Process Synchronization Questions

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61.

Consider a transaction T1 that committed prior to checkpoint. The record appears in the log before the record. Any modifications made by T1 must have been written to the stable storage either with the checkpoint or prior to it. Thus at recovery time ____________

A

There is a need to perform an undo operation on T1

B

There is a need to perform a redo operation on T1

C

There is no need to perform an undo and redo operation on T1

D

All of the mentioned

Correct Answer: C

None.

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62.

Serializable schedules are ones where ____________

A

concurrent execution of transactions is equivalent to the transactions executed serially

B

the transactions can be carried out one after the other

C

a valid result occurs after execution transactions

D

none of the mentioned

Correct Answer: A

None.

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63.

A locking protocol is one that ____________

A

governs how locks are acquired

B

governs how locks are released

C

governs how locks are acquired and released

D

none of the mentioned

Correct Answer: C

None.

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64.

The two phase locking protocol consists of ____________

A

growing and shrinking phase

B

shrinking and creation phase

C

creation and growing phase

D

destruction and creation phase

Correct Answer: A

None.

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65.

The growing phase is a phase in which?

A

A transaction may obtain locks, but does not release any

B

A transaction may obtain locks, and releases a few or all of them

C

A transaction may release locks, but does not obtain any new locks

D

A transaction may release locks, and does obtain new locks

Correct Answer: A

None.

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66.

The shrinking phase is a phase in which?

A

A transaction may obtain locks, but does not release any

B

A transaction may obtain locks, and releases a few or all of them

C

A transaction may release locks, but does not obtain any new locks

D

A transaction may release locks, and does obtain new locks

Correct Answer: C

None.

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67.

Which of the following concurrency control protocols ensure both conflict serializability and freedom from deadlock? I) 2-phase locking II) Timestamp ordering

A

I only

B

II only

C

Both I and II

D

Neither I nor II

Correct Answer: B

None.

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68.

What is a reusable resource?

A

that can be used by one process at a time and is not depleted by that use

B

that can be used by more than one process at a time

C

that can be shared between various threads

D

none of the mentioned

Correct Answer: A

None.

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69.

Which of the following condition is required for a deadlock to be possible?

A

mutual exclusion

B

a process may hold allocated resources while awaiting assignment of other resources

C

no resource can be forcibly removed from a process holding it

D

all of the mentioned

Correct Answer: D

None.

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70.

A system is in the safe state if ____________

A

the system can allocate resources to each process in some order and still avoid a deadlock

B

there exist a safe sequence

C

all of the mentioned

D

none of the mentioned

Correct Answer: A

None.

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