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Answer :
The purpose of the 2PL protocol is to prevent conflicts between multiple transactions accessing the same data simultaneously and ensure data consistency through a two-phase locking mechanism.
What is the purpose of the 2PL (Two-Phase Locking) protocol in database management systems?
The 2PL (Two-Phase Locking) protocol is a concurrency control method used in database management systems to prevent conflicts between multiple transactions accessing the same data simultaneously.
In this protocol, all locks are acquired in two phases: the first phase is the "growing" phase where the transaction acquires all necessary locks, and the second phase is the "shrinking" phase where the transaction releases all locks.
One important feature of the 2PL protocol is that in every schedule, all unlocks follow all locks. This means that any transaction has to request all the locks it needs before it starts unlocking.
Thus, no unlock operation can precede a lock operation. This ensures that there are no deadlocks and that transactions are executed in a serializable manner. Overall, the 2PL protocol is an effective way to manage concurrency and ensure data consistency in database systems.
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