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You are managing a 24*7 database. The backup strategy for the database is to perform user-managed backups. Identify two prerequisites to perform the backups.（） 
A: The database must be opened in restricted mode.
B: The database must be configured to run in ARCHIVELOG mode.
C: The tablespaces are required to be in backup mode before taking the backup.
D: The tablespaces are required to be in read-only mode before taking the backup

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出自：Oracle认证

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