Automatic Acquisition of Locks A transaction T issues the standard read/write instruction,without explicit locking calls. The operation read(D)is processed as: if T;has a lock on D then read(D) else begin if necessary wait until no other transaction has a lock-X on D grant T a lock-Son D; read(D) end Database System Concepts-7th Edition 18.14 @Silberschatz,Korth and SudarshanDatabase System Concepts - 7 18.14 ©Silberschatz, Korth and Sudarshan th Edition Automatic Acquisition of Locks ▪ A transaction Ti issues the standard read/write instruction, without explicit locking calls. ▪ The operation read(D) is processed as: if Ti has a lock on D then read(D) else begin if necessary wait until no other transaction has a lock-X on D grant Ti a lock-Son D; read(D) end