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多选题
Data files of which three tablespaces can be recovered by performing an openrecovery？（）
A
TEMP
B
UNDO
C
INDEX
D
SYSAUX
E
SYSTEM
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The data files can be recovered till the last committed transaction.B
The data files can be recovered without shutting down the database.C
The data file is taken offline automatically； the database remains open.D
The data files can be recovered to the time of the most recent backup.
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