201141428-Database-Lecture-Note.pdf - AAU 2006 Database...

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AAU 2006 Database Instructor Seble M.T W W W . A A U . E D U . E T
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Fundamentals of Database
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Chapter One: Introduction to Database Systems AAU, Computer Science Department, 2013 Page 1 CHAPTER ONE Database System Database systems are designed to manage large data set in an organization. The data management involves both definition and the manipulation of the data which ranges from simple representation of the data to considerations of structures for the storage of information. The data management also consider the provision of mechanisms for the manipulation of information. Today, Databases are essential to every business. They are used to maintain internal records, to present data to customers and clients on the World-Wide-Web, and to support many other commercial processes. Databases are likewise found at the core of many modern organizations. The power of databases comes from a body of knowledge and technology that has developed over several decades and is embodied in specialized software called a database management system, or DBMS. A DBMS is a powerful tool for creating and managing large amounts of data efficiently and allowing it to persist over long periods of time, safely. These systems are among the most complex types of software available. Thus, for our question: What is a database? In essence a database is nothing more than a collection of shared information that exists over a long period of time, often many years. In common dialect, the term database refers to a collection of data that is managed by a DBMS. Thus the DB course is about: How to organize data Supporting multiple users Efficient and effective data retrieval Secured and reliable storage of data Maintaining consistent data Making information useful for decision making Data management passes through the different levels of development along with the development in technology and services. These levels could best be described by categorizing the levels into three levels of development. Even though there is an advantage and a problem overcome at each new level, all methods of data handling are in use to some extent. The major three levels are;
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Chapter One: Introduction to Database Systems AAU, Computer Science Department, 2013 Page 2 1. Manual Approach 2. Traditional File Based Approach 3. Database Approach 1. Manual Approach In the manual approach, data storage and retrieval follows the primitive and traditional way of information handling where cards and paper are used for the purpose. Files for as many event and objects as the organization has are used to store information. Each of the files containing various kinds of information is labeled and stored in one or more cabinets. The cabinets could be kept in safe places for security purpose based on the sensitivity of the information contained in it.
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