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多項(xiàng)選擇題

ou are using the flash recovery area （fast recovery area in 11g Release 2） to store backup related files in your database. After regular monitoring of space usage in the Mash recovery area. You realize that the flash recovery area is （jetting filled up very fast and it is running out of space. 
Your database flash recovery area is low on specie and you have no more room on disk. Proactively， which two options could you use to make more space available in the flash recovery（）

A. Change the RMAN archived log deletion policy.
B. Use the RMAN CROSSCHECK command to reclaim the archived log space.
C. Change the RMAN retention policy to retain backups for a shorter period of time.
D. Use OS command to move files from the flash recovery area to some other location.

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