Download Database Management System (DBMS) an Introduction

Database Management
System (DBMS) an
Introduction
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Intro to DBMS
Objectives
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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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Intro to DBMS
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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
Purpose of 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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Intro to DBMS
Database Management for Strategic Advantage
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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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Intro to DBMS
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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Effective Management of Databases
 The database administrator (DBA) :
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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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Intro to DBMS
Database Systems
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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
Database Systems - Users
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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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Intro to DBMS
Database Systems – Database Application
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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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Intro to DBMS
Database Systems – Database Application :
Functions
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Create and process forms
Process user queries
Create and process reports
Execute application logic
Control database applications
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Intro to DBMS
Database Systems – 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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Intro to DBMS
Database Systems – Database
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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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Intro to DBMS
Functions of DBMS
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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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Intro to DBMS
Organizational DBMS
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Intro to DBMS
Organizational DBMS
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Organizational database systems typically:
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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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