Introduction to Database Applications

Quick notes: History and Use of DBMS

Early database applications

  • 1960s — Hierarchical and network models were introduced.
  • A bulk of world wide database still occurs using these models.

Relational Model Based Systems

  • introduced in 1970
  • Heavily researched and experimented within IBM research and several university.
  • Relational database management system products emerged in 1980s.

Object Oriented and Emerging Applications

  • OODBMS or Object oriented database management system were introduced in 1980s-1990s to cater to the needs of complex data processing in CAD and other applications.
  • Incorporated object database concepts lead to ORDBMS
  • Extended relational system added further capabilities.

Data on the Web and Ecommerce Applications

  • Data on websites are stored and processed using DBMS.
  • Web contains data in html with link among pages.
  • E-commerce using new standard like XML was born.
  • Script programming language such as PHP and JavaScript allow generation of dynamic web pages that are partially generated from database.

Main inhibitors (cost) of using a DBMS

  • High initial investment
  • Possible need of additional hardware
  • Overhead for providing generality, security, concurrency control, recovery and integrity functions.

When it is unnecessary

  • When database and applications are simple, well defined and not accepted to change.
  • if access to data by multiple users is not required.

When it is not feasible

  • When general purpose Database Management System will not fit in available storage for embedded systems.

When no DBMS may suffice

  • If there are stringent real time requirements that may not be met by DBMS overhead.
  • If database system is not able to handle the complexity of data because of modeling limitations.
  • If database users need special operations not supported by DBMS



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