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    • 10. 发明授权
    • System for data structure loading with concurrent image copy
    • 用于并行映像副本的数据结构加载系统
    • US6038569A
    • 2000-03-14
    • US798532
    • 1997-02-10
    • Thomas Abel BeavinJohn Marland GarthLaura Michiko Kunioka-WeisJames Zu-Chia Teng
    • Thomas Abel BeavinJohn Marland GarthLaura Michiko Kunioka-WeisJames Zu-Chia Teng
    • G06F17/30
    • G06F17/30315Y10S707/915Y10S707/99937Y10S707/99943Y10S707/99945Y10S707/99954
    • Data is loaded to a data structure while an image copy of the data structure is concurrently formed. After data records are obtained from one or more data sources, each of the data records is associated with one of multiple pages. As each page is completed, it is written to a primary data structure. Also upon completion of each page in the primary data structure, concurrently with storage of the page in the primary data structure, an image copy of the page is made in an image copy data set. Partially or completely failed primary data structures may also be restored using image copies made according to the invention. Timestamps mark the time at which each page are made; image copy pages include the same timestamp as their respective primary pages. Upon detecting a data structure failure, each page of the image copy is sequentially reviewed. For each image page being reviewed, the page's timestamp is compared with the timestamp of the corresponding page from the primary data structure. The page is copied from the image copy to the primary data structure only if the timestamp comparison indicates that the image page is more recent than the page from the primary data structure.
    • 数据被加载到数据结构,同时形成数据结构的图像副本。 在从一个或多个数据源获得数据记录之后,每个数据记录与多个页面之一相关联。 当每个页面完成时,它被写入主数据结构。 此外,在主数据结构中的每个页面完成时,与主数据结构中的页面的存储同时,在图像复制数据集中进行页面的图像副本。 也可以使用根据本发明制造的图像副本来恢复部分或完全失败的主数据结构。 时间戳标记每个页面的时间; 图像复制页面包含与其各自的主页面相同的时间戳。 在检测到数据结构故障时,依次审查图像副本的每一页。 对于正在审核的每个图像页面,将页面的时间戳与主数据结构中相应页面的时间戳进行比较。 只有当时间戳比较指示图像页面比主数据结构中的页面更新时,页面才从图像副本复制到主数据结构。