Uninstalling Mysql and Oracle

Uninstalling Mysql and Oracle if you have installed MySQL on your computer, if you want to reinstall MySQL again, an error may occur due to incomplete unloading of the previous version. The most common problem is that when you set the parameter verification in the last step after installation, an error occurs in the third Start Service in the Execute cmdattion step. the error prompt is "cocould not start the service MySQL" or "apply security setting" in the fourth step. The following describes how to thoroughly uninstall Mysql: First, stop the MySQL service in the Service (Start> Control Panel> Management Tools> service. Open Control Panel-add and delete programs, find MySQL, and uninstall. You can also uninstall it with 360 security guard. The installed MYSQL is uninstalled, but this is only half of the uninstalled MySQL. The other half is to clear the registry. We want to enter the registry, enter regedt in start-run, open the registry, click Edit in the registration table (Ctrl + F), and search for it below the table: HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Eventlog/Application/MySQLHKEY_LOCAL_MACHINE/SYSTEM/ControlSet002/Services/Eventlog/Application/MySQLHKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Eventlog/Application/M ySQL delete all MYSQL items, you need to delete all items by searching for one item, so that they can be installed. In fact, the MySQL items in the Registry are the three items: in this way, after the above three items are deleted, MySQL is basically uninstalled completely. If you are not at ease, you can search for mysql on drive C and delete all related items. In addition, Oracle should also be uninstalled under the Registry, otherwise it is difficult to fully uninstall, because the Oracle Installation File cannot be found under the control panel. Then, delete the related installation files and restart them to reinstall them.