For the following schedules of three transactions, tell whether there are any conflicts between them. T1 R(A) W(A) C -------------------------------------------------- -------------------------------- T2 W(A) C -------------------------------------------------- -------------------------------- T3 R(A) C a) If yes, describe them and explain how you would solve these conflicts with 2-phase locking. b) Where should we move the T3 confirmation so that there is a RW conflict between T2 and T3?

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Concurrency Control

The simultaneous occurrence of two or more operations is called concurrence and the situation is called concurrency. In concurrency, the function of one operation can affect the function of the other and put data integrity at risk. Hence, management for the control of concurrency is required. The management or controlling system in the Database Management System (DBMS) that coordinates concurrent access is called the concurrency control system.