Distributed Database Management Systems: Lecture 2

Distributed Database Management Systems: Lecture 2. The main topics covered in this chapter include: introduction to distributed databases; major characteristics; data at multiple sites; DM at each site ind; local requirements; global perspective;...

Distributed database  Management Systems Lecture 02 Virtual University of Pakistan In the previous lecture …… In today’s lecture – Introduction to Distributed Databases – Major characteristics – Objective of today’s lecture is … Virtual University of Pakistan Distributed DB  and DBMS Virtual University of Pakistan Distributed Database: A collection of  logically interrelated databases that are  spread physically across multiple  locations connected by a data  communications link Virtual University of Pakistan Main Characteristics Data at multiple sites DM at each site ind Local requirements Global perspective Virtual University of Pakistan Where to apply Major two reasons that make an  application a candidate to be DDBS  application Large Number of Users Operation spread large geographical  area Virtual University of Pakistan Example Applications Banking Air Ticketing Business at multiple locations Virtual University of Pakistan Distributed DBMS: A software system that  permits the management of DDB and  makes the distrib. transparent to the users Decentralized Database: A collection of  independent databases on non­networked  computers Virtual University of Pakistan Thanks Virtual University of Pakistan ...In the previous? ?lecture? ?…… In today’s? ?lecture – Introduction to? ?Distributed? ?Databases – Major characteristics – Objective of today’s? ?lecture? ?is … Virtual University of Pakistan Distributed? ?DB ... Virtual University of Pakistan Distributed? ?DBMS: A software system that  permits the? ?management? ?of DDB and  makes the distrib. transparent to the users Decentralized? ?Database:  A collection of  independent databases on non­networked ... Virtual University of Pakistan Distributed? ?DB  and DBMS Virtual University of Pakistan Distributed? ?Database:  A collection of  logically interrelated databases that are  spread physically across multiple  locations connected by a data