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    Question

    MVCC (Multi-Version Concurrency Control)

    ensures:
    A Only one version of data exists Correct Answer Incorrect Answer
    B Readers never block writers and writers never block readers Correct Answer Incorrect Answer
    C Deadlocks never occur Correct Answer Incorrect Answer
    D No need for logging Correct Answer Incorrect Answer
    E Recovery is not required Correct Answer Incorrect Answer

    Solution

    MVCC provides snapshot isolation by keeping multiple row versions.

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