一个朋友不小心将表空间建在了文件系统上，需要转移到裸设备上，懒的做实验了，参考了一下eygle的实验。大家可以去做一下这个实验：

1.使用裸设备建立jiagulun测试表空间
[oracle@jiagulun ~]$ sqlplus "/ as sysDBA"

SQL*Plus: Release 10.2.0.1.0 - Production on Wed Nov 30 14:41:53 2005

Copyright (c) 1982, 2005, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options

SQL> create tablespace jiagulun
  2  datafile '/dev/cciss/c0d0p11' size 10M;

Tablespace created.

SQL> create table jiagulun tablespace jiagulun as select * from dba_objects;

Table created.


SQL> select count(*) from jiagulun;

  COUNT(*)
----------
     50420

SQL> alter tablespace jiagulun offline;

Tablespace altered.

SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options

2.使用RMAN的COPY功能备份裸设备文件为文件系统文件
[oracle@jiagulun ~]$ rman target /

Recovery Manager: Release 10.2.0.1.0 - Production on Wed Nov 30 16:00:42 2005

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

connected to target database: jiagulun (DBID=3965153484)

RMAN> copy datafile '/dev/cciss/c0d0p11' to '/opt/oracle/jiagulun01.dbf';

Starting backup at 30-NOV-05
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=137 devtype=DISK
channel ORA_DISK_1: starting datafile copy
input datafile fno=00002 name=/dev/cciss/c0d0p11
output filename=/opt/oracle/jiagulun01.dbf tag=TAG20051130T160137 recid=2 stamp=575740898
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:02
Finished backup at 30-NOV-05

RMAN> exit


Recovery Manager complete.

3.通过rename修改文件位置
[oracle@jiagulun ~]$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Wed Nov 30 16:01:54 2005

Copyright (c) 1982, 2005, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options

SQL> alter database rename file '/dev/cciss/c0d0p11' to '/opt/oracle/jiagulun01.dbf';

Database altered.

SQL> alter tablespace jiagulun online;

Tablespace altered.

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

FILE_NAME
--------------------------------------------------------------------------------
/opt/oracle/jiagulun01.dbf

4.进行数据修改
SQL> insert into jiagulun as select * from jiagulun;
insert into jiagulun as select * from jiagulun
                  *
ERROR at line 1:
ORA-00926: missing VALUES keyword


SQL> insert into jiagulun select * from jiagulun;
insert into jiagulun select * from jiagulun
            *
ERROR at line 1:
ORA-01653: unable to extend table SYS.jiagulun by 128 in tablespace jiagulun

SQL> alter database datafile '/opt/oracle/jiagulun01.dbf' resize 20m;

Database altered.

SQL> insert into jiagulun select * from jiagulun;

50420 rows created.

SQL> commit;

Commit complete.

SQL> alter tablespace jiagulun offline;

Tablespace altered.

SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options

5.从文件系统迁移文件至裸设备
[oracle@jiagulun ~]$ rman target /

Recovery Manager: Release 10.2.0.1.0 - Production on Wed Nov 30 16:08:51 2005

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

connected to target database: jiagulun (DBID=3965153484)

RMAN> copy datafile '/opt/oracle/jiagulun01.dbf' to '/dev/cciss/c0d0p11';

Starting backup at 30-NOV-05
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=135 devtype=DISK
channel ORA_DISK_1: starting datafile copy
input datafile fno=00002 name=/opt/oracle/jiagulun01.dbf
output filename=/dev/cciss/c0d0p11 tag=TAG20051130T160935 recid=3 stamp=575741376
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 30-NOV-05

RMAN> exit


Recovery Manager complete.
[oracle@jiagulun ~]$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Wed Nov 30 16:09:48 2005

Copyright (c) 1982, 2005, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options

SQL> alter database rename file '/opt/oracle/jiagulun01.dbf' to '/dev/cciss/c0d0p11';

Database altered.

SQL> alter tablespace jiagulun online;

Tablespace altered.

SQL> select count(*) from jiagulun;

  COUNT(*)
----------
    100840

SQL>

rman使得对于裸设备的操作大大简化。

ramn 太好用了，看起来太简单了

nice job ~