RAC环境创建本地数据文件的解决方法：
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思路如下：
1.数据文件 offline
2.通过RMAN 将数据文件拷贝到存储
3.alter database rename file 将本地文件路径修改为存储路径
4.数据文件 online
操作如下：
SQL> select file_name,file_id,ONLINE_STATUS from dba_data_files; --查询数据文件信息为27
SQL> alter database datafile 27 offline; --数据文件脱机
RMAN> copy datafile 27 to '+DATADG'; --rman复制文件
Starting backup at 18-JUN-14
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=6446 instance=orcl1 device type=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: SID=6672 instance=orcl1 device type=DISK
allocated channel: ORA_DISK_3
channel ORA_DISK_3: SID=6783 instance=orcl1 device type=DISK
allocated channel: ORA_DISK_4
channel ORA_DISK_4: SID=7125 instance=orcl1 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00027 name=/app/oracle/product/11.2.0/dbhome_1/dbs/11111.ora
output file name=+DATADG/orcl/datafile/mcc.291.850576959 tag=TAG20140618T152238 RECID=1 STAMP=850577020
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:05
Finished backup at 18-JUN-14
SQL> alter database rename file '/app/oracle/product/11.2.0/dbhome_1/dbs/11111.ora' to '+DATADG/orcl/datafile/mcc.291.850576959'; --重命名文件
RMAN> switch datafile 27 to copy; --rman更新控制文件
SQL> recover datafile 27; --recover数据文件
SQL> alter database datafile 27 online; --数据文件联机
SQL> select file_name,file_id,ONLINE_STATUS from dba_data_files; --查询状态
SQL>select file_name,file_id,ONLINE_STATUS from dba_data_files;
参考：http://blog.itpub.net/501889/viewspace-1083311/
