在Oracle数据库中,有多种方式可以移动数据文件的位置,之前介绍过几种方法:Oracle HowTo:在非归档模式下如何更改数据文件位置,Oracle HowTo:如何移动数据文件的位置?
以上两种方法,可能在要求较高的24x7系统中不适合采用,因为会使表空间长时间不可用。
非凡是当表空间数据文件巨大时,物理拷贝可能需要较长的时间。
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 tablespace tablespace_name read only;
2.物理拷贝文件
3.将表空间offline
alter tablespace tablespace_name offline;
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 tablespace tablespace_name online;
6.将表空间置于read write模式
alter tablespace tablespace_name read 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 modeArchive 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
right"(出处:清风软件下载学院)