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Which three statements are true about database recovery operations？（）
A:Damaged or lost data files are restored from backups.
B:Redo log file entries are used to roll forward the database.
C:Undo segments are used to roll back any uncommitted transactions.
D:Transactions that were active when the failure occurred are restarted.
E:Transactions that were active when the failure occurred are automatically committed during the recover procedure.

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出自：Oracle认证

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