Dbms 2
description
Transcript of Dbms 2
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