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      Question

      Which of the following concurrency control techniques

      allows multiple transactions to read data simultaneously but ensures that only one transaction can write to the data at a time?
      A Two-phase locking Correct Answer Incorrect Answer
      B Timestamp ordering Correct Answer Incorrect Answer
      C Optimistic concurrency control Correct Answer Incorrect Answer
      D Read-Write locking Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Read-Write locking allows multiple transactions to read data simultaneously but ensures that only one transaction can write to the data at a time.  

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