使用oracle自带的runInstaller 卸载；
[root@localhost deinstall]# pwd
/usr/local/oracle/product/11.2.0/db_1/deinstall
[root@localhost deinstall]# ls
deinstall deinstall.xml jlib response sshUserSetup.sh
[root@localhost deinstall]# ./deinstall
You must not be logged in as root to run ./deinstall.
Log in as Oracle user and rerun ./deinstall.
提示必须以oracle用户执行
[root@localhost deinstall]# su - oracle
Last login: Thu Sep 27 07:04:36 EDT 2018 on pts/0
-bash-4.2$ cd /usr/local/oracle/product/11.2.0/db_1/deinstall/
-bash-4.2$ ./deinstall
