【作者】 李巍；

【导师】 李冠宇；

【作者基本信息】 大连海事大学 ， 计算机应用技术， 2005， 硕士

【摘要】 当今世界的信息总量已经大大地超乎人们的想象,达到了一个十分惊人的数字,与此同时信息的膨胀速度还在不断的加快,人们几乎已经被信息的海洋所淹没。虽然信息技术的出现,为人类管理和使用海量信息提供了一个有效的途径,但是,信息技术的不断发展也产生了诸多的异构问题(如平台异构、数据格式异构等等)信SORE正是我们自行研发的一个解决异构数据集成问题的原型系统,然而,在异构数据的元数据存储和数据资源的有效利用方面所作的工作还很少,这极大的影响了系统的效率和异构数据的集成能力。 本文通过对数据集成系统(包括物化集成系统和虚拟集成系统)的研究,在元数据管理和缓存数据处理两方面得到了一定的启发,因此从数据存储的角度对SORE原型系统进行完善,其中包括元数据服务和客户端语义缓存服务两个方面。元数据服务主要是通过对MOF规范的研究实现了基于MOF的异构数据元数据的管理和存储。在数据缓存研究方面,主要是通过对移动计算环境下的语义缓存的研究,提出了适用于异构数据环境下的语义缓存模型、缓存数据的组织策略和查询处理方法,并在客户端实现了查询结果的语义缓存。更多还原

【Abstract】 It was incogitable for people to know the gross amount of information in the world, which was up to a surprising quantity. At the same time the pace of information increasing was still quickening, so that people were almost submerged in the sea of information. Athough information technology offered a effective way to solve the problem of management and utilization of mass information, with the development in IT there appeared some heterogeneous problems, such as heterogeneous platform, heterogeneous data format ect. SORE developed by us was a protype system to solve the problem of heterogeneous data integration. Howerer, little work had been done at the metadata of heterogeneous data and the effective utilization of resource, which had a negative effect on system efficiency and capacity of integrating heterogeneous data.In the thesis through the research of data integration systems we got some illumination about metadata management and caching treating. Thus we designed the metadata service and the semantic caching in a client at the aspect of data storage to improve SORE. Metadata service implemented the MOF based metadata management and storage of heterogeneous data through the research of MOF criterion. On the research of semantic caching we presented the semantic cache model, the method of oganization and query treating of data cached and implemented the semantic caching of query results in a client.更多还原