Define two-phase locking protocol, Database Management System

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Define two-phase locking protocol.

Ans: Two-phase locking is significance in the context of ensuring that schedules are serializable. The two-phase locking protocol defines a process each transaction follows.

The two-phase locking protocol

1. Previous to operating on any row, a transaction must obtain a lock on that row.

2. After releasing a lock, a transaction should never obtain any more locks.

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