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    • 5. 发明授权
    • Query access plan rebuilds
    • 查询访问计划重建
    • US07133861B2
    • 2006-11-07
    • US10727420
    • 2003-12-04
    • Paul Reuben DayBrian Robert MurasAnne Marie Ryg
    • Paul Reuben DayBrian Robert MurasAnne Marie Ryg
    • G06F7/00G06F17/00G06F17/30
    • G06F17/30463G06F17/30457Y10S707/99932Y10S707/99933Y10S707/99943
    • A method, apparatus and system that in an embodiment detect that a trigger exists, where the trigger indicates a potential need to rebuild a saved query access plan, and determine whether a previous job associated with the trigger created a new access plan that was identical to the saved access plan. If a previous job associated with the trigger has already created the new access plan and found that it was identical to the saved access plan, then the query is performed with the saved access plan, since there is no advantage to be gained by creating the new access plan again. In this way, multiple jobs are kept from repeatedly re-creating an access plan that is identical to one that already exists.
    • 在一个实施例中,检测到触发器存在的方法,装置和系统,其中触发器指示重建保存的查询访问计划的潜在需要,并且确定与触发相关联的先前作业是否创建了与触发器相同的新的访问计划 保存的访问计划。 如果与触发器相关联的先前作业已经创建了新的访问计划,并发现它与保存的访问计划相同,则使用保存的访问计划执行查询,因为创建新的访问计划没有任何好处 访问计划再次。 以这种方式,保留多个作业以重复重新创建与已经存在的访问计划相同的访问计划。
    • 6. 发明授权
    • Autonomically generating a query implementation that meets a defined performance specification
    • 自动生成满足定义的性能规范的查询实现
    • US09135298B2
    • 2015-09-15
    • US12107938
    • 2008-04-23
    • Paul Reuben DayBrian Robert MurasAnne Marie Ryg
    • Paul Reuben DayBrian Robert MurasAnne Marie Ryg
    • G06F17/30
    • G06F17/30433G06F17/30463
    • A database query optimizer allows specifying a performance specification for a query. When an access plan is created, the actual performance for executing the query using the access plan is determined and compared to the performance specification for the query. If the actual performance does not satisfy the performance specification for the query, the query optimizer autonomically generates a different access plan to see if the performance improves. If an access plan that meets the performance specification is generated, the new access plan is stored in the access plan cache for the query. If no access plan can be generated that meets the performance specification for the query, the access plan that provided the best performance is selected and stored in the access plan cache for the query.
    • 数据库查询优化器允许为查询指定性能规范。 当创建访问计划时,确定使用访问计划执行查询的实际性能,并将其与查询的性能规范进行比较。 如果实际性能不符合查询的性能规范,则查询优化器将自动生成不同的访问计划,以查看性能是否提高。 如果生成符合性能规范的访问计划,则新访问计划将存储在查询的访问计划缓存中。 如果不能生成满足查询性能规范的访问计划,则提供最佳性能的访问计划被选择并存储在查询的访问计划缓存中。
    • 8. 发明授权
    • Query directives and access plan hints
    • 查询指令和访问计划提示
    • US07685101B2
    • 2010-03-23
    • US12175036
    • 2008-07-17
    • Paul Reuben DayBrian Robert MurasAnne Marie Ryg
    • Paul Reuben DayBrian Robert MurasAnne Marie Ryg
    • G06F17/00
    • G06F17/30471G06F17/30306Y10S707/99932Y10S707/99934
    • A query plan modification system and method relate to a database system that includes a cost-based optimizer for generating access plans. The database system also permits a user to view an access plan that has been generated by a particular SQL query and modify the access plan if desired. The user specifies customizations that are associated with the access plan so that when that plan is executed, the customizations are executed as well. Exemplary customizations include specifying an initialization file specific to a query, specifying different implementation methods than those in the original access plan, prohibiting rebuilding of an access plan, and over-riding or ignoring a clause within the query that is used to generate the access plan.
    • 查询计划修改系统和方法涉及包括用于生成访问计划的基于成本的优化器的数据库系统。 数据库系统还允许用户查看由特定SQL查询生成的访问计划,并根据需要修改访问计划。 用户指定与访问计划相关联的自定义,以便在执行该计划时,还会执行自定义。 示例性定制包括指定特定于查询的初始化文件,指定与原始访问计划中的不同的实现方法,禁止重建访问计划,以及覆盖或忽略用于生成访问计划的查询内的子句 。