1. Database Installation Guide
  2. Installing Oracle Database
  3. Preinstallation Considerations for Installing Oracle Database
  4. Installing on Systems That Already Have Oracle Components

Installing on Systems That Already Have Oracle Components

Perform the following steps when other components exist on your computer:

  1. Log on as a member of the Administrators group for the computer on which you want to install Oracle components.

    If you are installing on a Primary Domain Controller (PDC) or a Backup Domain Controller (BDC), log on as a member of the Domain Administrators group.

  2. Delete the ORACLE_HOME environment variable if it exists. See the Microsoft online help for more information about deleting environment variables.

    Note:

    The ORACLE_HOME environment variable is automatically set in the registry. Manually setting this variable prevents installation.

  3. Back up any databases you must upgrade.

See Also:

Oracle Real Application Clusters Installation Guide for Linux and UNIX