How Oracle is removed

Manually remove Oracle completely

First step: Disable all Oracle Services

Step Two: Delete the Oracle Registry
Run regedit to find the Oracle key value in the following path, delete
HKEY_LOCAL_MACHINE\Software
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
Hkey_local_machine\system\currentcontrolset\services\eventlog\application

The third step: Delete the physical files, there are the following two folders (there are DLLs and other files are used please skip the file)
1. X:\app\ ... This directory is the default Oracle installation home directory, and the connected app is all erased.
2, X:\Program files\oracle\ ... This directory is completely removed for inventory content, along with Oracle.

Fourth step: Delete the Oracle variable in the system variable path

Fifth step: Restart, and then delete the content that was not deleted in the third step