可参看“Red Hat5安装Oracle 11gR2”（http://www.2cto.com/database/201410/346710.html ）这篇文章。

1. 停止Oracle数据库

SQL> showdown immediate

2. 停止监听和EM

[oracle@localhost ~]$ lsnrctl stop
[oracle@localhost ~]$ emctl stop dbconsole

3. 停止http服务

[root@localhost ~]# service httpd stop

4. 删除安装目录

[root@localhost ~]# rm -rf /u01/app/oracle

5. 将/usr/local/bin下的文件删除

[root@localhost bin]# ls

[root@localhost bin]# rm -rf

6. 将/etc/oraInst.loc删除

[root@localhost etc]# rm oraInst.loc

7. 删除oracle用户和用户组

[root@localhost ~]# userdel -r oracle

[root@localhost ~]# groupdel oinstall

[root@localhost ~]# groupdel dba

?