Introduction of dbms
- 1. Database Management System Asst.Prof. Rupali Lohar Dept. of Computer Science & Engineering B. R. Harne College Of Engineering & Technology, Karav, Post Vangani (W Tal Ambernath, Mumbai, Maharashtra 421503
- 2. Overview: • INTRODUCTION TO BASIC CONCEPTS OF DATABASE SYSTEMS • Characteristics of DB • Applications of DB • DBMS • Need of DBMS • Advantages of DBMS • FILE ORIENTED APPROACH • DB User • Levels of abstraction in a DBMS • Data Independence
- 5. Difference between data and information: DATA INFORMATION 1.Raw facts 1.Processed data 2. It is in unorganized form 2. It is in organized form 3.Data doesn’t help in Decision making process 3. Information helps in Decision making process
- 6. File oriented approach • The earliest business computer systems stored groups of records in separate files, and so they were called file processing systems. • They were generally faster and more accurate than equivalent manual systems.
- 7. Disadvantages of file-oriented system: • Data Redundancy and Inconsistency • Difficulty in Accessing Data • Data Isolation • Security Problems • Atomicity Problems
- 8. Database • A database is a collection of information that is organized so that it can be easily accessed, managed and updated. • For example: The college Database organizes the data about the admin, staff, students and faculty etc. • Using the database, you can easily retrieve, insert, and delete the information.
- 9. Applications of Database Systems • Banking • Airlines • Universities • Credit Card Transactions • Telecommunication • Finance • Manufacturing • Human resources • Railway Reservation Systems • Web • E –Commerce
- 10. Characteristics of database • Structured and Described Data • Control of data redundancy • Data sharing • Data Integrity • Restriction of unauthorized access • Data Independence • Backup and recovery facilities • Transaction processing
- 11. Database-management system • Database management system is a software which is used to manage the database. For example: MySQL, Oracle, etc are a very popular commercial database which is used in different applications. • It provides protection and security to the database. In the case of multiple users, it also maintains data consistency.
- 12. Need of DBMS: • Before the advent of DBMS, organizations typically stored information using a “File Processing Systems”. • Database systems are designed to manage large bodies of information. • In addition to that the database system must ensure the safety of the information stored, despite system crashes or attempts at unauthorized access. If data are to be shared among several users, the system must avoid possible anomalous results.
- 13. Advantages of a DBMS over file system • Data Independence • Efficient Data Access • Data Integrity and Security • Concurrent Access and Crash Recovery
- 14. DBMS vs. File System