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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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