问题引入 SQL Server 数据库查询优化器对执行计划成本的评估是基于统计信息的，换句话说，统计信息的准确与否直接关系着查询语句是否能够高效运行。那么，在SQL Server中，表对象中统计信息的缺失是一个影响查询语句性能的风险点，我们如何能够通过非常自动化的方式来侦查，发现统计信息的缺失呢？这个问题的答案就是我们今天这篇文章要分享的内容－使用执行计划缓存来发现统计信息的缺失警告。关于统....

文章 2017-08-29 来自：开发者社区

RDS SQL Server - 专题分享 - 巧用执行计划缓存之Table Scan

背景引入执行计划中的Table Scan或者是Clustered Index Scan会导致非常低下的查询性能，尤其是对于大表或者超大表。执行计划缓存是SQL Server内存管理中非常重要的特性，这篇系列文章我们探讨如何从执行计划缓存的角度来发现RDS SQL数据库引擎中的Table Scan行为，以及与之相应SQL查询语句详细信息。问题分析其实，我们大家都知道，Table Scan或者....

文章 2017-08-07 来自：开发者社区

RDS SQL Server - 专题分享 - 巧用执行计划缓存之执行计划编译

背景引入执行计划缓存是SQL Server内存管理中非常重要的特性，这篇文章是巧用执行计划缓存系列文章之五，探讨如何从执行计划缓存中获取查询语句执行计划编译的性能消耗，比如：编译时间消耗编译CPU消耗编译内存消耗缓存大小消耗等等一系列非常有价值的统计信息。什么是执行计划编译 SQL查询语句在提交到SQL Server主机服务之后，数据查询访问动作发生之前，SQL Server的编译器....

文章 2017-07-20 来自：开发者社区

RDS SQL Server - 专题分享 - 巧用执行计划缓存之Key Lookup

背景引入执行计划缓存是SQL Server内存管理中非常重要的特性，这篇文章是巧用执行计划缓存系列文章之四，探讨什么是Key Lookup操作，如何从执行计划缓存中发现Key Lookup问题，以及如何解决这个问题。什么是Key Lookup Key Lookup操作是指执行计划通过表的索引查找字段列的书签查找方式。Key Lookup发生在当查询语句使用Index Seek（或者Index....

文章 2017-07-04 来自：开发者社区

RDS SQL Server - 专题分享 - 巧用执行计划缓存之Single-used plans

背景引入执行计划缓存是SQL Server内存管理中非常重要的特性，这篇系列文章我们探讨执行计划缓存设计中遇到的single-used plans问题，以及如何发现、如何定性和定量分析single-used plans带来的影响，最后我们使用两种方法来解决这个问题。什么是Single-used Plans 要解释清楚什么是Single-used Plans，首先需要解释SQL语句执行计划缓存....

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