Database Reference
In-Depth Information
The Database System
Environment
This chapter discusses the environment of a database system. Topics covered include:
•
Levels of Architecture
•
Inter-level Mappings
•
Database Administrator
•
Database Management System
•
Components of the DBMS Suite
•
Front-end and Back-end Perspectives
•
Database System Architecture
•
Summary and Concluding Remarks
2.1 Levels of Architecture
In [Date, 2004], Christopher Date describes three levels of architecture of a database
system, namely, the
external level
, the
conceptual level,
and the
internal level
. These levels
are illustrated in Figure
2-1
; we will briefly discuss each.
