Homogeneous DDBMS – to define this, it will be necessary to know what a DDBMS. A DDBMS, full for Distributed Database management system is a software system that allows management of distributed databases and allows this management to be transparent to the users. A homogeneous DDBMS is an implementation where all sites make use of one product of database management system. One advantage of this is that it is easy to implement and allows incremental growth where new sites can be added to the sites with much ease. Heterogeneous DDBMS – in this setup, the database management system products are different in the various sites and their underlying data models are different too. In this setup, it is common to find underlying system to be composed of RDBMS, ORDBMS, and OODBMS.
