如何通过只读方式更改Oracle数据文件位置

本文推荐另外一种方法，可以做一个折中,以下是一个简单的步骤说明:
1.将表空间置于只读
只读状态可以使数据仍然可为用户访问.
alter tablespacetablespace_nameread only;
2.物理拷贝文件
3.将表空间offline
alter tablespacetablespace_nameoffline;
4.rename数据文件
alter database rename file'old_dir_file'to'new_dir_file';
5.将表空间联机
alter tablespacetablespace_nameonline;
6.将表空间置于read write模式
alter tablespacetablespace_nameread write;
以下是示范步骤:

1.将表空间置于只读状态

[oracle@jumper oracle]$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Sat Nov 12 21:10:49 2005

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /opt/oracle/oradata/conner/archive
Oldest online log sequence     7
Next log sequence to archive   10
Current log sequence           10
SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------
/opt/oracle/oradata/conner/system01.dbf
/opt/oracle/oradata/conner/undotbs01.dbf
/opt/oracle/oradata/conner/users01.dbf

SQL> alter tablespace users read only;

Tablespace altered.

2.物理拷贝文件

SQL> ! cp /opt/oracle/oradata/conner/users01.dbf /opt/oracle/oradata/users01.dbf

3.将表空间脱机

SQL> alter tablespace users offline;

Tablespace altered.

4.修改文件名称

SQL> alter database rename file '/opt/oracle/oradata/conner/users01.dbf' to '/opt/oracle/oradata/users01.dbf';

Database altered.

5.将表空间联机

SQL> alter tablespace users online;

Tablespace altered.

6.将表空间置于读写状态

SQL> alter tablespace users read write;

Tablespace altered.

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------
/opt/oracle/oradata/conner/system01.dbf
/opt/oracle/oradata/conner/undotbs01.dbf
/opt/oracle/oradata/users01.dbf

SQL>