The default method for running the deinstallation tool is from the deinstall directory in the Oracle home as the installation owner: Oracle recommends that you run the deinstallation tool as the Oracle software installation owner. If Grid Naming Service (GNS) is in use, then the entry for the subdomain needs to be deleted from DNS by your DNS administrator.
Oracle Automatic Storage Management Cluster File System (Oracle ACFS) must be dismounted and Oracle Automatic Storage Management Dynamic Volume Manager (Oracle ADVM) must be disabled. In addition, for Oracle Grid Infrastructure installations: If you have any user data in these locations in the Oracle base that is owned by the user account that owns the Oracle software, then the deinstallation tool deletes this data. Oracle strongly recommends that you configure your installations using an Optimal Flexible Architecture (OFA) configuration, and that you reserve Oracle base and Oracle home paths for exclusive use of Oracle software. When you run the deinstallation tool, if the central inventory contains no other registered homes besides the home that you are deconfiguring and removing, then the Deinstallation tool removes the following files and directory contents in the Oracle base directory of the Oracle Database installation owner: If the software in the Oracle home is not running (for example, after an unsuccessful installation), then the deinstallation tool cannot determine the configuration, and you must provide all the configuration details either interactively or in a response file. The deinstallation tool stops Oracle software, and removes Oracle software and configuration files on the operating system for a specific Oracle home. Alternatively, you can supply a response file generated previously by the deinstall command using the –checkonly option, or by editing the response file template.
The deinstall command uses the information you provide and the information gathered from the software home to create a response file. The Deinstallation Tool is also available as a separate command ( deinstall) in Oracle home directories after installation. You can run the deinstallation tool using the setup.exe command with the -deinstall and -home options from the base directory of the Oracle Database, Oracle Database Client, or Oracle Grid Infrastructure installation media. Starting with Oracle Database 12 c Release 1 (12.1), the deinstallation tool is integrated with Oracle Universal Installer (OUI).
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