Research On Key Problem Of Grid Database

The Grid technology is the new generation network technology after Internet and Web, Which represent the technical development direction of existing network. Grid is an infrastructure of the national high performance calculation and the information service, its target is to connect various isomerous resources that the geography scatters up with each other, to gather and integrate a huge super computer. Grid is used to realize overall share of various resources. A great deal of data resources were accumulated in business application realm, which are mostly saving in various relation database, Further developing to make use of these huge data resources to make it the exert larger function will be a keystone of the Grid technology development.Firstly, background knowledge of the paper is described for example grid technology, grid database, Agent technology and so on, and in the paper research of grid database is discussed, then which is researched thorough. Aiming at the present state of the grid technology and database system, four schema of grid database, external architecture of grid database and function of grid database are put forwards, and aiming at the key technology of the grid database: Resources management, safety service, single sign-on, database access interface etc. is the certain research, the certain solution respectively is put forward.The grid database resources management system is the nuclear part of the whole grid database system, it includes several Agents and mobile Agent instance. These Agents and mobile agent realize querying state information of native resources, complete monitoring native resources information, querying remote resources information, registering and unregistering data provider information.Management Agent builds up a service request queue put each received service request into queue to wait following process. Each service request can be regarded as a task, these task present the different state every moment. The management Agent needs to manage the whole life cycle of these tasks. Adopting two phase submission protocol resolve the problem or the grid database in the distributed transaction process, follow the data of the modification, resume data to state before modification on the condition that computer crashes suddenly, program come error, data collide to cause the procedure interruption.The system capabilities mainly embody by capability of database access and data transfer. The paper puts forward the adopting reusing connection to improve the database access efficiency, adopting the second cache mechanism to combine with the grid FTP to improve the data...