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    Question

    Multiversion Concurrency Control (MVCC)

    ensures:
    A Only one version of data exists at a time Correct Answer Incorrect Answer
    B Read operations use snapshots of data without blocking writes Correct Answer Incorrect Answer
    C Updates are strictly serialized Correct Answer Incorrect Answer
    D Locks are mandatory for reads Correct Answer Incorrect Answer
    E Data is overwritten immediately Correct Answer Incorrect Answer

    Solution

    MVCC gives each transaction a consistent snapshot. Writers don’t block readers and vice versa.

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