RMAN> duplicate target database to clonedb from active database;
Starting Duplicate Db at 28-JAN-16
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 01/28/2016 19:56:12
RMAN-06217: not connected to auxiliary database with a net service name
RMAN> quit
解决办法：
登录方式不对，为rman target sys/MANAGER@orcl auxiliary sys/MANAGER@clonedb 即可
