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1. 发明授权

US07036044B1 Identifying appropriate undo during a forward pass through a log 有权
标题翻译：在向前传递日志期间识别适当的撤消数据
公开(公告)号：US07036044B1
公开(公告)日：2006-04-25
申请号：US10295131
申请日：2002-11-15
申请人： Surendra Verma , Jonathan M. Cargille , Jacob P. Lacouture , Brian D. Andrew , Sameet H. Agarwal
发明人： Surendra Verma , Jonathan M. Cargille , Jacob P. Lacouture , Brian D. Andrew , Sameet H. Agarwal
IPC分类号： G06F11/00
CPC分类号： G06F11/1474 , G06F11/1471
摘要： 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.
摘要翻译：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。

2. 发明授权

US07181473B1 Identifying files within a namespace 有权
标题翻译：识别命名空间中的文件
公开(公告)号：US07181473B1
公开(公告)日：2007-02-20
申请号：US10293425
申请日：2002-11-12
申请人： Jacob P. Lacouture , Jonathan M. Cargille , Surendra Verma , Brian D. Andrew
发明人： Jacob P. Lacouture , Jonathan M. Cargille , Surendra Verma , Brian D. Andrew
IPC分类号： G06F17/30
CPC分类号： G06F17/30067 , Y10S707/99952 , Y10S707/99953
摘要： An external request to perform a file operation within a resource manager is received. The resource manager selects a resource manager file identifier that is to be an attribute of a file associated with the file operation. The file operation and the resource manager file identifier are logged in a log entry of a log. Subsequent to logging the log entry, the log entry is accessed during a forward pass through the log, for example, during a roll-forward recovery. If it is determined that the resource manager file identifier in the log entry is assigned to the file, the first log entry is not processed. On the other hand, if it is determined that the resource manager file identifier in the log entry is not assigned to the file, the resource manager file identifier is selected to be assigned to a file when the first log entry is processed.
摘要翻译：接收到在资源管理器内执行文件操作的外部请求。资源管理器选择要作为与文件操作相关联的文件的属性的资源管理器文件标识符。文件操作和资源管理器文件标识符记录在日志的日志条目中。在记录日志条目之后，在向前传递日志期间访问日志条目，例如在前滚恢复期间。如果确定日志条目中的资源管理器文件标识符被分配给该文件，则不处理第一个日志条目。另一方面，如果确定日志条目中的资源管理器文件标识符未被分配给文件，则当处理第一个日志条目时，选择资源管理器文件标识符被分配给文件。

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