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DATABASE SYSTEM CONCEPTS AND ARCHITECTURE

DATABASE SYSTEM CONCEPTS AND ARCHITECTURE CHAPTER 2 1 LECTURE OUTLINE Data Models Three-Schema ARCHITECTURE and Data Independence DATABASE Languages and Interfaces The DATABASE SYSTEM Environment DBMS Architectures Classification of DATABASE Management Systems 2 DATA MODEL Collection of CONCEPTS that describe the structure of a DATABASE Provides means to achieve data abstraction Suppression of details of data organization and storage Highlighting of the essential features for an improved understanding of data Includes basic operations Retrievals and updates on the DATABASE Dynamic aspect or behavior of a DATABASE application Allows the DATABASE designer to specify a set of valid operations allowed on DATABASE objects 3 CATEGORIES OF DATA MODELS High-level or conceptual data models Close to the way many users perceive data For example, object-oriented models Low-level or phy

Collection of concepts that describe the structure of a database Provides means to achieve data abstraction •Suppression of details of data organization and storage ... •Connected to various printers; all print requests by the clients are forwarded to this machine

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