures conflict serializability.

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