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Two-Phase Locking Definition

(2PL) A Database locking protocol. Adhering to 2PL means that transactions are each split into two phases: the Growing Phase followed by the Shrinking Phase. The Growing phase involves the transaction gaining all the locks it requires and the Shrinking Phase involves releasing all those locks. 2PL does not mean that all lock acquisitions and releases have to take place one after the other with no other processing between them. It simply enforces the overall order in which locks are gained and released.

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