Oracle HowTo:如何通过只读方式更改Oracle数据文件位置
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>