忘记从哪里看到了，貌似这是11g的新特性

[oracle@rhel63single ~]$ rman target /

Recovery Manager: Release 11.2.0.4.0 - Production on Thu Feb 19 00:39:14 2015

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

connected to target database (not started)

RMAN> startup

Oracle instance started
database mounted
database opened

Total System Global Area    1068937216 bytes

Fixed Size                     2260088 bytes
Variable Size                612369288 bytes
Database Buffers             448790528 bytes
Redo Buffers                   5517312 bytes

RMAN> 

?

[root@rhel63single ~]# ps -ef | grep rman
oracle    2195  2171  0 00:39 pts/0    00:00:01 rman target /
root      2378  2358  0 00:42 pts/2    00:00:00 grep rman

[root@rhel63single ~]# ps -ef | grep sql
root      2380  2358  0 00:43 pts/2    00:00:00 grep sql

不过从alert日志中，看不到是从rman还是从sqlplus启动的db.