Special type of user.

Coordinates all the activities of the database system; the database administrator has a good understanding of the enterprise’s information resources and needs.

Database administrator's (DBA) duties include:

• Schema definition
• Storage structure and access method definition
• Schema and physical organization modification
• Granting user authority to access the database
• Specifying integrity constraints
• Creating stored procedures
• Acting as liaison with users
• Monitoring performance and responding to changes in requirements

Similar to Unix system administrator, but for the database (DBMS)