Simplified Database System Environment:

A DBMS (database management system) is a collection of programs that enables users to create and maintain database. The DBMS is a common purpose software system that facilitates the process of constructing, defining, manipulating and sharing databases among various users as well as applications. Defining a database state the database involves specifying the constraints, data types and structures of the data to be stored in the database. The descriptive information is as well stored in the database in the form database catalogue or dictionary- it is called meta-data.

Manipulating the data comprises the querying the database to retrieve the specific data.

An application program accesses the database through transferring the quarries or requests for data to DBMS.

The significant function provided by the DBMS includes protecting the database and maintain the database.

Illustration of a Database (with a Conceptual Data Model):

• Mini-world for the example:

Component of a UNIVERSITY environment.

• A few 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

Example of a simple Database:

Example of a Student File:

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