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    • 8. 发明授权
    • Data management system, primary server, and secondary server for data registration and retrieval in distributed environment
    • 数据管理系统,主服务器和辅助服务器,用于分布式环境中的数据注册和检索
    • US06212521B1
    • 2001-04-03
    • US09049551
    • 1998-03-27
    • Shinji MinamiMasaaki WakamotoMitsuaki Kakemizu
    • Shinji MinamiMasaaki WakamotoMitsuaki Kakemizu
    • G06F1730
    • G06F17/30949Y10S707/955Y10S707/959Y10S707/99931Y10S707/99933Y10S707/99953
    • A data management system that allows client terminals on a network to register records with search keywords to distributed data management servers and to retrieve them by entering a specific search keyword. The entire coverage area of the network is divided into a plurality of primary areas, and each primary area is further subdivided into a plurality of secondary areas. Primary and secondary servers are deployed over the network, one for each individual primary area and secondary area, respectively. The primary servers employ a primary hash function that processes a given search keyword to derive a primary server identifier indicating one of the primary servers that governs a particular primary area where the secondary server having a record relevant to the given search keyword is located. Further, the primary servers have a secondary hash function that processes a given search keyword to derive a specific secondary server identifier indicating one of the secondary servers that is located in the same primary area as their own and has a record relevant to the given search keyword. The secondary servers are also equipped with the same secondary hash function as the primary servers'. Those two hash functions are used in both data registration and data retrieval processes.
    • 一种数据管理系统,允许网络上的客户端通过搜索关键字向分布式数据管理服务器注册记录,并通过输入特定的搜索关键字来检索它们。 网络的整个覆盖区域被分成多个主要区域,并且每个主要区域进一步细分为多个次要区域。 主服务器和辅助服务器分别部署在网络上,分别针对每个主要区域和次要区域。 主服务器使用主哈希函数来处理给定的搜索关键字以导出主服务器标识符,其指示管理特定主要区域的主服务器之一,其中辅助服务器具有与给定搜索关键字相关的记录所在的主服务器标识符。 此外,主服务器具有辅助散列函数,其处理给定搜索关键字以导出指示与其自身位于相同主区域中的辅助服务器之一的特定辅助服务器标识符,并具有与给定搜索关键字相关的记录 。 辅助服务器还具有与主服务器相同的辅助散列功能。 这两个哈希函数都用于数据注册和数据检索过程。