Unit1 Intro to Database Fundamentals_V1

7/28/2019 Unit1 Intro to Database Fundamentals_V1

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Unit 1 :

Overview of Database Fundamentals

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Topics

Need for databases

Database Application Areas

Basic concepts and definition

Data Vs. Information

Metadata

Database Design

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Data Model


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Introduction

Need for databases

Database System Applications

Customer Relationship Management

Sales On-Line retailers

Manufacturing

Human resources


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Banks


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Travel


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Finance


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Universities


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Libraries

http://www.easylib.com/


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Enterprises


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Basic Concepts and Definitions

Database Management System :

It is a collection of interrelated data and a set of programs toaccess those data.

Database : An organized collection of logically related data.

Data :


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, , ,

that have meaning in the users environment.

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Information :

Data that have been processed in such a way as to increasethe knowledge of the person who uses the data.


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Data Vs Information

Information is what you want;

Data is what you get.

Name Address PhoneNumber

E-mail

John Cook 255 Main St. 543-7885 [email protected]


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MatthewSmith

43 First Ave. 423-4567 [email protected]

EmilyCoffey

2 Meadow Ln. [email protected]

m

MaryFrance

43 StrawberryRd.

231-5926 [email protected]


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Graphical displays turn data into usefulinformation that managers can use for

decision making and interpretation


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Metadata

Data that describe the properties orcharacteristics of other data.


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Descriptions of the properties or characteristics

of the data, including data types, field sizes,

allowable values, and data context


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View of Data

Schemas The overall design of the database is called the database

schema.

View 1 View 2 View n

Data Abstraction


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Physical Schema

Physical

Database

1. View Level2. Logical Level

3. Physical Level


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Database Design

Captures and represents associations andrelationships among the real world objects.

Capture flow of information

Benefits of a good design Maintainability, Scalability, Reliability


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Design Process

Step 1: Specifications of User Requirements

Step 2: Choice of Data Model -> Conceptual Design

Step 3: Specification of Functional Requirements

Step 4: Logical Design Phase

Step 5: Physical Design Phase


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Data Models

A database model is a specification describing how adatabase is structured and used

A data model says what information is to be contained ina database, how the information will be used, and howthe items in the database will be related to each other

iv f D M lin


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Understanding of meaning semantics of data Facilitate communication about information requirements

Data Modeling ensures

Clear understanding of each users perspective of the data

The nature of the data itself, independent of its physicalrepresentations

Use of data across application areas


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Overview of Data Models

E R Model Hierarchical Model

Network Model

Relational Model Object Based Data Model

Object Relational Model


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Semi-structured Data Model


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Evolution of Database System


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A quick recap

Need for databases Database Application Areas

Basic concepts and definition

Data Vs. Information Metadata

Database Design


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Please try to limit the questions to the topics discussed during the session. Thank you.

Question time


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Unit1 Intro to Database Fundamentals_V1

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