The document provides an introduction to database management systems (DBMS). It discusses the components of a DBMS environment including hardware, software, data, and procedures. It also outlines the roles in a database environment, the history of database systems, and the functions of a DBMS. Advantages include data control and consistency, while disadvantages include complexity, size, and costs.

1. DBMS Emraan Ahmad Reg no. 520789486 Bsc-it 6 th Sem Sikkim manipal university

2. Content Objectives Introduction of DBMS Component of Dbms environment Features of Dbms Roles in the Database environment History of Database system Functions of Dbms Advantages of Dbms Disadvantages of Dbms

3. Introduction Collection of interrelated data. Set of programs to access data. Database Applications : Banking: all transactions Airlines: reservations, schedules Universities: registration, grades Sales: customers, products, purchases Human resources: employee records, salaries, tax deductions DBMS

4. Components of DBMS Environment 16

5. Component of Database System

6. Components of DBMS Environment Hardware Can range from a PC to a network of computers. Software DBMS, operating system, network software (if necessary) and also the application programs. Data Used by the organization and a description of this data called the schema. 17

7. Components of DBMS Environment Procedures Instructions and rules that should be applied to the design and use of the database and DBMS. People 18

8. Features of DBMS Accept data input & store Multi-user access Security Query languages (searching, sorting) DBMS

9. Roles in the Database Environment Data Administrator (DA) Database Administrator (DBA) Database Designers (Logical and Physical) Application Programmers End Users (native and sophisticated) 19

10. History of Database Systems First-generation Hierarchical and Network Second generation Relational Third generation Extended Relational Object-Oriented 20

11. 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 Functions of DBMS

12. Advantages of DBMS Control of data redundancy. Data consistency More information from the same amount of data. Sharing of data. Improved data integrity. Improved security. Enforcement of standards. Economy of scale. 21

13. Advantages of DBMS Balanced conflicting requirements Improved data accessibility and responsiveness Increased productivity Improved maintenance through data independence Increased concurrency Improved backup and recovery services 22

14. Disadvantages of DBMS Complexity Size Cost of DBMS Additional hardware costs Cost of conversion Performance Higher impact of a failure 23

15. ORACLE ORACLE is the no.1 RDBMS. ORACLE Corporation Ltd. is the name of the company. It belongs to backend section & also to the frontend s/w is D2k(Developer 2000), now it is J Developer. It is a two Tier Application.