FUNDAMENTALS OF DATABASE SYSTEMS: CONCEPTS, ARCHITECTURE, AND USER ROLES

Database systems constitute a fundamental component of modern information technology infrastructure. Their development has significantly contributed to the expansion of computer applications across diverse domains, including business, healthcare, education, engineering, and digital commerce. This paper examines the essential concepts underlying database systems, beginning with a definition of a database as a structured and meaningful collection of related data representing a specific segment of reality, commonly referred to as the miniworld or universe of discourse. The study further explores the functions of Database Management Systems (DBMS), emphasizing their role in defining, constructing, manipulating, securing, and maintaining databases over time. Special attention is given to the classification of database users and the distribution of responsibilities within a database environment, including database administrators, database designers, and various categories of end users. By analyzing the interaction between system architecture and user roles, the paper highlights the organizational, technical, and operational dimensions that ensure the efficiency, reliability, and sustainability of database systems in contemporary digital environments.