Windows In the environment , Clean up completely mysql：

1. Uninstall the control panel program first ;

2. Delete the installation directory

3. Clean up the registry （ Use this step after the above two steps have not been cleaned up ）：（ notice mysql Just delete the folder or related ）（ Remember to restart after cleaning ）

win+r function ：regedit

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\MySQL
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\Eventlog\Application\MySQL
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application\MySQL

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl001\Services\MYSQL
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl002\Services\MYSQL
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MYSQL

4. Check if there is any in the service mysql service , It means it has been cleaned ：