Chapter One (Introduction)

Objectives Introduction to Database Management Systems (DBMS) Relational Databases Model Restrictions of RD Database Life Cycle

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Definitions Introduction to Databases. Database Management

Systems(DBMS) Relational Database Management

System

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Relational DBMS 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:

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:

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

1. Analysis:

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 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: