What is Database Management System?
- A database management system (DBMS) is a collection of programs that enables users to create and maintain a database.
- The DBMS is hence a general-purpose software system that facilitates the processes of defining, constructing, and manipulating databases for various applications.
What is Database Management System?
- Database System: The DBMS software together with the data itself. Sometimes, the applications are also included.
Example of a Database (with a Conceptual Data Model)
Mini-world for the example: Part of a UNIVERSITY environment.
Some mini-world entities:
STUDENTs
COURSEs
SECTIONs (of COURSEs)
(academic) DEPARTMENTs
INSTRUCTORs
Example of a Database (with a Conceptual Data Model)
Some mini-world relationships:
SECTIONs are of specific COURSEs
STUDENTs take SECTIONs
COURSEs have prerequisite COURSEs
INSTRUCTORs teach SECTIONs
COURSEs are offered by DEPARTMENTs
STUDENTs major in DEPARTMENTs
Note: The above could be expressed in the ENTITY-RELATIONSHIP data model.
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