Research On Native XML Database Storing

With the growing popularity and application of XML related standards, large repositories of XML documents have emerged on the Web. It is necessary to store these documents into a database to make them manageable. Storage schemes have become an important research topic in the XML data management field. Native XML database could take into account the characteristics of XML data fully, deal with the XML data in a natural way, support storage and query well in all aspects, and achieve good results. Therefore, the native XML database storage means a great deal of research value.This thesis is based on acknowledge of XML and relation database, and researches deeply the storing method of Native XML Database. But Current storage method is not good at storaging data of XML in the time and space, meanwhile they can not support High-performance update, and so on. Based on the viewpoint mentioned above, this thesis brings forward a uniform access strategy (WNXD), WNXD is a tentative exploration to the mechanism research in access to the unstructured information. Mainly includes techniques and theories as follows: The combination of the records-based storage model with the pages-based to ensure the efficiency and integrality of the data retrieval for all sorts of heterogeneous and context mixed data to the fullest extent, and reduce the I/O number; Dynamically inverted and merging combined with the data mapping mechanism, supports the XML document efficiently and can improve the operation capability of the system to some extent; Combine the characteristics of XML, a new storage model for the provision of XML data query and update operations to better support; The definition of three indexes(table of retrieval, table of page and value table)provides a multilevel access strategy for XML data from all the document to the partial and then to the element.In this paper, procedures WNXD storage strategy implementation, and performance compared with success Native XML DataBase in today's, at last. The results show that the WNXD has better performance compared with the classical method.