Learn about the authentication of Oracle Database users with Windows operating systems.

• Overview of Windows Native Authentication
  Oracle Database can use Windows user login credentials to authenticate database users.
• About Windows Authentication Protocols
  The Windows native authentication adapter works with Windows authentication protocols to enable access to Oracle Database.
• About User Authentication and Role Authorization Methods
  Describes how user login credentials are authenticated and database roles are authorized in Windows domains.
• Overview of Operating System Authentication Enabled at Installation
  When you install Oracle Database, a special Windows local group called ORA_DBA is created (if it does not already exist from an earlier Oracle Database installation) and the Oracle Installation User is automatically added to it.