Database Systems: Design, Implementation, and Management



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Database systems and benefits

Network Database Model

  • Advantages
  • Disadvantages
    • System complexity
    • Lack of structural independence

Relational Database Model

  • Database Systems: Design, Implementation, & Management, 5th Edition, Rob & Coronel
  • Most widely used model today
  • Perceived by user as a collection of tables for data storage
  • Tables are a series of row/column intersections
  • Tables related by sharing common entity characteristic(s)

Relational Database Model (con’t.)

  • Database Systems: Design, Implementation, & Management, 5th Edition, Rob & Coronel
  • Figure 1.11

Relational Database Model

  • Database Systems: Design, Implementation, & Management, 5th Edition, Rob & Coronel

Relational Database Model

  • Database Systems: Design, Implementation, & Management, 5th Edition, Rob & Coronel
  • Disadvantages
    • Substantial hardware and system software overhead
    • Poor design and implementation is made easy
    • May promote “islands of information” problems

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