For the task graphs given in Figure 3.42, determine the following: 1. Maximum degree of concurrency. 2. Critical path length. Maximum achievable speedup over one process assuming that an arbitrarily large number of processes is available. 3. 4. The minimum number of processes needed to obtain the maximum possible speedup. The maximum achievable speedup if the number of processes is limited to (a) 2, (b) 4, and (c) 8.

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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.