Process Synchronization Questions

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51.

What are the operations that can be invoked on a condition variable?

A

wait and signal

B

hold and wait

C

signal and hold

D

continue and signal

Correct Answer: A

None.

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52.

Which is the process of invoking the wait operation?

A

suspended until another process invokes the signal operation

B

waiting for another process to complete before it can itself call the signal operation

C

stopped until the next process in the queue finishes execution

D

none of the mentioned

Correct Answer: A

None.

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53.

If no process is suspended, the signal operation ____________

A

puts the system into a deadlock state

B

suspends some default process execution

C

nothing happens

D

the output is unpredictable

Correct Answer: C

None.

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54.

A collection of instructions that performs a single logical function is called ____________

A

transaction

B

operation

C

function

D

all of the mentioned

Correct Answer: A

None.

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55.

A terminated transaction that has completed its execution successfully is ____________ otherwise it is __________

A

committed, destroyed

B

aborted, destroyed

C

committed, aborted

D

none of the mentioned

Correct Answer: C

None.

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56.

The state of the data accessed by an aborted transaction must be restored to what it was just before the transaction started executing. This restoration is known as ________ of transaction.

A

safety

B

protection

C

roll-back

D

revert-back

Correct Answer: C

None.

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57.

Write ahead logging is a way ____________

A

to ensure atomicity

B

to keep data consistent

C

that records data on stable storage

D

all of the mentioned

Correct Answer: D

None.

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58.

In the write ahead logging a _____________ is maintained.

A

a memory

B

a system

C

a disk

D

a log record

Correct Answer: D

None.

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59.

An actual update is not allowed to a data item ____________

A

before the corresponding log record is written out to stable storage

B

after the corresponding log record is written out to stable storage

C

until the whole log record has been checked for inconsistencies

D

all of the mentioned

Correct Answer: A

None.

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60.

The system periodically performs checkpoints that consists of the following operation(s) ____________

A

Putting all the log records currently in main memory onto stable storage

B

putting all modified data residing in main memory onto stable storage

C

putting a log record onto stable storage

D

all of the mentioned

Correct Answer: D

None.

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