参考以下步骤：

SYS@oamp> create user rman_test identified by rman;

User created.

SYS@oamp> grant create session to rman_test;

Grant succeeded.

SYS@oamp> grant connect to rman_test ;

Grant succeeded.

SYS@oamp> grant RECOVERY_CATALOG_OWNER to rman_test;

Grant succeeded.

SYS@oamp> grant sysdba to rman_test;

Grant succeeded.

SYS@oamp> select * from V$PWFILE_USERS;

USERNAME                       SYSDB SYSOP SYSAS

------------------------------ ----- ----- -----

SYS                            TRUE  TRUE  FALSE

RMAN_TEST                      TRUE  FALSE FALSE

SYS@oamp> exit

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

/home/oracle>

oracle@SV18050 [oamp] > rman target rman_test@oamp

Recovery Manager: Release 11.2.0.3.0 - Production on Wed May 28 09:27:00 2014

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

target database Password:

connected to target database: OAMP (DBID=1348135612)