2-Database Concepts a Mis

8/6/2019 2-Database Concepts a Mis

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ATABASE CONCEPTSATABASE CONCEPTSPankaj Joge

[email protected]

Mobile # 9617661234
mailto:[email protected]:[email protected]


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WHAT IS DATABASE?

Collection of Coherent data with some Inherentmeaning.

Database are designed, built and populatedwith data for a specific purpose

Example: Postal Address and what else?

Difference between Address Book and PostalAddress


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Examples of database in reallife

A telephone book

T.V. Guide

Airline reservation system

Motor vehicle registration records

Papers in your filing cabinet

Files on your computer hard drive.


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DATABASE MANAGEMENTSYSTEM

System that helps in managing data

System that allows inserting, updating,deleting and processing of the data

Examples: Oracle, Ingress, Sybase, Dbase 3+,Foxbase, Foxpro, MS Access, Dataease,Dataflex, Advanced Revelation and so on

Objects, their attributes and the relationshipbetween them (that are of interest to us) arestored in the database


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DBMS Vs File ManagementSystem

A FMS is how data is stored on computer inDrives

By placing data electronically in files.

These files are then stored in specific locationson the hard disk (directories).

If the user wishes to perform some operationhe has to scroll through all the data byhimself in order to see the data he isinterested in.

A user has to know where he put the files that

contain the data and also if there are


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DBMS Vs File ManagementSystem

A Database Management System intends to :

Remove the burden of manually locating data.

Having to scroll through it by allowing the userto create a logical structure for the databeforehand.

Allowing the user to place the data in thedatabase that the DBMS is managing.


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Functions of DBMS

Data Definition

Data Maintenance

Data Manipulation

Data display

Data Integrity


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Benefits of DBMS

Establishes Relationships between Data

No data inconsistencies

Reduction of data redundancyData can be shared by single or multiple users

Standards can be set and followed

Data integrity can be maintained

Security of the data can be simplyimplemented

Data independence can be achieved


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Shortcomings

COST

COMPLEXITY

Problems Associated With CENTRALISATION


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Database Architecture

A -2 Tie r Architecture

The server holds both the application and thedata.

The application resides in the server.

Server will have more processing power and

disk space .

C LIE N T S E R V E R


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Database Architecture

A -3 Tie r Architecture

The data and applications are split onto separateservers.

The client is a front end simply requesting &displaying data.

C LIE N T DATABASESERVERAPPLICATIONSERVER


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DATABASE MODELS

Databases appeared in the late 1960s, at atime when the need for a flexible informationmanagement system had arisen.

There are five models of DBMS, which aredistinguished based on how they representthe data contained


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FIVE DBMS MODELS

Hierarchicalierarchical

Networketwork

RelationalelationalDeductiveeductive

Objectbject


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RELATIONAL DBMS

DBMS that is based on the relational model asintroduced by Dr. Edgar F. Codd

Stores data in the form of related tablesPowerful because they require few

assumptions about how data is related or howit will be extracted from the database

Same database can be viewed in manydifferent ways

Single database can be spread across severaltables


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Have a nice day

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2-Database Concepts a Mis