Copyright 2002 by
Prentice Hall, Inc.
Managing Data: The Three-Level
See Figure 7-4
- The external, conceptual, or local level,
containing the various “user views” of the
corporate data that each application program uses
- The logical or “enterprise data” level,
encompassing all an organization’s relevant data,
under the control of the data administration.
- The physical or storage level, specifying
the way the data is physically stored