Consider the following use case and write four well-formed user stories. A mart wants to automate parts of its processes and provide online solutions for shopping, customer service, and electronic payments. The mart wants to maintain records of the clients and their purchases. The clients can make payments via B-Pay, Paypal, Mastercard, and Visa. If the client chooses Mastercard or Visa, additional fees of 2% will apply to cover operational costs. Payments must be confirmed before the purchase is effective for the system. The managers should be able to obtain daily, weekly, monthly, and annual sales reports. The customers should be able to receive an update on the progress of their purchase

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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.