database system

Company

LOGO

Database System

I Gde Dharma N

Fenomena “Information Overload”

“The percentage of unstructured data is 85% of the total and

growing..”---Delphi Group Survey, 2008

Data VS Information :What is the difference?

What is Data?

Data can be defined in many ways.Data is a collection of facts, such as

values or measurements.Data can be defined in many ways.

Information science defines data as unprocessed information.

It can be numbers, words, measurements, observations or even just descriptions of things.

What is Information?

Information is data that have been organized and communicated in a coherent and meaningful manner.

Data is converted into information, and information is converted into knowledge.

Knowledge; information evaluated and organized so that it can be used purposefully.

Universe of Discourse

A database is a model of some aspect of the reality of an organisation.

It is conventional to call this reality a universe of discourse (UoD), or a domain of discourse.

Universe ofDiscourse

Database Design Database Scheme

What is Database?

A Database is any collection of data.Models a real-world enterpriseA DBMS is a software system designed to

maintain a database.We use a DBMS when

there is a large amount of data security and integrity of the data are important many users access the data concurrently

Factbases Datum

PersistenceIntensional dan Extensional PartsIntegrity

Redudancy Transactions Integrity Constraints

Nature of Database

Data Model

Hierarchy Data ModelNetwork Data ModelRelational Data Model

DBMS Approach

Top-Down Approach, start making database with planning stage. Example : Entity Relationship Diagram.

Bottom-Up Approach, used to transform from traditional system or form to database.

Why use a DBMS?

Without a DBMS, we’d have :

Data stored as bits on disk organized as files

Access by a collection of ad hoc programs

Users of the data

There is no control or coordination of what

these program do with the data

Why use a DBMS?

With a DBMS, we have :

Data stored as bits on disk organized as files

Application

Users of the data

DBMS provide control and coordination to

protect the data.

DBMS

DBMS Advantage

High Performance for large data.Data Integrity.Data Independence.Centralization of data.Data Security more flexible.

Main Component of Database

HardwareSoftwareDataUser

Layers of Data Abstraction

View 1 View 2 View 3

Conceptual Schema / Internal Schema / Logical Schema

DatabaseFile

External Layer

Logical Layer

Physical Layer

Functional Component of Database

Database ManagerFile ManagerDisk Manager

Database Development Life Cycle

Thank you for your attention.

Any Question?????