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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

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出自：Oracle认证

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