Abstract: The Distributed and Heterogeneous Data Buffer(BHDB) is an important part of multi-database middleware.This paper discusses data consistency management of the system,improves the traditional technology,and lucubrates the data replication strategy,local data source’s plug-and-play mechanism,data namespace and system security management,which are the key technologies and the basis of the system realization.

Key words: multi-database middleware； distributed and heterogeneous data buffer system； data consistency management； data replication strategy； local data source’s plug-and-play；