Between Heterogeneous Databases Based On The Xml Used In Combination

It is a lot of relevant sets of database systems to construct the heterogeneous database. It can realize sharing of data and transparentness for visit, each database system in join the heterogeneous database itself already existed, and has its own DMBS. Each part of the heterogeneous database has its own autonomy quality. At the time of realizing the data sharing, Each database system have its own application characteristic, the integrality control and the security control still.The merits and characteristic of XML-it has nothing to do with the platform,Easy to expand, its interaction is good, semanteme have stronger quality, and it can beformatted-make it ease to describe the heterogeneous database and realize theinter-convert between heterogeneous databases. Besides, through its own merits, itcan solve the problems-the deficient of union inquires about and optimizes, theintegration of heterogeneous database share based on WEB is not very mature, poor expanding-existing in heterogeneous database system at present partly.At first, this paper introduced the development and the problems existing in the heterogeneous database system at present, then recommend the role of XML in the heterogeneous database system, analysed the feasibilitying of realizing union use among heterogeneous database based on XML, and the advantage of XML in solve the problem of union use among heterogeneous database. On the foundation of this analysis, we propose one model frame based on XML to union use the heterogeneous database system. We narrates how to construct the systematic XML meta-data and realize the heterogeneous database's data convertion and transparent visiting in this thesis. At last, we expect the function of XML in the heterogeneous database systems and the trend of combination of them.