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