本文介绍如何在ASM实例的环境下，去复制2个控制文件的过程。
如果在文件系统，相对比较简单了。
##Make sure db is in the archived mode
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination +ARCH_01/t/
Oldest online log sequence 24
Next log sequence to archive 25
Current log sequence 25
##Make sure all of online redo is done backup
alter system switch logfile;
...
## If you are using spfile parameter file ,please convert it to pfile first
create pfile='/u01/app/oracle/initt.ora' from spfile='+ARCH_01/t/spfilet.ora';
## Backup controlfile in mount stage
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 1191182336 bytes
Fixed Size 2072288 bytes
Variable Size 318767392 bytes
Database Buffers 855638016 bytes
Redo Buffers 14704640 bytes
Database mounted.
alter database backup controlfile to '/u01/app/oracle/test_ctl.ctl';
##Edit the parameter: controlfile in the pfile
SQL> show parameter control
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_file_record_keep_time integer 7
control_files string +DATA_01/t/controlfile/current
.285.640542545, +DATA_01/t/con
trolfile/current.286.640542545
## Duplicate controlfile from file system to ASM instance
SQL> startup nomount pfile=/u01/app/oracle/initt1.ora
ORACLE instance started.
Total System Global Area 1191182336 bytes
Fixed Size 2072288 bytes
Variable Size 318767392 bytes
Database Buffers 855638016 bytes
Redo Buffers 14704640 bytes
$ ./rman target /
Recovery Manager: Release 10.2.0.3.0 - Production on Fri Dec 7 11:54:15 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: t (not mounted)
RMAN> restore controlfile from '/u01/app/oracle/test_ctl.ctl';
Starting restore at 12/07/2007 11:54:33
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=153 devtype=DISK
channel ORA_DISK_1: copied control file copy
output filename=+DATA_01/t/controlfile/test_ctl01
output filename=+DATA_01/t/controlfile/test_ctl02
Finished restore at 12/07/2007 11:54:41
SQL> startup nomount pfile=/u01/app/oracle/initt1.ora
alter database open resetlogs;