网格环境下一种高效的元数据管理策略

A High-effect Metadata Management Strategy in Grid Environment

考虑到网格环境下传统元数据管理系统的不足和元数据本身的特点,根据局部性原理和本体论提出一种高效实用的基于虚拟组织(virtual organization i.e.VO)完全分布的元数据系统模型,在这个模型中每个分布元数据管理系统都采用SMICC(semantic metadata intelligent cache controller)体系结构,该体系结构根据局部性原理引入了智能Cache,并利用本体论表达语义信息来对元数据系统进行管理,智能Cache可以减少远程访问的时间,提高访问效率。根据语义信息来获得对概念的统一理解形式,过滤掉无关信息以缩小查询范围,并利用概念关联进行推理以实现对查询请求泛化,由此可以提高查询过程中查全率和查准率。

Considering the disadvantages of traditional metadata system and the characteristics ot metadata in Grid and according to the partial principle and ontology, a model of metadata system which adopts the completely distributed structure based on virtual organization （VO） was proposed. In the model, each metadata system adopts the architecture called SMICC （semantic metadata intelligent cache controller） ,which adopts an intelligent cache and semantic method to control the metadata system. With intelligent cache, SMICC can deal with different scenarios like splitting and merging of queries into subqueries for available metadata sets in local to reduce access time of remote queries. And with semantic information, SMICC can obtain the consistent concept of query, reduce the inquiry scope, and realize the extensive request of query based on concept connection, which can enhance precision and recall in inquiring process.