662.To enable faster incremental backups, you enabled block change tracking for the database. Which
two statements are true about the block change tracking file? (Choose two.)
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.
Answer: CD
答案解析：
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmbckba.htm#BRADV89534
Location of the Block Change Tracking File
One block change tracking file is created for the whole database. By default, the change tracking file is created as an Oracle
managed file in the destination specified by the DB_CREATE_FILE_DEST initialization
parameter. You can also place the change tracking file in any location that you choose, by specifying its name when enabling block change tracking. Oracle recommends against using a raw device (that is, a disk without a file system) as a change tracking file.
Note:
In an Oracle RAC environment, the change tracking file must be located on shared storage accessible from all nodes in the cluster.RMAN does not support backup and recovery of the change tracking file. The database resets the change tracking file when it determines that the change tracking file is invalid. If you restore and recover the whole database or a subset, then the database resets the block change tracking file and starts tracking changes again. After you make a level 0 incremental backup, the next incremental backup can use change tracking data.