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Consider the following scenario for your database: Which statement is true regarding the backup of the TOOLS tablespace?（）
A:The RMAN backup fails because the TOOLS tablespace is read-only
B:The RMAN skips the backup of the tablespace because backup optimization is enabled
C:The RMAN makes backup because optimization can be enabled only for backups to disk
D:The RMAN makes the backup because no backup of the tablespace exists within the seven day window

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出自：Oracle认证

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