95.Examine the following scenario: The target database instance is running. The most recent backup available for the target database was taken two days ago. Log files switches have occurred in last two days. The target database is duplicated on the same host, using the Recovery Manager (RMAN) duplicate command as follows:
RMAN> RUN { ALLOCATE AUXILIARY CHANNEL aux 1 DEVICE TYPE DISK;
DUPLICATE TARGET DATABASE TO auxdb; }
Which statement is true about the duplicate database in this scenario?
A. It contains data till the last backup
B. It contains all data from target database until the current time
C. It contains all data from only the committed transactions in the target database
D. It contains all data except that which is used by the transactions in the current online redo file of target database
Answer: D
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmdupdb.htm#BRADV423
RMAN> RUN { ALLOCATE AUXILIARY CHANNEL aux 1 DEVICE TYPE DISK;
DUPLICATE TARGET DATABASE TO auxdb; }
Which statement is true about the duplicate database in this scenario?
A. It contains data till the last backup
B. It contains all data from target database until the current time
C. It contains all data from only the committed transactions in the target database
D. It contains all data except that which is used by the transactions in the current online redo file of target database
Answer: D
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmdupdb.htm#BRADV423
对于基于备份的数据库复制，主要工作是通过辅助信道进行。这些通道对应于目标主机上的辅助实例的服务器会话。
对于主动数据库复制，主要工作是通过目标信道进行的。
RMAN必须执行数据库的时间点恢复，即使在没有显式提供时间点复制。需要时间恢复的时间点，因为源数据库中的联机重做日志文件没有备份，不能应用到复制的数据库中。复制数据库恢复的最远点是由源数据库存档的最近的重做日志文件。
从命令来看，是进行基于备份的数据库复制。故选D。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2120465/ ，如需转载，请注明出处，否则将追究法律责任。
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