Since cache memory and RAM (Random Access Memory) are both transistor-based, why do we need cache memory when RAM (Random Access Memory) already serves as a transient memory? Is it possible to use only one type of computer memory for everything? When an optimistic approach to concurrency management is employed, transactions frequently require a considerable amount of time to conclude. Explain?

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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.