312.Which is the correct way to connect to both the target database and the recovery catalog from the
RMAN command line? Assume that the target database is called ORCL and that the recovery catalog
database is called RCAT. Also assume that the recovery-catalog owner is called RCAT_OWN. Assume
the environment is configured for the ORCL database. (Choose all that apply.)
A. rman target=/ catalog=/@rcat
B. rman target=/ catalog=rcat_own/rcat_own
C. rman target=/ catalog=rcat_own/rcat_own@RCAT
D. rman target=sys/robert@orcl catalog=rcat_own/rcat_own@RCAT
E. You cannot connect to the target database and the recovery catalog at the same time.
Answer: CD
答案解析：
参考：http://blog.csdn.net/rlhua/article/details/13169205
从题中知道，现在的环境为ORCL即是目标数据库。
C,通过OS验证，不用跟密码来连接目标数据库以及目录数据库
D,通过远程密码验证来连接连接目标数据库以及目录数据库
以目录所有者的身份连接到恢复目录数据库:CONNECT CATALOG username/password@net_service_name