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 2016-11-09 来自：开发者社区

ORACLE SQL调优之统计信息缺失导致的逻辑读暴增

2016年11月8日，接到广西负责人申告，说决策系统一条SQL平时执行2s左右能执行完，现在却要执行2:30多才能出结果，请求对其做处理。操作系统：RHEL LINUX 6.4 数据库版本：11.2.0.4 首先，登录服务器查看数据库服务器的状态： [oracle@orcl ~]$ f...

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