Uninstall mysql sever from Linux machine

1. Get the mysql installed rpm and its dependency.

[root@localhost ~]# rpm -qa | grep -i mysql
MySQL-devel-* 
MySQL-test-*
MySQL-server-*
MySQL-client-* 
MySQL-shared-*
MySQL-shared-compat-*
MySQL-embedded-*

2. Above query return some result as shown and then remove all rpms i.e. return by query

[root@localhost ~]# rpm -e MySQL-* 

OR [remove them one by one]

[root@localhost ~]# rpm -e MySQL-devel-* (full rpm name)
[root@localhost ~]# rpm -e MySQL-test-*
[root@localhost ~]# rpm -e MySQL-server-*
[root@localhost ~]# rpm -e MySQL-client-*
[root@localhost ~]# rpm -e MySQL-shared-*
[root@localhost ~]# rpm -e MySQL-shared-compat-*
[root@localhost ~]# rpm -e MySQL-embedded-* 

3. After uninstall rpm check for the directory existence at path /var/lib/mysql if exists remove directory.

[root@localhost ~]# cd /var/lib 
[root@localhost lib]# rmdir -p mysql