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Distributed database - Coggle Diagram

- - - - The sites use very similar software.
      - The sites use identical DBMS or DBMS from the same vendor.
      - Each site is aware of all other sites and cooperates with other sites to process user requests.
      - The database is accessed through a single interface as if it is a single database.
- - - - Different sites use dissimilar schemas and software.
      - The system may be composed of a variety of DBMSs like relational, network, hierarchical or object oriented.
      - Query processing is complex due to dissimilar schemas.
      - Transaction processing is complex due to dissimilar software.
      - A site may not be aware of other sites and so there is limited co-operation in processing user requests.