Operating system mcqs atomic transactions

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Operating system mcqs atomic transactions

Question 6 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The undo and redo operations must be ..... to guarantee correct behaviour, even if a failure occurs during recovery process.
A
idempotent
B
easy
C
protected
D
all of the mentioned
Question 6 Explanation: 
Idempotent - Multiple executions of an operation have the same result as does one execution.
Question 7 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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
Question 8 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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
Question 9 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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
Question 10 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In the write ahead logging a ..... is maintained.
A
a memory
B
a system
C
a disk
D
a log record
There are 10 questions to complete.