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1. Overview 1) OS_AUTHENT_PREFIX is an important initialization parameter to configure Oracle External User environment.
2) External User is a kind of Oracle External Authentication solution.
3) With Oracle External User, the user authentication process is accomplished by operating system automatically.
4) Authorized OS user can access Oracle database directly without providing username and password other than logon with prompting these information.
2. Official Reference
3. Best Practice
Create Oracle database user with OS authentication solution.