The DBMS accomplishes ____ by reading the log for the problem transactions and applying the before images to undo their updates.
A) concurrent update
B) backward recovery
C) authentication
D) batch processing

Question

The DBMS accomplishes ____ by reading the log for the problem transactions and applying the before images to undo their updates.​
A) ​concurrent update
B) ​backward recovery
C) ​authentication
D) ​batch processing

Quizplus · Accepted Answer

Backward recovery, also known as rollback, is the process of undoing updates made by problem transactions. The DBMS achieves this by reading the log and applying the before images to reverse the updates.

The DBMS Accomplishes ____ by Reading the Log for the Problem