Which two operations require undo data? (Choose two.)
A.
recovering from failed transactions
B.
recording a transaction to redo log files
C.
rolling back a transaction
D.
committing a transaction
E.
rolling forward during instance recovery
Which two operations require undo data? (Choose two.)
Which two operations require undo data? (Choose two.)
A.
recovering from failed transactions
B.
recording a transaction to redo log files
C.
rolling back a transaction
D.
committing a transaction
E.
rolling forward during instance recovery