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The data file belonging to theSYSTEMtablespaceis corrupted and no backup of the file is available. How do you recover the data file？（）
A:The data file cannot be recovered.
B:The date file can be restored from theSYSTEMauto backup.
C:Take thetablespaceoffline，drop，kand re-create it.
D:Recovery Manager （RMAN） is used to recover the data file.
E:The ALTER DATABSE CREATE DATAFILE..commandis used to recover the data file.

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出自：Oracle认证

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