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Investigation of improvements in distribution , replication and security of Dynamic XML Documents

The power of distribution and replication has been harnessed since long to provide potential advantages of improved performance, reduced costs, improved reliability and shorter response times. Recently, these powers have been introduced for dynamic XML documents as new features. It is supported by Query languages like Xpath and Xquery and large network of systems provided by the Internet. The autonomy of peers to distribute data over large-scale system requires a proper framework that can guarantee that the document structure is not violated. The goal of this paper is to propose a proper unit of fragmentation for the AXML documents, so that the document remains valid while it is distributed and replicated. To address the communication cost and performance related issues, we propose an optimized query processing strategy while data is distributed and replicated over different peers using semi-join operation. A more secured and reliable security model in distributed environment has also been proposed.