Which of these statements about deadlock are true? (list all that are true.) a. If all...

Which of these statements about deadlock are true? (list all that are true.)

a. If all transactions use two-phase locking, they cannot deadlock.
b. Once two transactions deadlock, one of them must be aborted to maintain correctness.
c. Systems that support update locks (S, X and U modes) cannot deadlock.
d. Validation based concurrency control schemes cannot deadlock.

Solutions

Expert Solution

ANSWERS -

The correct statements about deadlock are -

(b) To maintain correctness one of the two transaction must be terminated or aborted.

For maintaining accuracy one of the transaction must be terminated so that the other transaction can proceed with execution without deadlock.

(d) Deadlock doesn't occur in validation based concurrency control

Validation based concurrency control ensures that two transaction does not conflict ensuring the execution thus avoiding deadlock.

Two phase locking ensures serializability but doesn't avoid the deadlock situation. So, this statement is false.

Update lock supported system can also get into deadlock. So, this statement is also false.

So, the correct options related to deadlock are (b) and (d).

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venereology answered 1 month ago

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