November 12, 2005
Oracle HowTo:如何通过只读方式更改Oracle数据文件位置
作者:eygle
出处:http://blog.eygle.com
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。
特别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 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> |
Posted by eygle at 9:50 PM | Comments (4)
Oracle HowTo:如何移动数据文件的位置?
作者:eygle
出处:http://blog.eygle.com
在Oracle数据库中,有多种方式可以移动数据文件的位置,之前介绍过一种方法:Oracle HowTo:在非归档模式下如何更改数据文件位置其实可以采用的方法有多种,本文继续补充几种常用方法:
采用offline的方式
第一步,将表空间offline
alter tablespace tablespace_name offline;
第二步,cp文件到新的目录并rename修改控制文件
第三步,将相应表空间online
当然这种方式同样会影响期间的表空间使用。
以下是简单的示范步骤:
1.将表空间offline
[oracle@jumper oracle]$ sqlplus "/ as sysdba" SQL*Plus: Release 9.2.0.4.0 - Production on Sat Nov 12 18:14:21 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 No Archive Mode Automatic archival Enabled Archive destination /opt/oracle/oradata/conner/archive Oldest online log sequence 6 Current log sequence 9 SQL> select name from v$datafile; NAME --------------------------------------------------------- /opt/oracle/oradata/conner/system01.dbf /opt/oracle/oradata/conner/undotbs01.dbf /opt/oracle/oradata/conner/users01.dbf SQL> alter tablespace users offline; Tablespace altered. |
2.拷贝相应的数据文件
SQL> ! cp /opt/oracle/oradata/conner/users01.dbf /opt/oracle/oradata/users01.dbf
SQL> alter tablespace users rename datafile '/opt/oracle/oradata/conner/users01.dbf'
to '/opt/oracle/oradata/users01.dbf';
Tablespace altered.
|
3.将表空间online
SQL> alter tablespace users online; Tablespace altered. SQL> select name from v$datafile; NAME ------------------------------------------------------------------------ /opt/oracle/oradata/conner/system01.dbf /opt/oracle/oradata/conner/undotbs01.dbf /opt/oracle/oradata/users01.dbf |
当然还有一些其他的方法可以采用.
Posted by eygle at 9:09 PM | Comments (6)
