如何通过RMAN进行裸设备和文件系统之间的数据文件迁移

做个范例简单介绍如何使用Rman进行数据文件的裸设备和文件系统转换。

1.使用裸设备建立EYGLE测试表空间

[oracle@danaly ~]$ 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 eygle
  2  datafile '/dev/cciss/c0d0p11' size 10M;

Tablespace created.

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

Table created.


SQL> select count(*) from eygle;

  COUNT(*)
----------
     50420

SQL> alter tablespace eygle 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@danaly ~]$ 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: DANALY (DBID=3965153484)

RMAN> copy datafile '/dev/cciss/c0d0p11' to '/opt/oracle/eygle01.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/eygle01.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@danaly ~]$ 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/eygle01.dbf'; 

Database altered.

SQL> alter tablespace eygle online;

Tablespace altered.

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

FILE_NAME
--------------------------------------------------------------------------------
/opt/oracle/eygle01.dbf

4.进行数据修改

SQL> insert into eygle as select * from eygle;
insert into eygle as select * from eygle
                  *
ERROR at line 1:
ORA-00926: missing VALUES keyword


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

SQL> alter database datafile '/opt/oracle/eygle01.dbf' resize 20m;

Database altered.

SQL> insert into eygle select * from eygle;

50420 rows created.

SQL> commit;

Commit complete.

SQL> alter tablespace eygle 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@danaly ~]$ 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: DANALY (DBID=3965153484)

RMAN> copy datafile '/opt/oracle/eygle01.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/eygle01.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@danaly ~]$ 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/eygle01.dbf' to '/dev/cciss/c0d0p11';

Database altered.

SQL> alter tablespace eygle online;

Tablespace altered.

SQL> select count(*) from eygle; 

  COUNT(*)
----------
    100840

SQL> 

rman使得对于裸设备的操作大大简化。