ORACLE使用ASM存储，建库时默认只有一个控制文件，如果想多加几个控制文件，需要通过手工来添加，以下是我测试文档，贴出来分享下。[@more@]1.查看当前数据库的控制文件
SQL> select name from v$controlfile;

NAME
------------------------------------------------
+DATA01/orcl/controlfile/current.274.743672963

2.修改spfile中的控制文件参数
SQL> alter system set control_files='+DATA01/orcl/controlfile/current.274.743672963','+DATA01','+DATA01' scope=spfile sid='*';

System altered.

3.将数据库实例启动到nomount状态
SQL> shutdown immediate

[oracle@node1 ~]$ rman target /

Recovery Manager: Release 10.2.0.1.0 - Production on Wed Jul 20 11:27:44 2011

Copyright (c) 1982, 2005, Oracle. All rights reserved.

connected to target database (not started)

RMAN> startup nomount

Oracle instance started

Total System Global Area 167772160 bytes

Fixed Size 1218316 bytes
Variable Size 88082676 bytes
Database Buffers 75497472 bytes
Redo Buffers 2973696 bytes

RMAN> restore controlfile from '+DATA01/orcl/controlfile/current.274.743672963';

Starting restore at 20-JUL-11
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=147 instance=orcl1 devtype=DISK

channel ORA_DISK_1: copied control file copy
output filename=+DATA01/orcl/controlfile/current.274.743672963
output filename=+DATA01/orcl/controlfile/backup.285.756991697
output filename=+DATA01/orcl/controlfile/backup.286.756991699
Finished restore at 20-JUL-11


4.打开数据库
RMAN> sql 'alter database mount';

sql statement: alter database mount
released channel: ORA_DISK_1

RMAN> sql 'alter database open';

sql statement: alter database open

5.验证控制文件是否添加成功
SQL> select name from v$controlfile;

NAME
--------------------------------------------------------------------------------
+DATA01/orcl/controlfile/current.274.743672963
+DATA01/orcl/controlfile/backup.285.756991697
+DATA01/orcl/controlfile/backup.286.756991699;

6.修改spfile中的新添加的控制文件参数
SQL> alter system set

control_files='+DATA01/orcl/controlfile/current.274.743672963','+DATA01/orcl/controlfile/backup.285.756991697','+DATA01/orcl/controlfile/backup.286.756991699'

scope=spfile sid='*';
System altered.

7.使用新的spfile启动数据库

SQL> shutdown immediate

SQL> startup

参考文档：metalink 文档：How to duplicate a controlfile when ASM is involved [ID 345180.1]