DBMS.pptx
- 1. Introduction to DBMS DR. REENA CHANDRA
- 2. Data Base Management System Collection of interrelated data Set of programs to access the data DBMS contains information about a particular enterprise DBMS provides an environment that is both convenient and efficient to use. Database Applications: Banking: all transactions Airlines: reservations, schedules Universities: registration, grades Sales: customers, products, purchases Manufacturing: production, inventory, orders, supply chain Human resources: employee records, salaries, tax deductions Databases touch all aspects of our lives
- 3. What is a Database A Database is an organised, persistent collection of data of an organisation.
- 4. Earlier Systems File Based Systems File based systems were an early attempt to computerise the manual filling system. The manual filling system works well when the number of items to be stored is small. A manual system crashes when cross – referencing and processing of information in the files is carried out.
- 5. Earlier Systems File Based Systems Consider a university having different courses with different number of students enrolled in the university courses. Corresponding to each course there are different faculty members. Which files will the university have to maintain?? Now answer the following queries:- Annual fees paid by students of Computer Science Department No. of students requiring transport facility from a particular area. This year’s turnover of students compared to last year Are you able to get all answers…………
- 6. ORGANIZING DATA IN A TRADITIONAL FILE ENVIRONMENT File Organization Terms and Concepts • Bit: Smallest unit of data; binary digit (0,1) • Byte: Group of bits that represents a single character • Field: Group of words or a complete number • Record: Group of related fields • File: Group of records of same type
- 8. Limitations of File based systems Separation and isolation of data Duplication of data Inconsistent data Data dependence Incompatible File Formats Fixed Queries
- 9. Why use database Data is a valuable corporate resource which needs adequate accuracy, consistency and security controls. The centralised control of data means that for many applications the data will already exist , and facilitate quicker development. Data will no longer be related by application programs , but by the structure defined in the database. Easier to maintain systems.
- 10. Advantages of Database Systems Reduction of Redundancies Shared data Data Independence Improved Integrity Efficient data access Improved Security Improved Backup and Recovery Support for Concurrent Transactions
- 11. Database Management System (DBMS) Software for creating and maintaining databases Permits firms to rationally manage data for the entire firm Acts as interface between application programs and physical data files Separates logical and design views of data Solves many problems of the traditional data file approach
- 13. Any Queries??
- 14. THANK YOU