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    • 3. 发明申请
    • Asynchronous peer-to-peer data replication
    • 异步对等数据复制
    • US20050193024A1
    • 2005-09-01
    • US10788556
    • 2004-02-27
    • Kevin BeyerElizabeth HamelBruce LindsayClarence Pruet
    • Kevin BeyerElizabeth HamelBruce LindsayClarence Pruet
    • G06F7/00G06F17/30
    • G06F17/30566G06F17/30286G06F17/30578
    • A method and system for providing convergence of data copies in asynchronous data replication in a database system, includes: labeling rows of a plurality of table copies with a monotonic number, a copy identification, and propagation controls; asynchronously capturing at least one labeled change to any row of any of the plurality of table copies from a database recovery log; determining that the captured change is to be communicated to others of the plurality of table copies; communicating the captured change to the others of the plurality of table copies; and applying the communicated change to the others of the plurality of table copies, where the plurality of table copies converge to a same state. In applying the communicated changes, conflicting changes are identified and resolved. In this manner, convergence of data copies in asynchronous data replication is provided, and processing and storage costs are significantly reduced.
    • 一种用于在数据库系统中异步数据复制中提供数据副本的收敛的方法和系统,包括:用单调数,复制标识和传播控制标记多个表副本的行; 从数据库恢复日志中异步地将至少一个标记的更改捕获到多个表副本中的任一个的任何行的任何行; 确定所捕获的改变将被传送到所述多个表副本中的其他人; 将所捕获的改变传达给所述多个表格副本中的其他更改; 以及将所传送的改变应用于所述多个表副本中的其他表,其中所述多个表副本收敛到相同的状态。 在应用传达的更改时,会发现和解决冲突的变化。 以这种方式,提供异步数据复制中的数据副本的收敛,并且显着地减少处理和存储成本。
    • 9. 发明申请
    • METHOD AND APPARATUS FOR REPLICATING DATA ACROSS MULTIPLE COPIES OF A TABLE IN A DATABASE SYSTEM
    • 用于在数据库系统中复制表的多个复制数据的方法和装置
    • US20070288537A1
    • 2007-12-13
    • US11771801
    • 2007-06-29
    • Serge BOURBONNAISElizabeth HamelBruce LindsayStephen Todd
    • Serge BOURBONNAISElizabeth HamelBruce LindsayStephen Todd
    • G06F12/00
    • G06F17/30578G06F17/30345Y10S707/99938
    • A method for handling transaction messages in asynchronous data replication in a database system, in which the database system includes a source node and a target node, and each transaction message has information concerning a row change to a table copy at the source node. The method includes determining whether a first transaction message has a dependency on a preceding non-completed transaction message. Responsive to the first transaction message having a dependency on the preceding non-completed transaction, the method further includes holding the first transaction message, completing the preceding non-completed transaction message including applying the row change associated with the preceding non-completed transaction message to the table copy at the target node, and responsive to completing the preceding non-completed transaction message, releasing the first transaction message and applying the row change associated with the first transaction message to the table copy at the target node.
    • 一种用于在数据库系统中处理异步数据复制中的事务消息的方法,其中数据库系统包括源节点和目标节点,并且每个事务消息具有关于在源节点处的表副本的行更改的信息。 该方法包括确定第一交易消息是否具有对先前未完成的交易消息的依赖性。 响应于对先前未完成的交易具有依赖性的第一交易消息,该方法还包括保存第一交易消息,完成前述未完成交易消息,包括将与先前未完成的交易消息相关联的行变更应用于 在目标节点处的表副本,并且响应于完成上述未完成的交易消息,释放第一交易消息并将与第一交易消息相关联的行变更应用于目标节点处的表副本。
    • 10. 发明申请
    • Cart with precision steering for transporting materials
    • 带精密转向的车载运输材料
    • US20070085285A1
    • 2007-04-19
    • US11253512
    • 2005-10-19
    • Bruce Lindsay
    • Bruce Lindsay
    • B62B3/00
    • B62B3/001B62B5/065
    • A cart with a manually operated steering mechanism comprising a base coupled to a frame and a cart body with a steering column and steering mechanism. The base further comprises several mechanical steering linkages including a steering push rod, push rod slat, and tie rod; a rack and gear assembly where the gear is coupled to the steering column and the rack is coupled to the steering push rod; and a rack and pinion assembly where the rack is coupled to the tie rod and the pinion is coupled to a pinion shaft whereby a first end engages the rack and a second end is coupled to the steering column through a miter gear assembly. The mechanical linkages are supported by and coupled to the base by support braces and the steering column also capable of being telescopically adjustable.
    • 具有手动操作的转向机构的推车包括联接到框架的底座和具有转向柱和转向机构的推车主体。 基座还包括几个机械转向连杆,包括转向推杆,推杆板条和拉杆; 齿轮和齿轮组件,其中齿轮联接到转向柱并且齿条联接到转向推杆; 以及齿条和小齿轮组件,其中齿条联接到拉杆并且小齿轮联接到小齿轮轴,由此第一端接合齿条,并且第二端通过斜切齿轮组件联接到转向柱。 机械连杆由支撑支架支撑并连接到底座,转向柱还能够可伸缩地调节。