In two-phase locking protocol.
A)All unlocking operations precede the first lock operation.
B)All locking operations precede the first unlock operation.
C)Locking and unlocking takes place simultaneously.
D)None of the above.

Question

Quizplus · Accepted Answer

In the two-phase locking protocol, all locking operations occur before any unlock operation. This ensures serializability in transaction schedules by preventing any transaction from acquiring new locks once it releases any lock, thus dividing the transaction into two distinct phases: a growing phase where locks are acquired and a shrinking phase where locks are released.

In Two-Phase Locking Protocol