[oracle@ENMOEDU dbs]$ ls #恢复的参数文件在$ORACLE_HOME/dbs 下
hc_ENMOEDU2.dat lkDUMMY orapwENMOEDU spfileENMOEDU2.ora
RMAN> shutdown immediate #关伪实例
Oracle instance shut down
2.然后再起真正的实例，恢复控制文件（要注意，他原来就有,你这样起，把B机的所有文件包括 数据文件 ，控制文件，参数文件，日志文件都删掉）
SQL> startup
ORACLE instance started.
Total System Global Area 422670336 bytes
Fixed Size 1345380 bytes
Variable Size 260049052 bytes
Database Buffers 155189248 bytes
Redo Buffers 6086656 bytes
ORA-00205: error in identifying control file, check alert log for more info
RMAN> restore controlfile from '/u01/app/oracle/ENMOEDU/backupset/2014_08_14/o1_mf_ncsnf_TAG20140814T203309_9ysc8x14_.bkp';
Starting restore at 15-AUG-14
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=18 device type=DISK
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=/u01/app/oracle/oradata/ENMOEDU/control01.ctl
output file name=/u01/app/oracle/fast_recovery_area/ENMOEDU/control02.ctl
Finished restore at 15-AUG-14
3.把数据库开到mount状态，以便修复数据文件。
RMAN> alter database mount;
database mounted
released channel: ORA_DISK_1
RMAN> restore database; #恢复数据文件 发现报错，很可能是备份已经过期已经，
Starting restore at 15-AUG-14
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=1 device type=DISK
creating datafile file number=1 name=/u01/app/oracle/oradata/ENMOEDU/system01.dbf
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 08/15/2014 23:21:00
ORA-01180: can not create datafile 1
ORA-01110: data file 1: '/u01/app/oracle/oradata/ENMOEDU/system01.dbf'
RMAN> list backup； #查看备份信息 发现确实过期
10 13.85M DISK 00:00:02 14-AUG-14
BP Key: 14 Status: EXPIRED Compressed: NO Tag: TAG20140814T203306
Piece Name: /u01/app/oracle/arch_50pfv1g2_1_1.rmn
然后再去A机 再来一个整体备份 再传给B机 不在赘述，再恢复控制文件，然后再恢复数据文件，
再启动到open即可。