如果可以关闭数据库，可以采用下述步骤。如果不能关闭数据库，只能采用新建redo log files的方式来实现修改该redo 的路径了。

一、shutdown the database

二、拷贝redo log 文件到新的位置

三、mount  database

四、重命名redo

五、open database

--1 .shutdown the databaseSQL> shutdown immediate;Database closed.Database dismounted.ORACLE instance shut down.SQL> exit

-- 2.拷贝redo log 文件到新的位置[oracle@oradb01 orcl]$ mv /opt/ora11g/oradata/orcl/redo01.log   /opt/ora11g/oradata/orcl/ctl/redo01.rdo[oracle@oradb01 orcl]$mv /opt/ora11g/oradata/orcl/redo02.log   /opt/ora11g/oradata/orcl/ctl/redo02.rdo[oracle@oradb01 orcl]$ mv /opt/ora11g/oradata/orcl/redo03.log   /opt/ora11g/oradata/orcl/ctl/redo03.rdo

[oracle@oradb01 orcl]$ cd ctl[oracle@oradb01 ctl]$ lsredo01.rdo  redo02.rdo  redo03.rdo[oracle@oradb01 ctl]$ lltotal 153792-rw-r----- 1 oracle dba 52429312 Nov 14 10:43 redo01.rdo-rw-r----- 1 oracle dba 52429312 Nov 14 10:43 redo02.rdo-rw-r----- 1 oracle dba 52429312 Nov 14 11:00 redo03.rdo

[oracle@oradb01 ctl]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.3.0 Production on Mon Nov 14 11:08:58 2011Copyright (c) 1982, 2011, Oracle.  All rights reserved.Connected to an idle instance.

--3 mount database

SQL> startup mountORACLE instance started.

Total System Global Area 3273641984 bytesFixed Size                  2232800 bytesVariable Size             721423904 bytesDatabase Buffers         2533359616 bytesRedo Buffers               16625664 bytesDatabase mounted.

--4  重命名redo log filesSQL> ALTER DATABASE RENAME FILE '/opt/ora11g/oradata/orcl/redo01.log' ,'/opt/ora11g/oradata/orcl/redo02.log','/opt/ora11g/oradata/orcl/redo03.log'  2  to '/opt/ora11g/oradata/orcl/ctl/redo01.rdo','/opt/ora11g/oradata/orcl/ctl/redo02.rdo','/opt/ora11g/oradata/orcl/ctl/redo03.rdo'  3  ;

Database altered.

-- 5. open  database

SQL> alter database open;

Database altered.