Chapter One (Introduction)
Objectives
Introduction to Database
Management Systems (DBMS)
 Relational Databases Model
 Restrictions of RD
 Database Life Cycle

Definitions
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
Introduction to Databases.
Database Management Systems(DBMS)
Relational Database Management
System
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Relational DBMS
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RDBM: Data are represented as a set of
tables (relation is a mathematical term
for a table)
Originated by E.F. Codd (1970)
Based on sets theory
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Structure of RDBM:
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A set of relations (Tables)
Each relation has a unique name
Each relation has a set of attributes
(Columns)
Each relation has a set of tuples
(Rows)
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Restriction on RDBM:
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No two tuples are the same
No two attributes are the same
The order of tuples are immaterial
The order of attributes are immaterial
There is an attribute or a collection of
attributes which identifies tuples
uniquely called Primary Key
Value of attribute must be atomic
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Restriction on RDB:
(Continued)
Example:
Student ( Name, Id, Gpa
);
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Domains

A set of legal values for an attribute
(types)
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Database Life Cycle
Analysis:
1.

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Study and analyze business
requirements
Interview managers and users for
the information requirements
Develop a system specification
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Database Lifecycle
2.
Design (Data Models)

Entity relational model (ER)
Unify modeling language (UML)

Check the design

3.
Build the Databases/Document/Test
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Create tables and views, and programs
Produce manuals
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Database Lifecycle
4.
Product delivery


Load the software
Monitor the performance
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Practice (Analysis):

Develop a System Specification for a
video store:
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