不多说了，晚上加班在单节点的备库搭建物理DG，有点着急回宿舍，一时半会儿忘了把root put过去的控制文件没有修改权限，复制库的时候出错。如下：

[oracle@xxx:/opt/oracle]$ rman target / auxiliary sys/system@xxx

Recovery Manager: Release 9.2.0.4.0 - 64bit Production

Copyright (c) 1995, 2002, Oracle Corporation.  All rights reserved.

connected to target database: XXXXCDB (DBID=69648XXXX)
connected to auxiliary database: cakmcdb (not mounted)

RMAN> duplicate target database for standby nofilenamecheck;

Starting Duplicate Db at 20-MAY-13
using target database controlfile instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: sid=8 devtype=DISK

printing stored script: Memory Script
{
   restore clone standby controlfile to clone_cf;
   replicate clone controlfile from clone_cf;
   sql clone 'alter database mount standby database';
}
executing script: Memory Script

Starting restore at 20-MAY-13

using channel ORA_AUX_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 05/20/2013 21:57:12
RMAN-03015: error occurred in stored script Memory Script
ORA-19587: error occurred reading 8192 bytes at block number 1
ORA-27091: skgfqio: unable to queue I/O
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
Additional information: 1
Additional information: 1

此处需要修改给备库创建的控制文件的权限

# ls -l ctl_racdb_st.bak
-rw-r--r--   1 root     other    2023424  5月 20 22:00 ctl_racdb_st.bak
# chown oracle:dba ctl_racdb_st.bak
# ls -l ctl_racdb_st.bak
-rw-r--r--   1 oracle   dba      2023424  5月 20 22:00 ctl_racdb_st.bak

注意：
1、在9i中使用命令duplicate复制库，如果主备库的文件路径一样，则需要加参数nofilenamecheck，否则报错
2、在创建备库控制文件及备份主库的前后，需要执行 alter system archive log current; 产生新的检查点，否则在复制的时候可能会报备份的scn新于当前。