单选题You work as a database administrator for Certkiller .com. One of the user sessions was terminated abnormally in the middle of a transaction. What does Oracle database do to recover it？（）A Uses undo data for roll forwardB Uses Flashback Log for recovery
题目
单选题
You work as a database administrator for Certkiller .com. One of the user sessions was terminated abnormally in the middle of a transaction. What does Oracle database do to recover it？（）
A
Uses undo data for roll forward
B
Uses Flashback Log for recovery
C
Uses online redo logs to roll back
D
Uses undo data to roll back the transaction
E
Uses Recovery Manager （RMAN） to roll back
F
Uses the System Monitor （SMON） background process to perform instance recovery