多选题Which three statements are true about database recovery operations？（）ADamaged or lost data files are restored from backups.BRedo log file entries are used to roll forward the database.CUndo segments are used to roll back any uncommitted transactions.DTransactions that were active when the failure occurred are restarted.ETransactions that were active when the failure occurred are automatically committed during the recover procedure.
多选题
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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