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You are managing an Oracle Database 11g database. You configured the database to run inARCHIVELOG mode.  Which two statements are true in this scenario（）
A:You must shut down the database instance to perform the backups.
B:You must configure the Flash Recovery Area （FRA） for the database.
C:You can perform complete database backups without closing the database.
D:All the previous closed database backups including control files become invalid after you configure thedatabase to ARCHIVELOG mode.

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出自：Oracle认证

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