621.You have enabled backup optimization for the RMAN environment. Identify two criteria on which RMAN will skip the file, if it has already been backed up. (Choose two.)
A. The data file backup is done with multiple channels
B. The data files is in the read-write mode after being backed up in the read only mode
C. The backup was taken after the data files was taken offline-normal or is in the read only mode
D. The data file backup complies with the back retention policy and the backup duplexing feture
Answer: CD
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmbckad.htm#BRADV89548
题意是：RMAN的备份优化功能，如果文件已经备份，哪二个条件可以使RMAN备份时跳过该文件？
备份是在数据文件被正常脱机或是在只读模式下进行的； C
数据文件备份符合备份保留策略和双重备份特征； D
A. The data file backup is done with multiple channels
B. The data files is in the read-write mode after being backed up in the read only mode
C. The backup was taken after the data files was taken offline-normal or is in the read only mode
D. The data file backup complies with the back retention policy and the backup duplexing feture
Answer: CD
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmbckad.htm#BRADV89548
题意是：RMAN的备份优化功能，如果文件已经备份，哪二个条件可以使RMAN备份时跳过该文件？
备份是在数据文件被正常脱机或是在只读模式下进行的； C
数据文件备份符合备份保留策略和双重备份特征； D
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2120893/ ，如需转载，请注明出处，否则将追究法律责任。
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