DB Organization: Data Abstraction

1. View Level:
   • Highest level.
   • Describes part of the database for a particular group of users.
   • Can be many different views of a database.
2. Conceptual Level:
   • Intermediate level of abstraction.
   • Describes what data are stored.
   • Describes the relationships among data.
   • Database administrator level.
3. Physical Level:
   • Lowest level of abstraction.
   • How the data are stored. E.g. index, B-tree, hashing.
   • Complex low-level structures described in detail.