Download Database Management System (DBMS) an Introduction

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Database Management
System (DBMS) an
Introduction
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Intro to DBMS
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• Understand why databases are important to modern
organizations
• Understand how databases work
• Understand how organizations can maximize their strategic
potential with databases
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Objectives
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Data is a vital part of any organization. It needs to be
stored, organized, managed, accessed, protected and
manipulated.
Operational
Use databases to:
 Create a book
 Track book sales
 Set salaries and wages
 Pay employees
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Intro to DBMS
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Intro to DBMS
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• The purpose of a database is to keep track of things
• Unlike a list or spreadsheet, a database may store information
that is more complicated than a simple list
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Purpose of DBMS
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Intro to DBMS
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• The Database Approach: Foundational Concepts
• DBMS – Database Management Systems
• Use a DBMS software to create, store, organize, and retrieve
data from a single database or several databases
• Example: Microsoft Access
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Database Management for Strategic Advantage
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• Advantages of the Database Approach
• Program-data independence
• Minimal data redundancy
• Improved data consistency
• Improved data sharing
• Increased productivity of application development
• Enforcement of standards
• Improved data quality
• Improved data accessibility
• Reduced program maintenance
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Intro
to
DBMS
Database Management for Strategic Advantage
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Intro to DBMS
• Works with programmers and analysts to design and implement the
database
• Works with users and managers to establish database policies
• Implements security features and establishes database permissions
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• Effective Management of Databases
• The database administrator (DBA) :
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Database Management for Strategic Advantage
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• The four components of a database system are:
• Users
• Database Application
• Database Management System (DBMS)
• Database
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Intro to DBMS
Database Systems
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Intro to DBMS
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Database Systems
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Intro to DBMS
A user of a database system will
 Use a database application to track things
 Use forms to enter, read, delete and query data
 Produce reports
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Database Systems - Users
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Intro to DBMS
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• A set of one or more computer programs that serves as an
intermediary between the users and the DBMS
• Application program that read or modify database data by sending
SQL statements to DBMS.
• Application program to present data to users in the format of
forms and reports.
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Database Systems – Database Application
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Intro to DBMS
Create and process forms
Process user queries
Create and process reports
Execute application logic
Control database applications
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Database Systems – Database Application :
Functions
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Intro to DBMS
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A computer program used to create, process and administer
the database
DBMS receives request encoded in SQL and translates these
requests into actions on the database
DBMS is a large, complicated program that is licensed
software. Almost majority of the companies never write their
own DBMS program.
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Database Systems – DBMS
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Intro to DBMS

The database is a collection of related tables and other
structures.
A database is a self-describing collection of related records
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
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Database Systems – Database
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Intro to DBMS
Create databases
Create tables
Create supporting structures
Read database data
Modify database data (insert, update, delete)
Maintain database structures
Enforce rules
Control concurrency
Provide security
Perform backup and recovery
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Functions of DBMS
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Intro to DBMS
Organizational DBMS
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Intro to DBMS
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Support several users simultaneously
Include more than one application
Involve multiple computers
Are complex in design
Have many tables
Have many databases
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• Organizational database systems typically:
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Organizational DBMS
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