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Lecture 2

Instructor: Saleem Raza

Databases

Source: DATABASE CONCEPTS KroenkePearson Education, Inc. Publishing as Prentice Hall

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Database Systems

The four components of a database

system are:

Users Database Application

Database Management System (DBMS)

Database

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Components of a Database

System

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Users

A userof a database system will

Use a database application to track things

Use forms to enter, read, delete and querydata

Produce reports

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The Database

A database is a self-describingcollection of

related records

Self-describing

The database itself contains the definition of

its structure

Metadata is data describing the structure of

the database data Tables within a relational database are related to

each other

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Database Contents

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Example Database Metadata:A Relationship Diagram

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Database Management

System (DBMS) A database management system

(DBMS) serves as an intermediary

between database applications and the

database

The DBMS manages and controls

database activities

The DBMS creates, processes and

administers the databases it controls

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Functions of a DBMS

Create databases

Create tables

Create supporting structures

Read database data Modify database data (insert, update, delete)

Maintain database structures

Enforce rules

Control concurrency Provide security

Perform backup and recovery

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Database Applications

A database application is a set of one or

more computer programs that serves as

an intermediary between the user and the

DBMS

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Functions of Database

Applications Create and process forms

Process user queries

Create and process reports Execute application logic

Control database applications

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Database Applications:Example Data Entry Form

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Database Applications:Example Query

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Database Applications:Example Report

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Personal Database Systems

Personal database systems typically:

Have one application

Have only a few tables Are simple in design

Involve only one computer

Support one user at a time

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Personal Database Systems

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Enterprise-Class

Database Systems Enterprise-Class database systems

typically:

Support several users simultaneously Include more than one application

Involve multiple computers

Are complex in design

Have many tables

Have many databases

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Organizational Database Systems

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Commercial DBMS Products

Example Desktop DBMS Products

Microsoft Access

Example Organizational DBMS Products Microsofts SQL Server

Oracles Oracle

Sun Microsystems MySQL IBMs DB2

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