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You have a read/x7fonly tablespace on read/x7fonly media. You want to perform a media recovery on the existing data files， but using a backup control file. The backup control file indicates that the status of the read/x7fonly tablespace was read/write when the control file was backed up. What should you consider？（）
A:drop the read­only tablespace and re­create the tablespace after recovery
B:take data files from the read­only tablespace offline before performing a recovery
C:perform a recovery; status of the tablespace in control file will be changed automatically
D:recovery using backup control file is not possible， so restore all the files from the last full database backup， and then open the database

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出自：Oracle认证

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