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    • 2. 发明授权
    • Method and system for supporting multivalue attributes in a database system
    • 在数据库系统中支持多值属性的方法和系统
    • US07409401B2
    • 2008-08-05
    • US11064737
    • 2005-02-23
    • Lynda A. HansenThomas S. LeeMayank V. Shah
    • Lynda A. HansenThomas S. LeeMayank V. Shah
    • G06F17/00
    • G06F17/30321Y10S707/99942Y10S707/99943Y10S707/99944Y10S707/99945
    • A method and system for supporting multivalue attributes in a database system is disclosed. The method and system includes defining an index class by designating a plurality of attributes associated with the index class, wherein the plurality of attributes includes single value attributes and at least one multivalue attribute, generating an attribute value table for the index class for storing attribute values for the single value attributes, and generating a multiple value table for each of the at least one multivalue attributes for storing attribute values for the at least one multivalue attributes.By generating the multiple value table for the multivalue attribute, each row in the multiple value table corresponds to a single value of the multivalue attribute of the index class. Accordingly, an index scan can be performed to retrieve or update data corresponding to the associated multivalue attribute. Thus, data management becomes more efficient and less costly.
    • 公开了一种在数据库系统中支持多值属性的方法和系统。 所述方法和系统包括通过指定与所述索引类相关联的多个属性来定义索引类,其中所述多个属性包括单值属性和至少一个多值属性,为所述索引类生成用于存储属性值的属性值表 并且为所述至少一个多值属性中的每一个生成用于存储所述至少一个多值属性的属性值的多值表。 通过生成多值属性的多值表,多值表中的每一行对应于索引类的多值属性的单个值。 因此,可以执行索引扫描以检索或更新与相关联的多值属性相对应的数据。 因此,数据管理变得更加高效,成本更低。
    • 9. 发明授权
    • Distributed storage management system having a cache server and method
therefor
    • 具有缓存服务器的分布式存储管理系统及其方法
    • US5940594A
    • 1999-08-17
    • US902285
    • 1997-07-29
    • Seifu AliThomas G. BurketTawei HuGerald Edward KozinaThomas S. Lee
    • Seifu AliThomas G. BurketTawei HuGerald Edward KozinaThomas S. Lee
    • G06F17/30G06F15/00
    • G06F17/30067
    • The present invention is directed to a method and system for storing and managing objects, such as binary large objects (blobs) in a digital library system which includes a plurality of clients, an object server for storing an object, a cache server for storing an copy of the object, and a centralized server for storing information identifying the object as being stored in the object server and associating one or more of the clients with the cache server, in which one of the clients, as a requesting client, requests retrieval of an object, a copy of the requested object is sent from the cache server to the requesting client if the object is stored in said cache server, and a copy of said object is sent from the object server to said requesting client if the object is not stored in the cache server; and a copy of the requested object is sent from the object server to the cache server after the object server sends the object to the client, in which the object sent to the client is made available to the client regardless of whether sending of the copy of the object to the cache server is completed.
    • 本发明涉及一种用于在数字图书馆系统中存储和管理诸如二进制大对象(blob)的对象的方法和系统,该数字图书馆系统包括多个客户端,用于存储对象的对象服务器,用于存储对象的高速缓存服务器 对象的副本以及用于存储标识被存储在对象服务器中的对象的信息并将一个或多个客户端与高速缓存服务器相关联的集中式服务器,其中作为请求客户端的客户端之一请求检索 如果对象存储在所述缓存服务器中,则所请求对象的副本从缓存服务器发送到请求客户端,并且如果对象不是,则将对象服务器的副本从对象服务器发送到所述请求客户端 存储在缓存服务器中; 并且在对象服务器将对象发送到客户端之后,将所请求的对象的副本从对象服务器发送到缓存服务器,其中发送给客户端的对象可用于客户端,而不管是否发送副本 缓存服务器的对象完成。