通过恢复影像副本，简单地修改数据文件名并把数据库恢复回来，
操作起来简单，比cp方式更省事。

----使用 SET NEWNAME 切换文件：

---创建测试表空间，数据文件放在/home/oracle/oradata/目录下：
--创建测试表空间：

SQL> create tablespace ts_xxf datafile '/home/oracle/oradata/ts_xxf_01.dbf' size 10m;

Tablespace created.

--查看表空间：

SQL> select file_name from dba_data_files where tablespace_name='TS_XXF';

FILE_NAME

--------------------------------------------------------------------------

/home/oracle/oradata/ts_xxf_01.dbf

---通过RMAN切换数据文件路径：

[oracle@enmo ~]$ rman target /

Recovery Manager: Release 11.2.0.4.0 - Production on Mon Nov 7 10:56:01 2016

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

connected to target database: PROD (DBID=338469376)

RMAN> run

2> {ALLOCATE CHANNEL c1 DEVICE TYPE DISK;

3> SQL "ALTER TABLESPACE ts_xxf OFFLINE IMMEDIATE";

4> SET NEWNAME FOR DATAFILE '/home/oracle/oradata/ts_xxf_01.dbf'

5>  TO '/u01/app/oracle/oradata/PROD/ts_xxf_01.dbf';

6> RESTORE TABLESPACE ts_xxf;

7> SWITCH DATAFILE ALL;

8> RECOVER TABLESPACE ts_xxf;

9> SQL "ALTER TABLESPACE ts_xxf ONLINE";

10> }

 #rman执行语句块。

using target database control file instead of recovery catalog

allocated channel: c1

channel c1: SID=57 device type=DISK

sql statement: ALTER TABLESPACE ts_xxf OFFLINE IMMEDIATE

executing command: SET NEWNAME

Starting restore at 07-NOV-16

creating datafile file number=6 name=/u01/app/oracle/oradata/PROD/ts_xxf_01.dbf

restore not done; all files read only, offline, or already restored

Finished restore at 07-NOV-16

datafile 6 switched to datafile copy

input datafile copy RECID=3 STAMP=927284407 file name=/u01/app/oracle/oradata/PROD/ts_xxf_01.dbf

Starting recover at 07-NOV-16

starting media recovery

media recovery complete, elapsed time: 00:00:01

Finished recover at 07-NOV-16

sql statement: ALTER TABLESPACE ts_xxf ONLINE

released channel: c1

RMAN>

#完成。

---再次查看TS_XXf表空间数据文件的位置：

SQL> select file_name from dba_data_files where tablespace_name='TS_XXF';

FILE_NAME

--------------------------------------------------------------------------

/u01/app/oracle/oradata/PROD/ts_xxf_01.dbf

---切换完毕后，删除原来的数据文件：

SQL> !ls /home/oracle/oradata/ts_xxf_01.dbf

/home/oracle/oradata/ts_xxf_01.dbf

SQL> !rm /home/oracle/oradata/ts_xxf_01.dbf

[oracle@enmo ~]$ ls

dirhome  homedir  mydoc  mydoc.zip  oradata

[oracle@enmo ~]$ cd oradata/

[oracle@enmo oradata]$ ls

[oracle@enmo oradata]$

#已经成功删除旧的数据文件。