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    • 46. 发明授权
    • Optimizing storage allocation
    • 优化存储分配
    • US08799267B2
    • 2014-08-05
    • US11778122
    • 2007-07-16
    • Gregory Howard MilbyJohn Mark Morris
    • Gregory Howard MilbyJohn Mark Morris
    • G06F17/30G06F3/06
    • G06F3/0631G06F3/0613G06F3/067
    • There is provided a method, a system and a machine readable medium to optimize storage allocation in a database management system. The method comprises receiving a processing step at a step processing module of an access module processor from a dispatcher module. The method further comprises determining whether a fast access storage flag is set in the processing step, the fast access storage flag indicating use of an intermediate file in fast access storage to store one or more redistributed data rows of a table of a database that is distributed across one or more storage devices of the database management system; Yet further the method comprises selectively allocating a free fast access storage data block to the intermediate file from a fast access storage pool based on the determination that the fast access storage flag is set. Lastly, the method comprises writing a redistributed data row from the one or more redistributed data rows to the allocated fast access storage data block.
    • 提供了一种用于优化数据库管理系统中的存储分配的方法,系统和机器可读介质。 该方法包括在调度器模块的接入模块处理器的步骤处理模块处接收处理步骤。 该方法还包括确定在处理步骤中是否设置了快速访问存储标志,指示快速访问存储器中的中间文件的使用的快速访问存储标志,以存储分发的数据库的表的一个或多个重新分发的数据行 跨越数据库管理系统的一个或多个存储设备; 此外,该方法包括基于快速访问存储标志被设置的确定,从快速访问存储池向中间文件选择性地分配空闲快速访问存储数据块。 最后,该方法包括将重分布的数据行从一个或多个重新分发的数据行写入到所分配的快速存取存储数据块。
    • 48. 发明授权
    • Identifying database request sources in multi-database systems
    • 在多数据库系统中识别数据库请求源
    • US08527473B1
    • 2013-09-03
    • US12344991
    • 2008-12-29
    • Douglas P. BrownJohn Mark MorrisAnita Richards
    • Douglas P. BrownJohn Mark MorrisAnita Richards
    • G06F7/00G06F17/00
    • G06F17/30557
    • Recovering from a failure of a soon-to-fail database system among a plurality of database systems in a multi-database system in processing a request submitted to the multi-database system through a multi-database system session is accomplished. A query band is created for the request. The query band is defined to be an identifier that uniquely identifies the session and the request among the plurality of sessions and plurality of requests being processed by the multi-database system at the time that the request was submitted. The query band is attached to a transaction issued by the multi-database system to the soon-to-fail database system to execute the query. The status concerning execution of the transaction is reported by the soon-to-fail database system. The status includes the query band. The status is logged. The failure of the soon-to-fail database system is detected. The state of the soon-to-fail database system is reconstructed from the logged status as the state related to the processing of the transaction using the query band. The reconstructed state is used to continue processing of the transaction by an alternative database system. The alternative database system is one of the plurality of database systems in the multi-database system. The request is processed to produce a result and the result is stored.
    • 在处理通过多数据库系统会话提交给多数据库系统的请求的多数据库系统中的多个数据库系统中,从即将到失败的数据库系统的故障中恢复。 为请求创建查询带。 查询频带被定义为在提交请求时唯一标识会话和多个会话中的请求以及由多数据库系统处理的多个请求的标识符。 查询带附加到由多数据库系统发出的事务到即将到失败的数据库系统以执行查询。 关于执行事务的状态由即将到来的数据库系统报告。 状态包括查询带。 状态被记录。 检测到即将失败的数据库系统的故障。 即将到失败的数据库系统的状态从记录状态重建为与使用查询带处理事务相关的状态。 重建状态用于通过替代数据库系统继续处理事务。 替代数据库系统是多数据库系统中的多个数据库系统之一。 处理该请求以产生结果并存储结果。