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1. 发明申请

US20050160315A1 Geographically distributed clusters 有权
标题翻译：地理分布式集群
公开(公告)号：US20050160315A1
公开(公告)日：2005-07-21
申请号：US10759894
申请日：2004-01-15
申请人： Sashikanth Chandrasekaran , William Kehoe
发明人： Sashikanth Chandrasekaran , William Kehoe
IPC分类号： G06F9/40 , G06F11/14 , G06F11/20 , G06F15/16
CPC分类号： G06F11/2079 , G06F11/1471 , G06F11/1474 , G06F11/2058 , G06F11/2069 , G06F11/2071 , G06F2201/80
摘要： A method and apparatus for mirroring data between a plurality of sites is provided. At a first site of the plurality of sites, a record is maintained that identifies which changes made to one or more data blocks that are stored at the first site have had associated redo information replicated to the other sites of the plurality of sites. A priority value associated with a transaction that is to be performed at the first site is determined. The transaction specifies a modification to a data block. Thereafter, if the priority value indicates that the transaction should not be lost if the first site becomes inoperable, then the transaction is committed only after the record indicates that all other changes that have updated the data block at the first site have had their respective redo information replicated to the other sites of the plurality of sites.
摘要翻译：提供了一种用于在多个站点之间镜像数据的方法和装置。在多个站点的第一站点处，维护记录，其识别对存储在第一站点处的一个或多个数据块所做的更改具有复制到多个站点中的其他站点的相关联的重做信息。确定与要在第一站点执行的事务相关联的优先级值。事务指定对数据块的修改。此后，如果优先级值指示如果第一站点变得不可操作，则不应丢失该事务，则仅在该记录指示在第一站点上更新了数据块的所有其它更改已经具有各自的重做之后才提交该事务信息复制到多个站点的其他站点。

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