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A STUDY ON DATABASE MANAGEMENTA STUDY ON DATABASE MANAGEMENTSYSTEM( REFERENCE TO BINKERS HOTEL)SYSTEM( REFERENCE TO BINKERS HOTEL)

ZABI ULLAH MOQIMMBA IIIrd SEM

051

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Silberschatz, Korth and Sudarshan1.2Database System Concepts

OBJECTIVES OF THE STUDYOBJECTIVES OF THE STUDY

To understand the concept of DBMS

To numerate the benefits and advantages ofDatabase Management System .

To evaluate the case of BINKERS HOTEL in

applying DBMS

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Database Management System (DBMS)Database Management System (DBMS)

Collection of interrelated data Set of programs to access the data

DBMS contains information about a particular enterprise

atabase Applications:

Banking: all transactions Airlines: reservations, schedules

Universities: registration, grades

Sales: customers, products, purchases

Manufacturing: production, inventory, orders, supply chain

Human resources: employee records, salaries, tax deductions

Databases touch all aspects of our lives

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Purpose of Database SystemPurpose of Database System

In the early days, database applications were built on top

of file systems

Drawbacks of using file systems to store data:

Data redundancy and inconsistency

Multiple file formats, duplication of information in different files

Difficulty in accessing data

Need to write a new program to carry out each new task

Data isolation multiple files and formats

Integrity problems

Security problems

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Advantages of DBMSAdvantages of DBMS

Enforcement of standards Improved data accessibility

Improved data quality

Improved data sharing Reduced program

maintenance Increased productivity of development staff

Program-data independence

Minimal data redundancy Improved data consistency

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Functions of DBMSFunctions of DBMS

Indexing

Views

Security

Integrity

Concurrency

Backup/Recovery

Design

Documentation

Update/Query

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Data ModelsData Models

A collection of tools for describing

data

data relationships

data semantics

data constraints

Entity-Relationship model

Relational model

Hierarchical Model

Network Data Model

Relational Data Model

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EntityEntity--Relationship ModelRelationship Model

Example of schema in the entity-relationship model

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Entity Relationship Model (Cont.)Entity Relationship Model (Cont.)

E-R model of real world Entities (objects)

E.g. customers, accounts, bank branch

Relationships between entities

E.g. Account A-101 is held by customer Johnson

Relationship set depositor associates customers with accounts

Widely used for database design

Database design in E-R model usually converted to design in the relational

model (coming up next) which is used for storage and processing

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Relational ModelRelational Model

Example of tabular data in the relational model

customer-

nameCustomer-id

customer-

street

customer-

city

account-

number

Johnson

Smith

Johnson

Jones

Smith

192-83-7465

019-28-3746

192-83-7465

321-12-3123

019-28-3746

Alma

North

Alma

Main

North

Palo Alto

Rye

Palo Alto

Harrison

Rye

A-101

A-215

A-201

A-217

A-201

Attributes

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Our study case: HotelOur study case: Hotel Bincker'sBincker's

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HotelHotel Bincker'sBincker's

In the last few years Hotel Bincker's has grown from a small villagehostel into a medium sized business hotel in a rapidly growing

small silicon village town. And the desk has no time to keep track

of all information needed to take care of its guests in a proper way.

is vaguely muttered by the manager after he lost your name again,

did not cross off the room on his blackboard and booked the sameroom twice.

Some weeks later when you show up at Hotel Bincker's desk the

manager will finger through his agenda which is ordered by date

and he will find your reservation. This method works well for asmall hotel. Guests are coming back and the hotel's business is

profitable again

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Quick view for occupied roomsQuick view for occupied rooms

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