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MCQ 21: Deadlock recovery is possible by using the scheme(s):

  1. Deadlock recovery
  2. Deadlock detection
  3. Deadlock elimination
  4. Both A and B

MCQ 22: For controlling preemption, each transaction can be assigned a unique:

  1. Order
  2. Identifier
  3. Locator
  4. Timestamp

MCQ 23: A protocol that permits a transaction to lock a new data item only if it has not yet unlocked any data item, is called:

  1. Two-phase unlocking protocol
  2. One-phase locking protocol
  3. Two-phase locking protocol
  4. One-phase unlocking protocol

MCQ 24: A time stamp-ordering scheme ensures:

  1. Serializability
  2. Cascading
  3. Atomicity
  4. Consistency

MCQ 25: The data item may be locked by:

  1. 2 modes
  2. 3 modes
  3. 4 modes
  4. 5 modes

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