Distributed DB and DBMS
Distributed Database: A collection of logically interrelated databases that are spread physically across multiple locations connected by a data communications link.
Main Characteristics
- Data at multiple sites
- DM at each site ind.
- Local requirements
- Global perspective
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
Example Applications
- Banking
- Air Ticketing
- Business at multiple locations
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 non-networked computers.
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