In which procedure does the DBMS read the log for the problem transactions and apply the before images to undo their updates?
A) concurrent update
B) backward recovery
C) authentication
D) batch processing

Question

Quizplus · Accepted Answer

Backward recovery, also known as rollback or undo, is a procedure used by the DBMS to recover from a failure or an aborted transaction. In this procedure, the DBMS reads the log and applies the before images to undo the updates made by the problem transactions.

In Which Procedure Does the DBMS Read the Log for the Problem