DataBase Management System (DBMS) Textbook by RamaKrishnan
The alIlount of information available to us is literally exploding, and the value of data as an organizational asset is widely recognized. To get the most out of their large and complex datasets, users require tools that simplify the tasks of managing the data and extracting useful information in a timely fashion. Otherwise, data can become a liability, with the cost of acquiring it and managing
it far exceeding the value derived from it.
it far exceeding the value derived from it.
A database is a collection of data, typically describing the activities of one or more related organizations.
For example, a university database might contain information about the following:
• Entities such as students, faculty, courses, and classrooms.
• Relationships between entities, such as students' enrollment in courses, faculty teaching courses, and the use of rooms for courses.
A database management system, or DBMS, is software designed to assist in maintaining and utilizing large collections of data. The need for such systems, as well as their use, is growing rapidly. The alternative to using a DBMS is to store the data in files and write application-specific code to manage it. The use of a DBMS has several important advantages
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