Database System

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  • 1. Database Concepts Data vs. Information DBMS
  • 2. Database
    • Computerized Record Keeping System
    • Collection of Data used by an organization to
      • Record its Operations
      • Support Decision Making
  • 3. Data
    • Raw facts and figures
    • Can be of type
      • Text
      • Number
      • Sound, Image, Chart, Video
  • 4. Information
    • Processed Data
    • Used for Decision Making
      • Data is also INFORMATION
      • Information creates DATA
  • 5. Examples of DB (1)
    • Admission System
    • Examination System
    • Library System
    • Payroll & Personnel Management System
    • Accounting System
    • Hotel Reservation System
    • Airline Reservation System
  • 6. Examples of DB (2)
    • Patient Recording System
    • Inventory System
    • Sales and Purchase and Accounting System
    • Knowledge-Based Management System
    • Every Government, Military, Private and other organizations plus Individual can make use of DB
  • 7. Data Management
    • Manual Filing System
    • Computerized Filing System
    • Database Systems
  • 8. Filing System
    • Every Department has its own
      • Data File(s)
      • Application to Maintain Data File(s)
  • 9. Library System - Example Members Catalog Register Members Management Application Catalog Management Application Transaction Management Application Lists of All Members, New Members, Joins between specified Dates. etc Lists of All Books, New Books, Issued Books, Lost Books,. etc Books Issued Today, Books Receipt Today, etc Files Applications Operations
  • 10. Database System
    • Single, Central, Large Repository
      • Shared Resource
      • Have Logical Connections among data items
      • DBA is responsible of its design, creation and maintenance
  • 11. Library System - Example Members Management Application Catalog Management Application Transaction Management Application Lists of All Members, New Members, Joins between specified Dates. etc Lists of All Books, New Books, Issued Books, Lost Books,. etc Books Issued Today, Books Receipt Today, etc Members Catalog Register DBMS Database
  • 12. DBMS
    • Software Package that provides
      • Support to applications
      • User-interface for on-line queries
  • 13. Advantages of DBMS (1)
      • Sharing of Data
      • Control of Redundancy
      • (unnecessary wastage of disk space)
      • Data Consistency
      • Improvement of Data Standards
      • Improvement of Data Integrity
      • (Intra-record, inter-record, referential)
      • Balancing of Conflicts
      • Faster Development of New Applications
  • 14. Advantages of DBMS (2)
      • Better Security
        • Passwords
        • Encryption
        • Views and Stored Procedures
      • Better Data Accessibility
      • (query language)
      • Economy of Scale
      • Transaction handling
      • Better backup and Recovery Procedures
  • 15. Disadvantages of DBMS
      • Higher Costs of
        • DBMS
        • Hardware
        • Conversion
        • Programming
      • Slow Processing of Some Applications
      • More Security Risks
      • More Difficult Recovery
  • 16.
    • The End