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Your Supportcenter.cn database is in ARCHIVELOG mode. The data file that belongs to the SYSTEM tablespace has become corrupted. Up to what point can you recover the database？（）
A:Until last commit
B:Until the time you perform recovery
C:Until the time the date file got corrupted
D:Until the point where the last transaction begun
E:You cannot recover the SYSTEMtablespaceand must re-create the database.

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出自：Oracle认证

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