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    • 67. 发明授权
    • System and methods for data field management in a computer database
system
    • 计算机数据库系统中数据字段管理的系统和方法
    • US5561793A
    • 1996-10-01
    • US109033
    • 1993-08-18
    • John G. BennettSteven T. ShaughnessyChristopher W. Brumme
    • John G. BennettSteven T. ShaughnessyChristopher W. Brumme
    • G06F17/30
    • G06F17/30171Y10S707/99932Y10S707/99938Y10S707/99952Y10S707/99956
    • A system of the present invention includes a relational database management system (RDBMS). Methods are described for maintaining integrity between "design documents," which may be creating under different operating systems, and one or more information tables of the system. The system provides each field of a table with a unique ID ("field ID") for tracking the field regardless of restructuring changes which may be made to the table by various clients. Corresponding field IDs are stored with the fields of design documents, thereby permitting the system to maintain a link between a design document and its table. Upon a restructure of a table, the dependent design documents may be appropriately updated by their respective clients. Methods are also described for improved storage of free-form or "memo" data. In a preferred embodiment, memo data are stored in a separate file comprised of variable-length storage blocks. Methods are described for allocating storage space in the blocks and sub-allocating storage space within a block. For increased efficiency, the system maintains a sorted "free list" of free storage blocks.
    • 本发明的系统包括关系数据库管理系统(RDBMS)。 描述了用于维护可能在不同操作系统下创建的“设计文档”和系统的一个或多个信息表之间的完整性的方法。 系统为表的每个字段提供唯一的ID(“字段ID”),用于跟踪字段,而不管可能由各种客户端对表进行的重组更改。 对应的字段ID与设计文档的字段一起存储,从而允许系统维护设计文档与其表之间的链接。 在重组表格后,依赖的设计文件可以由其各自的客户端适当更新。 还描述了改进存储自由形式或“备忘录”数据的方法。 在优选实施例中,备忘录数据存储在由可变长度存储块组成的单独文件中。 描述了用于在块中分配存储空间并在块内分配存储空间的方法。 为了提高效率,系统维护免费存储块的排序“空闲列表”。