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;...
Trang 1Distributed database Management Systems
Lecture 02
Trang 2In today’s lecture
– Introduction to Distributed Databases – Major characteristics
– Objective of today’s lecture is …
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Distributed DB
and DBMS
Trang 4Distributed Database: A collection of
logically interrelated databases that are spread physically across multiple
locations connected by a data
communications link.
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Main Characteristics
Data at multiple sites
DM at each site ind
Local requirements
Global perspective
Trang 6Major two reasons that make an
application a candidate to be DDBS application
Large Number of Users
Operation spread large geographical
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Example Applications
Banking
Air Ticketing
Business at multiple locations
Trang 8Distributed 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.
Trang 9Thanks