What are the default users in Oracle?

Oracle database creates multiple users by default, with specific permissions and responsibilities: SYSTEM: the highest authority user, used to create and manage objects, and is responsible for system maintenance. SYS: Internal system user, responsible for managing data dictionary and metadata. SYSMAN: System monitoring and management user for monitoring database performance and health. SYSDBA: Database administrator user with similar permissions as SYSTEM, but limited to a single database. ORPLUGINS: Oracle plug-in user, used to install and manage plug-ins. OUTLN: Schema user, used to create objects such as storage outlines. CTXSYS: Text index user, used to manage text indexing and full-text search functions.

Oracle Default Users

Oracle database will create some default users after installation. These users have different permissions and responsibilities for managing and operating the database.

SYSTEM user

• The highest-level user has all permissions on the database.
• Used to create and manage database objects (such as tables, views, and stored procedures).
• Responsible for system maintenance and troubleshooting.

SYS user

• Internal system user, used for internal operations of the database.
• cannot be modified or deleted.
• Responsible for managing data dictionary and metadata.

SYSMAN User

• System monitoring and management users.
• Has permission to view performance statistics, create monitoring views, and set alerts.
• Used to monitor the health and performance of the database.

SYSDBA User

• Database Administrator User.
• Has similar permissions as the SYSTEM user, but the permissions are limited to the current database.
• Used to manage and maintain a single database.

ORDPLUGINS User

• Oracle plug-in user.
• For installing and managing Oracle plug-ins such as Spatial Data Toolkit or Advanced Security Options.

OUTLN User

• Mode user.
• Used to create and store database objects such as storage outlines.

CTXSYS User

• Text Index User.
• Responsible for managing text indexing and full-text search functions.

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