Week 5-6: Database Schema Architecture
The three schema architecture is also called ANSI/SPARC architecture or three-level architecture. This framework is used to describe the structure of a specific database system. The three schema architecture is also used to separate the user applications and physical database.
There are mainly three levels of data abstraction:
- Internal Level: Actual PHYSICAL storage structure and access paths.
- Conceptual or Logical Level: Structure and constraints for the entire database
- External or View level: Describes various user views