____ ensures that once transaction changes are done, they cannot be undone or lost, even in the event of a system failure.

Related MCQs

• Once the lower-level lock is released, the operation cannot be undone by using the old values of updated data items, and must instead be undone by executing a compensating operation; such an operation is called
• If an transaction is performed in a database and committed, the changes are taken to the previous state of transaction by
•          means that the data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
•                means that data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
• ____ means that the data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
• Which of the following stores several gigabytes of data but usually lost when power failure?
• A system is in a              state if there exists a set of transactions such that every transaction in the set is waiting for another transaction in the set.
• There are “record-once” versions of the compact disk and digital video disk, which can be written only once; such disks are also called                      disks.
• Which of the following trigger is executed once for each row in a transaction?
• The system has entered an undesirable state (for example, deadlock), as a result of which a transaction cannot continue with its normal execution. This is