All transactions have four properties: Atomicity, Consistency, Isolation, and Durability. These four properties are also known as the ACID test of transactions. In addition, multiple transactions must conform to the property of serializability. Concurrency controlling techniques ensure that multiple transactions are executed simultaneously while maintaining the ACID properties of the transactions and serializability in the schedules. Explain the following statement: a transaction is a logical unit of work. What are some disadvantages of time-stamping methods for concurrency control? Why might it take a long time to complete transactions when an optimistic approach to concurrency control is used?

Q: Determine the top three problems that arise from processing transactions simultaneously. Exhibit how…

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Q: When an optimistic approach to concurrency control is applied, it is common for transactions to take…

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Q: Transactions are often held up when an optimistic concurrency control method is used. 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.