Distributed Systems: Locking and Concurrency Control
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Questions and Answers

What is the primary goal of timestamp-based concurrency control algorithms?

  • To increase the performance of concurrent transactions
  • To ensure that transactions commit in the order of their timestamps (correct)
  • To prevent deadlocks in a database system
  • To reduce the overhead of transaction management
  • What happens when two transactions, Ti and Tj, try to write the same data item simultaneously?

  • Both transactions rollback and restart
  • Tj's commit phase is delayed until Ti has committed (correct)
  • Ti's commit phase is delayed until Tj has committed
  • The younger transaction is aborted
  • What is the purpose of the access rule in timestamp-based ordering?

  • To ensure that older transactions commit before younger ones (correct)
  • To enforce two-phase locking protocol
  • To allow simultaneous access to data items
  • To prioritize younger transactions over older ones
  • What is the benefit of using timestamp-based concurrency control algorithms?

    <p>Ensured serializability and transaction isolation</p> Signup and view all the answers

    What is the role of timestamps in concurrency control?

    <p>To prioritize transactions based on their start time</p> Signup and view all the answers

    What is the effect of Rule 3 on transaction Ti and Tj?

    <p>Ti's commit phase cannot overlap with Tj's commit phase</p> Signup and view all the answers

    What is the consequence of violating the access rule in timestamp-based ordering?

    <p>The equivalent serial schedule is disrupted</p> Signup and view all the answers

    What is the primary difference between optimistic and pessimistic concurrency control?

    <p>Optimistic control assumes conflicts are rare, while pessimistic control assumes conflicts are common</p> Signup and view all the answers

    Which of the following is NOT a type of timestamp-based concurrency control algorithm?

    <p>Two-Phase Locking Protocol</p> Signup and view all the answers

    What is the primary advantage of using timestamp-based concurrency control algorithms?

    <p>Ensured serializability and transaction isolation</p> Signup and view all the answers

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