Database Management System (DBMS) an Introduction

Database Management System (DBMS) an Introduction

Intro to DBMS
Understand why databases are important to modern organizationsUnderstand how databases workUnderstand how organizations can maximize their strategic potential with databases
Objectives

Intro to DBMS
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 bookTrack book salesSet salaries and wagesPay employees

Purpose of DBMS
The purpose of a database is to keep track of thingsUnlike a list or spreadsheet, a database may store information that is more complicated than a simple list
Intro to DBMS

Database Management for Strategic Advantage
The Database Approach: Foundational ConceptsDBMS Database Management SystemsUse a DBMS software to create, store, organize, and retrieve data from a single database or several databasesExample: Microsoft Access
Intro to DBMS

Database Management for Strategic Advantage
Advantages of the Database Approach Program-data independenceMinimal data redundancyImproved data consistencyImproved data sharingIncreased productivity of application developmentEnforcement of standardsImproved data qualityImproved data accessibilityReduced program maintenance
Intro to DBMS

Database Management for Strategic Advantage
Effective Management of DatabasesThe database administrator (DBA) :Works with programmers and analysts to design and implement the databaseWorks with users and managers to establish database policiesImplements security features and establishes database permissions
Intro to DBMS

Intro to DBMS
The four components of a database system are:UsersDatabase ApplicationDatabase Management System (DBMS)Database
Database Systems

Intro to DBMS
Database Systems

A user of a database system willUse a database application to track thingsUse forms to enter, read, delete and query dataProduce reports
Database Systems - Users
Intro to DBMS

A set of one or more computer programs that serves as an intermediary between the users and the DBMSApplication 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.
Intro to DBMS
Database Systems Database Application

Create and process formsProcess user queriesCreate and process reportsExecute application logicControl database applications
Database Systems Database Application : Functions
Intro to DBMS

Intro to DBMS
Database Systems DBMS
A computer program used to create, process and administer the databaseDBMS receives request encoded in SQL and translates these requests into actions on the databaseDBMS is a large, complicated program that is licensed software. Almost majority of the companies never write their own DBMS program.

Intro to DBMS
Database Systems Database
The database is a collection of related tables and other structures.A database is a self-describing collection of related records

Create databasesCreate tablesCreate supporting structuresRead database dataModify database data (insert, update, delete)Maintain database structuresEnforce rulesControl concurrencyProvide securityPerform backup and recovery
Intro to DBMS
Functions of DBMS

Intro to DBMS
Organizational DBMS

Organizational database systems typically:Support several users simultaneouslyInclude more than one applicationInvolve multiple computersAre complex in designHave many tablesHave many databases
Intro to DBMS
Organizational DBMS