（单选题）
The data file belonging to the SYSTEM tablespace is corrupted and no backup of the file is available. How do you recover the data file？（）
AThe data file cannot be recovered.
BThe date file can be restored from the SYSTEM auto backup.
CTake thetablespaceoffline，drop，kand re-create it.
DRecovery Manager （RMAN） is used to recover the data file.
EThe ALTER DATABSE CREATE DATAFILE..commandis used to recover the data file.
正确答案
答案解析
略
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