Schedules Schedule-a sequences of instructions that specify the chronological order in which instructions of concurrent transactions are executed A schedule for a set of transactions must consist of all instructions of those transactions Must preserve the order in which the instructions appear in each individual transaction. A transaction that successfully completes its execution will have a commit instructions as the last statement By default transaction assumed to execute commit instruction as its last step A transaction that fails to successfully complete its execution will have an abort instruction as the last statement Database System Concepts-6th Edition 14.11 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 6 14.11 ©Silberschatz, Korth and Sudarshan th Edition Schedules Schedule – a sequences of instructions that specify the chronological order in which instructions of concurrent transactions are executed A schedule for a set of transactions must consist of all instructions of those transactions Must preserve the order in which the instructions appear in each individual transaction. A transaction that successfully completes its execution will have a commit instructions as the last statement By default transaction assumed to execute commit instruction as its last step A transaction that fails to successfully complete its execution will have an abort instruction as the last statement