What do you understand by the term "Concurrency" in any transaction system? Explain the issues involved in identification of concurrency in any system. Briefly discuss the concept of Aggregation concurrency in a state diagram. ?
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When multiple transactions execute concurrently in an uncontrolled or unrestricted manner, then it might lead to several problems. These problems are commonly referred to as concurrency problems in database environment. The five concurrency problems that can occur in database are:
(i). Temporary Update Problem
(ii). Incorrect Summary Problem
(iii). Lost Update Problem
(iv). Unrepeatable Read Problem
(v). Phantom Read Problem
Explanation:
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