Question: Question 5 a . Explain what is meant by a transaction and why it is an important unit of operation in a DBMS ? b

Question 5 a. Explain what is meant by a transaction and why it is an important unit of operation in a DBMS? b. Discuss how the log file is a fundamental feature in any database recovery mechanism. c. Describe, with an example, any type of problem that can occur in a multi-user environment when concurrent access to the database is allowed.

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