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Distributed Database System (DDBS)
- The database is divided into a number of cooperating databases each located at a separate site.
- Users of the database at any site are allowed to access both locally and remotely stored data
DDBS vs Centralized Database System
- Increased reliability since data is spread over several sites
- Improved transaction processing times
- Reduced saturation since the communication traffic is distributed
- Modularity eases maintenance and upgrading
Four advantages
Parameters of DDBS Design
1. Volume and activity of database
2. Number of hosts/sites
3. Storage facilities at sites
4. Channel Capacity
5. Cost Factor
Five things to consider when implementing a DDBS
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