The Two-Phase Locking Protocol This is a protocol which ensures conflict-serializable schedules. Phase 1:Growing Phase transaction may obtain locks transaction may not release locks Phase 2:Shrinking Phase transaction may release locks transaction may not obtain locks The protocol assures serializability.It can be proved that the transactions can be serialized in the order of their lock points (i.e. the point where a transaction acquired its final lock). Database System Concepts-5th Edition,Oct 5,2006 16.8 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 5 16.8 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006 The Two-Phase Locking Protocol This is a protocol which ensures conflict-serializable schedules. Phase 1: Growing Phase transaction may obtain locks transaction may not release locks Phase 2: Shrinking Phase transaction may release locks transaction may not obtain locks The protocol assures serializability. It can be proved that the transactions can be serialized in the order of their lock points (i.e. the point where a transaction acquired its final lock)