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

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

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

In the write ahead logging a _____________ is maintained.

A. A memory
B. A system
C. A disk
D. A log record

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

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

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

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

A. Transaction
B. Operation
C. Function
D. All of the mentioned

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

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