Oracle Default Users

Oracle database default users are created automatically during installation and serve specific roles and functions for managing the database, system maintenance, and providing examples.

1. SYS

• Description: The SYS user is the most powerful user in Oracle and owns all the base tables and views of the database dictionary.
• Function: Has full control over all database objects.

2. SYSTEM

• Description: The SYSTEM user is also a privileged user but is mainly used for database administrative tasks unrelated to the core system schema.
• Function: Manages administrative tasks for the database.

3. DBSNMP

• Description: The DBSNMP user is used by Oracle Enterprise Manager to monitor and manage the database.
• Function: Used for database monitoring.

4. SYSMAN

• Description: The SYSMAN user is the schema for Oracle Enterprise Manager, responsible for managing the database environment.
• Function: Manages Oracle Enterprise Manager.

5. HR

• Description: The HR user is part of the sample schemas, containing a human resources sample database used for tutorials and demonstrations.
• Function: Used for educational and demonstration purposes.

6. SCOTT

• Description: The SCOTT user is a widely used sample user with tables like EMP and DEPT.
• Function: Used for learning and demonstration purposes.

7. OUTLN

• Description: The OUTLN user is used for managing stored outlines that preserve execution plans for SQL queries.
• Function: Manages and optimizes SQL execution plans.