Method for recovering data in a storage system
    2.
    发明授权
    Method for recovering data in a storage system 有权
    在存储系统中恢复数据的方法

    公开(公告)号:US08108356B2

    公开(公告)日:2012-01-31

    申请号:US12208014

    申请日:2008-09-10

    IPC分类号: G06F7/00 G06F17/00

    摘要: In one aspect of the invention, there is disclosed a recovery method in a storage system that integrates shadow page and deferred update techniques. Updates of a page in the buffer are not immediately reflected to the database, but are deferred until the transaction is committed. Instead, the updated buffer page is stored in the log volume in the unit of a page. When reading a page that does not exist in the buffer from the disk, the up-to-date page from the database or from the log volume is read. Then the log table index is used to determine whether the up-to-date page exists in the database or in the log volume and to identify the position of the page stored in the log volume if the up-to-date page exists in the log volume.

    摘要翻译: 在本发明的一个方面,公开了一种集成阴影页面和延迟更新技术的存储系统中的恢复方法。 缓冲区中页面的更新不会立即反映到数据库中,而是延迟到事务提交之前。 相反,更新的缓冲区页面以页面为单位存储在日志卷中。 从磁盘读取缓冲区中不存在的页面时,将从数据库或日志卷读取最新页面。 然后,日志表索引用于确定数据库或日志卷中是否存在最新页面,并且如果最新页面存在于日志卷中,则标识存储在日志卷中的页面的位置 日志卷。