Perfect Uninstall Oracle Database _oracle

Recently because to write a project interface, the need to remotely connect the Oracle database, just at the beginning because I installed a local MySQL, so used to connect the local MySQL, the interface is generally finished in Tomcat test under, also can run through, but later to change the database, So you want to install a local Oracle test, this installation is an afternoon to take off a night ah, so to share this history of blood and tears. Students who have installed Oracle believe that they have uninstalled Oracle (this is a very bad thing to say, but it doesn't seem strange to anyone who really does it), basically every time you install Oracle, it becomes very important to uninstall Oracle at will. Because the uninstall is not clean will cause the next installation is still unsuccessful. Don't talk nonsense, go straight up the steps.

Right-click Computer –> Manage –> services and application –> services, and deactivate all Oracle-related services (beginning with Oracle, such as ORACLEDBCONSOLEORCL).

Start –> All Programs –>oracle–>oracle Install products –>universal Installer, after the "Welcome" interface starts, uninstall the product –> expand oradb11g_home1– under the Oracle home directory > Check Oracle Database 11g11.2.0.1.0–> Delete –> Select "Yes" in the pop-up confirmation window. When the uninstall is complete, select Close in the Product List interface that pops up, and then select Cancel in the Welcome interface to exit the interface.

Click Uninstall Product, or click on the installed product.

Remember to select the Oracle Database 11g folder, not the home, and then click Yes

Start –> Enter regedit in the Search field and enter the registry

(1) Select Hkey_local_machine\software\oracle, press del key to delete this entry
(2) Select HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services, scroll this list, delete all Oracle portals (keys that begin with Oracle)//This is all service in the service
(3) Select Hkey_local_machine\system\currentcontrolset\services\eventlog\application and remove all Oracle portals.
(4) Delete all keys in the HKEY_CLASSES_ROOT directory that are prefixed by Ora or Oracle.

Computer –> Properties –> advanced system Settings –> advanced –> environment variables, deleting environment variables classpath and the settings for Oracle in path.
(This is important, I installed the time is a successful installation, and then use the Plsql to configure an environment variable, and then continue to connect not, and then look at Oracle or install the wrong, and then forget to uninstall the configuration of the Oracle information of the PATH variable deleted, Then it causes a series of errors)

Delete all Oracle-related directories (if deleted, restart the computer and then delete it) includes:

1) C:\Program files\oracle directory.
2 Oracle installation directory, such as D:\app
3) C:\WINDOWS\system32\config\systemprofile\Oracle directory.
4) C:\ user \ Username \oracle

The last step, after unloading, you must restart the computer, or uninstall is not clean, the next time the installation of the same problem.
PS. When fully uninstalled, you can install it at ease.

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