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Which of the following protocols does not ensure conflict serializability and safety from deadlocks?

  1. Graph based protocols
  2. Two-phase locking protocol
  3. Time-stamp ordering protocol
  4. Both a & b

1 Answer

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Graph based protocols and timestamp ordering protocols ensure both conflict serializability and free from deadlocks.

But 2-phase locking protocol ensures only conflict serializability but not free from deadlocks
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