Page recovery using volume snapshots and logs
    1.
    发明授权
    Page recovery using volume snapshots and logs 有权
    使用卷快照和日志进行页面恢复

    公开(公告)号:US07814057B2

    公开(公告)日:2010-10-12

    申请号:US11099021

    申请日:2005-04-05

    IPC分类号: G06F7/00

    摘要: Systems and methods are disclosed that facilitate providing page-level database restore functionality upon detection of a corruption event. Updates to a data page in a database can trigger generation of a snapshot of the data page, and an update log can be maintained that stores information related to page updates. Subsequent snapshots can be generated at predetermined intervals and can trigger truncation of a log segment and initiation of a new log segment. Upon detection of page corruption, a most-recent uncorrupt snapshot of the corrupt page can be identified, copied to the location of the corrupt page in the database, and modified according to the log segment associated with the uncorrupt snapshot to make the page current as of the corrupting event, all of which can be performed to restore the database without having to take the database offline.

    摘要翻译: 公开了在检测到腐败事件时便于提供页面级数据库恢复功能的系统和方法。 对数据库中的数据页的更新可以触发数据页快照的生成,并且可以维护存储与页面更新相关的信息的更新日志。 随后的快照可以以预定的间隔生成并且可以触发日志段的截断和新的日志段的启动。 在检测到页面损坏时,可以识别损坏的页面的最新的不破坏的快照,将其复制到数据库中的损坏页面的位置,并根据与非破坏快照关联的日志段进行修改,以使页面当前为 的破坏事件,所有这些都可以执行以恢复数据库,而不必使数据库脱机。