Introduction about Database Management Systems
- 2. Lecture Agenda…. Objective of Course Importance of Studying DBMS Defining Data Database Database Management System (DBMS) DBA Roles in Database
- 3. Database Systems What we do in this subject? Learn how to design, organize and automate organizational data for efficient use
- 4. Importance of Studying DBMS Core subject of Computer Science Able to analyze and design database Work as a DBA Could appear in certification exams like OCP(Oracle certified professional)
- 5. Text Books Text Book: “Modern Database Management”, Fred McFadden, Jeffrey Hoffer, Benjamin/Cummings Reference Books: “Database Systems” A Practical approach to design, implementation and management, 6th edi by Thomas Connolly and Carolyn Begg. “Database Management Systems”, Raghu Ramakrishnan, Johannes Gehrke, McGraw-Hill
- 6. Data Raw facts that has some meaning in user environment Data could be of type: Structured : Numerical, text, Unstructured : graphic, maps, images, sound and video segments
- 7. Data Stored representations of objects and events that have meaning and importance in the user’s environment. Information: Data that have been processed in such a way as to increase the knowledge of the person who uses the data
- 10. Database Database is a centralized, and organized collection of some logically related organizational data In database, data is organized using some Data Model
- 11. Database Operations Adding new empty files
- 13. Inserting new data into the existing files
- 14. Retrieving data from existing files Retrieval
- 15. Database Operations • Updating data in the existing files • Example – Increase the salary of Julie by 10% 9900.00
- 16. Database Operations • Deleting data from existing files • Example – Deleting the record of Julie from Employee Table
- 17. Manual Files System vs. Database System • Compactness • Speed • Less Drudgery (Labor) • Accuracy
- 18. Advantages of Database Approach • Redundancy can be reduced – Redundancy Causes Anomalies • Delete • Insert • Update
- 19. Advantages of Database Approach • Inconsistency can be avoided
- 20. Advantages of Database Approach • The data can be shared
- 21. Advantages of Database Approach • Security restriction can be applied
- 22. Advantages of Database Approach • Integrity can be maintained – Entity Integrity – Referential Integrity – Predicate Integrity
- 23. Advantages of Database Approach • Redundancy can be reduced • Inconsistency can be avoided • The data can be shared • Standard can be enforced • Security restriction can be applied • Integrity can be maintained • Conflicting requirements can be balanced
- 24. Data Model Data Model is collection of concepts and theories used to organize data Common data models are Network, Relational, Object Oriented , Object Relational etc. In short, we use some data model to organize data or build database
- 25. DBMS We use DBMS to communicate with Database Database management system is a software program used to control, accesses, update and create database Common RDBMS are Oracle, SQL Server, MySql ,Access, etc.
- 26. Database Management System • A software system that enables users to define, create, maintain, and control access to the database. DBMSApplications Applications Applications Applications
- 27. Data Management System User 1 User 2 Online User Application Database Applicant Data Student Data Course Data Faculty data
- 28. DBA Database administrator is the person responsible for analyzing , designing ,implementing and maintaining database
- 29. Roles in DBMS Environment Many individuals and groups are involved in the operations to database Generally, we could them into three type of users according to their role 1. End users 2. Application Programmers 3. Database Administrators
- 30. Database Database Management System End User Application Programmer DBA Naive Casual Prewritten Program Online Query Language Programs in C++, Java Pascal Ada, COBOL etc. Commands that Create and modify Database structure SQL SQL SQL SQL
- 31. End Users The database is designed, created and maintained to serve the information needs of End Users Casual Users are trained to use the query language Naïve users access the data through application program that are written for them
- 32. Application Programmer This group include the programmer who write application for others Each program that access the database contain queries for data management system
- 33. Database Administrator Person or group responsible for designing, creating and maintaining database Control and accesses information about data