Research On Data Access And Integration Based On OGSA-DAI

With the development of internet and grid, much application system needs to use the distributed data. Not only are they stored in different medium, but also their expression is different. How to access and integrate them is to become the primary study for the grid. So, the open grid forum developed a grid middle ware OGSA-DAI. It can access many different data, for example, relation data, XML data, file and so on. It can also change the data into other type.First, this text makes an introduction about grid and deeply studies the XML and WebServices and GLOBUS. Secondly, it maked a deep research for the grid and expounds the component and system and mechanism for the OGSA-DAI in details.Finally, this text designs a new model to access and integrate distributed data making use of the virtue of the metadata and xml based on the OGSA-DAI. This text made a data accession and integration software depending on the model. Because it encapsulates data service resource information and database information and deployment of OGSA-DAI, so it can make a transparent accession for the distributed data and make it be more flexible and patulous. It also integrates the virtue of the model integration method and duplication integration method, and improves the performance using the XML technology.