Amrutha DBMS

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PRESENTATION ON

DATABASE

MANAGEMENT

SYSTEM

Submitted byAmrutha K. V.Roll no : 3

MBA (F.T) 1


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CONTENTS

Database conceptsDBMS concepts

DBMS characteristicsDBMS componentsDatabase languages

DBMS architectureDBMS advantages anddisadvantages

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DATABASE - CONCEPTS Database - Shared collection of logically

related data

Database System - Integrated collection of related files along with the details abouttheir definition, interpretation, manipulationand maintenance.

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DATABASE - APPLICATIONS Banking: all transactions Airlines: reservations, schedules Sales: customers, products, purchases Human resources: employee records,

salaries, tax deductions

Databases touches all aspects of our lives!!!!

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DBMS - CONCEPT

A database system can be run or executed byusing software called DBMS

collection of programs that manage thedatabase structure and that control sharedaccess to the data in the database .

It is the combination of data, hardware, softwareand users to help an enterprise manage itsoperational data.

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DBMS - CHARACTERISTICSThe major characteristics of databaseapproach are:Self-describing Nature of a Database

System DBMS system contains data plus a full

description of the data (called metadata )

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DBMS CHARACTERISTICS(contd. )

Program-data independence

Data independence is immunity of application programs to changes instorage structures and access techniques

In a DBMS environment changes arereflected in the catalog. Applications arent affected

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Data abstraction

DBMS provides users with a conceptualrepresentation of data

Storage details are hidden.

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Support for multiple views

DBMS may allow different users to seedifferent views of the DB, according tothe perspective each one requires

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Centralized control of the data resourceDBMS provides centralized control of datain an organization.

This brings a number of advantages:(a) reduces redundancy

(b) avoids inconsistencies(c) data can be shared

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DBMS- COMPONENTS A database system has four components

Data

Hardware

Software

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DATABASE LANGUAGES

Some main types of languages and facilitiesprovided by DBMS are

Data Definition LanguageIt is used to define the structure of thedatabase.Permits specification of data types,structures and any data constraints

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DATABASE LANGUAGE (contd. )

Data Manipulation LanguageProvides general enquiry facility (querylanguage) of the data.

It includes the command to enter andmanipulate the data

Eg: add new record, delete the existingrecord, sort etc.

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DB LANGUAGE (contd. )

SQLDeveloped in 1974 at IBMs San JoseResearch Center.

Used to define the requirement for extracting information from the database inthe form of Queries.

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DBMS - ARCHITECTURE

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DBMS - ARCHITECTURE

The generalized architecture of adatabase system is called ANSI/SPARCmodel .External/View level

The highest level of abstraction Only those parts of the entire database are

included which are of concern to a user

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DBMS ARCHITECTURE (cond. )

Conceptual/Logical level

Represents the entire database.

Database administrators, who must decide whatinformation is to be kept in the database, use

this level of abstraction

It is independent of all hardware and software.

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DBMS ARCHITECTURE (contd. )

Internal/Physical level

The lowest level of abstraction

Describes how the data are stored in thedatabase, and what relationships exist among

those data

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DBMS - ADVANTAGES

Controlling RedundancyIt stores the data on the basis of a primary key

Restricting Unauthorized Access A DBMS provides a security and authorizationsubsystem .

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DBMS ADVANTAGES (CONTD. ..)

Inconsistency can be reducedThe probability of data inconsistency is greatly

reduced in a properly designed database.Improved data sharing.

Improved data security. A DBMS provides a framework for better

enforcement of data privacy and securitypolicies.

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DBMS - DISADVANTAGESIncreased costs.Require sophisticated hardware and software

and highly skilled personnel costly!!!!

Management complexity

Damage to database affects virtually allapplications programs

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THANK YOU..

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