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1. 发明授权

US06226650B1 Database synchronization and organization system and method 有权
标题翻译：数据库同步和组织系统及方法
公开(公告)号：US06226650B1
公开(公告)日：2001-05-01
申请号：US09156075
申请日：1998-09-17
申请人： Sameer S. Mahajan , Michael J. Donahoo , Shamkant B. Navathe , Mostafa H. Ammar , Frank H. McGeough , Sanjoy Malik
发明人： Sameer S. Mahajan , Michael J. Donahoo , Shamkant B. Navathe , Mostafa H. Ammar , Frank H. McGeough , Sanjoy Malik
IPC分类号： G06F1730
CPC分类号： G06F17/30575 , Y10S707/99952 , Y10S707/99953
摘要： The present invention provides a “data centric” approach to updating databases on computer systems of an intermittently connected database system. In this approach, the storage and processing complexity of the database server are de-coupled from the number of clients to be supported, thereby, improving the scalability of the server. Instead of focusing on the data required by individual clients, this method tracks changes to data subsets pertaining to groups of clients. Thus, the server need only track and record changes to these subsets of data, instead of tracking changes for individual clients. Clients download the subsets, which contain the data relevant to the group, and merges data or deletes superfluous data from the subsets. Since the server is tracking a limited set of data subsets related to groups of clients instead of the actual number of the clients, the overall scalability of the system is increased. In this system, client computer systems are synchronized with a server database by dividing data to be distributed from a server database into groups and assigning one or more of the groups to each client computer system. When a client computer system accesses the server, the client computer system sends changes made to its local database to the sever. The server updates its database with these changes. After making the updates to its database, the server determines which groups share in the changes made, and creates modification files for these groups. The clients download the modification files for the groups to which they are assigned.
摘要翻译：本发明提供了一种以数据为中心的方法来更新间歇连接的数据库系统的计算机系统上的数据库。在这种方法中，数据库服务器的存储和处理复杂性从要支持的客户端数量中解耦，从而提高了服务器的可扩展性。该方法不是专注于个别客户端所需的数据，而是跟踪与客户端组有关的数据子集的更改。因此，服务器只需跟踪和记录这些数据子集的更改，而不是跟踪单个客户端的更改。客户端下载包含与该组相关的数据的子集，并合并数据或从子集中删除多余的数据。由于服务器正在跟踪与客户端组相关的有限的一组数据子集，而不是客户端的实际数量，因此系统的整体可扩展性会增加。在该系统中，通过将从服务器数据库分发的数据分成组并将一个或多个组分配给每个客户端计算机系统，将客户端计算机系统与服务器数据库同步。当客户端计算机系统访问服务器时，客户端计算机系统将对其本地数据库的更改发送到服务器。服务器通过这些更改来更新其数据库。在对其数据库进行更新后，服务器确定所做更改中哪些组共享，并为这些组创建修改文件。客户端下载其分配到的组的修改文件。

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