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Database Management System (DBMS) an Introduction
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Intro to DBMS
• Understand why databases are important to modern organizations
• Understand how databases work• Understand how organizations can maximize their strategic
potential with databases
Objectives
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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 book Track book sales Set salaries and wages Pay employees
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Purpose of DBMS
• 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
Intro to DBMS
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Database Management for Strategic Advantage
• 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
Intro to DBMS
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Database Management for Strategic Advantage
• 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
Intro to DBMS
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Database Management for Strategic Advantage
• Effective Management of Databases• The database administrator (DBA) :
• 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
Intro to DBMS
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Intro to DBMS
• The four components of a database system are:• Users• Database Application• Database Management System (DBMS)• Database
Database Systems
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Intro to DBMSDatabase Systems
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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
Database Systems - UsersIntro to DBMS
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Intro to DBMSDatabase Systems – Database Application
• 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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• Create and process forms• Process user queries• Create and process reports• Execute application logic• Control database applications
Database Systems – Database Application : Functions
Intro to DBMS
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Intro to DBMSDatabase Systems – DBMS
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 DBMSDatabase Systems – Database
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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• 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
Intro to DBMSFunctions of DBMS
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Intro to DBMSOrganizational DBMS
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• Organizational database systems typically:• Support several users simultaneously• Include more than one application• Involve multiple computers• Are complex in design• Have many tables• Have many databases
Intro to DBMSOrganizational DBMS
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