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    • 7. 发明授权
    • Identifying appropriate undo during a forward pass through a log
    • 在向前传递日志期间识别适当的撤消数据
    • US07036044B1
    • 2006-04-25
    • US10295131
    • 2002-11-15
    • Surendra VermaJonathan M. CargilleJacob P. LacoutureBrian D. AndrewSameet H. Agarwal
    • Surendra VermaJonathan M. CargilleJacob P. LacoutureBrian D. AndrewSameet H. Agarwal
    • G06F11/00
    • G06F11/1474G06F11/1471
    • The location of appropriate undo data necessary for reversing an effect of an operation performed at a computer system is identified during a forward pass through a log. A cycle count can be used to determine if appropriate undo data is stored in an object or is stored in auxiliary storage. If appropriate undo data is stored in an object and the undo data would be potentially lost by processing a redo log entry to modify the contents of the object, the appropriate undo data is copied to auxiliary storage. In some embodiments, a secondary computer system receives log entries from a primary computer system. The secondary computer system can identify undo data necessary to reverse an effect of an operation performed at the secondary computer system from received log entries. Identified undo data can be copied auxiliary storage at the secondary computer system.
    • 在向前传递日志期间识别用于反转在计算机系统执行的操作的效果所需的适当的撤销数据的位置。 可以使用循环计数来确定适当的撤消数据是存储在对象中还是存储在辅助存储器中。 如果适当的撤消数据存储在对象中,并且通过处理重做日志条目来修改对象的内容可能会丢失撤消数据,则将相应的撤消数据复制到辅助存储。 在一些实施例中,辅助计算机系统从主计算机系统接收日志条目。 辅助计算机系统可以识别从接收的日志条目反转在次计算机系统执行的操作的影响所需的撤销数据。 识别的撤消数据可以复制到辅助计算机系统的辅助存储器。