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To enable faster incremental backups， you enabled block change tracking for the database. Which two statements are true about the block change tracking file？（） 
A: Multiple change tracking files can be created for a database.
B: The change tracking file must be created after the first level 0 backup.
C: RMAN does not support backup and recovery of the change tracking file.
D: The database clears the change tracking file and starts tracking changes again，after whole database restore and recovery operations.

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出自：Oracle认证

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