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Ditributed databases, TYPES - 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.
- - - - A site may not be aware of other sites and so there is limited co-operation in processing user requests.
        
        Transaction processing is complex due to dissimilar software.
        
        Query processing is complex due to dissimilar schemas.
        
        The system may be composed of a variety of DBMSs like relational, network, hierarchical or object oriented.
        
        Different sites use dissimilar schemas and software.