Prepare a state diagram for an account. Consider the cases of: overdrawn, account with incorrect PIN, open ,close. - list the states for the account class - find out the events -from each event consider transition among the states -suspended state: the access to the account is blocked -overdrawn state: when customer withdrawals exceed the balance in the account -start from the normal state

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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.