--添加测试表空间
SQL> create tablespace xff datafile '/u01/oradata/xifenfei.dbf' size 10m autoextend on maxsize 100m;
Tablespace created.
--查看数据文件位置
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
+DATA/tasm/system01.dbf
+DATA/tasm/undotbs01.dbf
+DATA/tasm/sysaux01.dbf
+DATA/tasm/users01.dbf
+DATA/tasm/example01.dbf
/u01/oradata/xifenfei.dbf
6 rows selected.
--创建测试表
SQL> create table hr.a tablespace xff
  2  as
  3  select * from dba_tables;
Table created.
SQL> select count(*) from hr.a;
  COUNT(*)
----------
      1580
--转移数据文件位置
[oracle@localhost oradata]$ rman target /
Recovery Manager: Release 10.2.0.3.0 - Production on Mon Jun 27 04:30:22 2011
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
connected to target database: TASM (DBID=3032096031)
RMAN> sql 'alter tablespace xff offline';
using target database control file instead of recovery catalog
sql statement: alter tablespace xff offline
RMAN> backup as copy tablespace xff format '+DATA';
Starting backup at 27-JUN-11
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=132 devtype=DISK
channel ORA_DISK_1: starting datafile copy
input datafile fno=00006 name=/u01/oradata/xifenfei.dbf
output filename=+DATA/tasm/datafile/xff.269.754893121 tag=TAG20110627T043200 recid=2 stamp=754893123
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 27-JUN-11
RMAN> switch tablespace xff to copy;
datafile 6 switched to datafile copy "+DATA/tasm/datafile/xff.269.754893121"
RMAN> sql 'alter tablespace xff online';
sql statement: alter tablespace xff online
--查看转移后的数据文件位置
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
+DATA/tasm/system01.dbf
+DATA/tasm/undotbs01.dbf
+DATA/tasm/sysaux01.dbf
+DATA/tasm/users01.dbf
+DATA/tasm/example01.dbf
+DATA/tasm/datafile/xff.269.754893121
6 rows selected.
--测试其中数据是否存在
SQL> select count(*) from hr.a;
  COUNT(*)
----------
      1580
--创建asm中文件别名
ASMCMD> mkalias  +DATA/tasm/datafile/xff.269.754893121 +DATA/tasm/xff01.dbf
--文件重命名
SQL> alter tablespace xff offline;
Tablespace altered.
SQL> alter database rename file '+DATA/tasm/datafile/xff.269.754893121' to '+DATA/tasm/xff01.dbf';
Database altered.
SQL> alter tablespace xff online;
Tablespace altered.
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
+DATA/tasm/system01.dbf
+DATA/tasm/undotbs01.dbf
+DATA/tasm/sysaux01.dbf
+DATA/tasm/users01.dbf
+DATA/tasm/example01.dbf
+DATA/tasm/xff01.dbf
6 rows selected.
--手工删除原来数据
[oracle@localhost oradata]$ rm xifenfei.dbf 

说明：可以在rman移植数据文件位置的时候，同时处理好别名，然后对表空间重命名，实现只需要表空间离线一次