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    • 4. 发明授权
    • Pre-fetching of pages prior to a hard page fault sequence
    • 在硬页错误序列之前预取页面
    • US06317818B1
    • 2001-11-13
    • US09282499
    • 1999-03-30
    • Arthur ZwiegincewJames E. Walsh
    • Arthur ZwiegincewJames E. Walsh
    • G06F1200
    • G06F12/08G06F2212/401
    • Hard page fault patterns of an application program module are analyzed in order to determine the pages that will be retrieved from disk storage during a common hard page fault scenario. Copies of, or references to, the determined pages are stored in a scenario file, along with an index referred to as a page sequence. The scenario file may also include a prologue indicating events that lead to a hard page fault scenario and an epilogue that may indicate subsequent hard page fault scenarios. Execution of the application program module is monitored to detect the occurrence of a hard page fault scenario. When a hard page fault scenario is detected, a corresponding scenario file is fetched from disk storage and the determined pages, or copies thereof, are transferred into RAM. The determined pages, or copies thereof, may be placed on a stand-by list in RAM and later soft-faulted into the working set of the application program upon request by the application program module, thereby avoiding a sequence of hard page faults.
    • 分析应用程序模块的硬页错误模式,以确定在常见硬页错误情况下将从磁盘存储器检索的页面。 将确定的页面的副本或引用存储在脚本文件中,以及被称为页面序列的索引。 场景文件还可以包括指示导致硬页错误情况的事件的序言,以及可指示后续硬页错误情景的结尾语。 监控应用程序模块的执行情况,以检测硬页错误情况的发生。 当检测到硬页面故障场景时,从磁盘存储器取出相应的场景文件,并将确定的页面或其副本传送到RAM中。 确定的页面或其副本可以被放置在RAM中的备用列表上,并且随后由应用程序模块请求而被软错误地发送到应用程序的工作集合中,从而避免了一系列的硬页错误。
    • 10. 发明授权
    • Converting expressions to execution plans
    • 将表达式转换为执行计划
    • US07283996B2
    • 2007-10-16
    • US11050177
    • 2005-02-02
    • Eugene N. NonkoMark H. LucovskyArthur ZwiegincewShaun D. Pierce
    • Eugene N. NonkoMark H. LucovskyArthur ZwiegincewShaun D. Pierce
    • G06F17/30
    • G06F17/30427G06F17/30442Y10S707/99931Y10S707/99933Y10S707/99934Y10S707/99935Y10S707/99945
    • Methods, systems, and computer program products for converting a single expression referencing multiple branches within a hierarchical schema into multiple expressions referencing a single branch of the hierarchical schema. The single expression includes expression components that identify branches within the hierarchical schema. Relative to a given branch, any branches referenced by a given expression component are identified. The identified branches are stored as new branches. If no branch is identified, the current branch may be removed as inconsistent. Storage for current branches is cleared, the new branches are copied to the current branches, and the process is repeated for each expression component. An expression component may include a predicate for determining which branches are referenced. The predicate may include predicate expressions that are converted to predicate branches and the predicate may include predicate operators. Predicate operators are combined with predicate branches to identify all branches referenced by the predicate.
    • 用于将引用分层模式中的多个分支的单个表达式转换为引用分层模式的单个分支的多个表达式的方法,系统和计算机程序产品。 单个表达式包含标识分层模式中的分支的表达式组件。 相对于给定的分支,给定表达式组件引用的任何分支都被识别。 识别的分支存储为新分支。 如果没有分支被识别,则当前分支可能被删除为不一致。 清除当前分支的存储,将新分支复制到当前分支,并为每个表达组件重复进程。 表达组件可以包括用于确定哪些分支被引用的谓词。 谓词可以包括转换为谓词分支的谓词表达式,谓词可以包括谓词运算符。 谓词运算符与谓词分支组合,以标识由谓词引用的所有分支。