Suppose Garden Glory identifies three groups of users: managers, administrative personnel, and system administrators. Suppose further that the only job of administrativepersonnel is to make Service Update Transactions. Managers can make Service Update Transactions and Service Updates for New Employee Transactions. System administrators have unrestricted access to the tables. Describe processing rights that you thinkwould be appropriate for this situation. Use Figure 6-17 as an example. What problems might this security system have?

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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.