High Quality Content by WIKIPEDIA articles! In databases and transaction processing (transaction management), Two-phase locking, (2PL) is a concurrency control locking protocol, or mechanism, which guarantees serializability (e.g., see Bernstein et al. 1987, Weikum and Vossen 2001). It is also the name of the resulting class (set) of transaction schedules. Using locks that block processes, 2PL may be subject to deadlocks that result from the mutual blocking of two transactions or more.2PL is a super-class of Strong strict two-phase locking (SS2PL), also called Rigorousness, which is widely utilized for concurrency control in general-purpose database systems.Note that the two-phase locking protocol (2PL protocol) shouldn't be confused with the two-phase commit protocol (2PC protocol) for distributed transactions.

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