Operational DatabasesEnd User DatabasesCentralized DatabasesDistributed DatabasesPersonal DatabasesCommercial Databases

Data relating to operations of an enterpriseOrganized on functional lines such as

marketing, production etcExample - one that is used to take orders and

fulfill them. It is based on accounts and transactions

These databases consist of data developed by individual end-users.

Managers at different levelsExamples of these are collections of

documents in spreadsheets, word processing

Concentrate at a single place or area. Store entire information and application

programs at a central facilityExample – MTNL has a centralized Database

for registration of applications

Contribution from common databasesstored in multiple computers located in the

same physical location, or may be dispersed over a network of interconnected computers.

Subject specific, user designed databasesMeant for personal use say by a dept

Contain information that external users require but cannot afford to maintain such huge databases

Subject SpecificFinancial & technical informationExample - The Spire Project: Commercial

Databases

1. Determine purpose2. Determine tables, fields3. Identify Unique keys4. Determine Relationships between tables

Students Social Sec. Num. Name (Last, First) Matriculation Date

Departments Dept ID Dept Name Dept Chair Faculty ID Dept Room Dept Office Phone

Courses Dept ID Course Number Course Name Hours

Classes Course Number Section Year semester Faculty ID Blog RoomNum

Grades Social Sec. Num. Dept ID Course Number Section Year Term Grade