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In this paper we have proposed a new distributed data management system (DDMS) called DOT which provides high performance in an environment of high data mobility and heterogeneous host capabilities. The storage sites of DOT are divided in some groups where a group of client sites is under an administrator site. Intra group and inter group communications in DOT are maintained by peer-to-peer (P2P) connections. DOT follows decentralized-centralized communication architecture. Each client site of a group manages its data autonomously. Each administrator has a rule processing sub-system where rules are defined by high level language. The unit of data in the DOT system is fragment. Residence of a particular file fragments or replicas are not fixed in particular sites rather they can move in their own group. DOT ensures network bandwidth utilization, file location transparency, effective resource utilization …