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Characteristics of a Distributed Database Management System - DDBMS


A Distributed DBMS may have a number of local applications, but it has at least one global application. Thus, a distributed DBMS has the following features:

1) A distributed DBMS is a collection of logically related shared data.

2) The data in a distributed DBMS is split into a number of fragments or partitions.

3) Fragments may be replicated in a distributed system.

4) Fragments/replicas are allocated to different sites.

5) In a distributed system, the sites are linked by communications network.

6) The data at each site is under the control of a DBMS.  

7) The DBMS at each site has its own right, that is, it can handle local applications independently.

8) Each DBMS in a distributed system participates in at least one global application.