Q. No.  Concurrency Control is a most important element for the proper functioning of a system where two or multiple database transactions that require access to the same data, are executed simultaneously. You have to discuss all issues of concurrent access of data with the help of self-assumed scenarios and data.  Note: this question is related from database subject kindly solved it correctly and completly.

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Transaction Processing

Transaction processing is a computational style generally performed by server computers, which supports interactive applications (apps). Transaction processing is also known as information processing, which divides the work into indivisible and individual operations called transactions. The transaction is a set of tasks; a single task is considered as the minimum processing unit that cannot be divided again.