About this document
DBMS Three Schema Architecture Explained by Eichhorst Automobiles is a document available to read on EtoBox.
There are three levels of data abstraction in databases: 1) The internal level defines the physical storage structure, 2) The conceptual level describes the overall database structure for all users, and 3) The external level describes the specific parts of the database relevant to individual users. The schema definitions at each level are separated to allow changes at one level without affecting the others.
- Author
- Eichhorst Automobiles
- Language
- EN