If                        are not obtained in undo operation it will cause problem in undo- phase.

Related MCQs

• For correct behaviour during recovery, undo and redo operation must be
• 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
• In order to undo the work of transaction after last commit which one should be used?
•              will undo all statements up to commit?
•                        determines which transactions to undo, which pages were dirty at the time of the crash, and the LSN from which the redo pass should start.
• Which of the following is used for undo operations alone?
• Which TCL command undo all the updates performed by the SQL in the transaction?
• The operation which is not considered a basic operation of relational algebra is
• Which lock should be obtained to prevent a concurrent transaction from executing a conflicting read, insert or delete operation on the same key value.
• Which s essential a business problem not a data problem: