标签 PostgreSQL , 空间类型 , 统计信息 , 包含查询 , 相交查询 , BOUND , index , x , y 背景 PostgreSQL 通过几何类型以及PostGIS插件，支持丰富的空间类型，空间数据类型包括KNN检索，空间包含，空间相交，方位搜索，空间计算等操作。为了得到正确的执行计划，在数据库优化器中，评估满足某个操作符条件的行数，是一个重要的CBO依据。而评...

文章 2017-11-15 来自：开发者社区

SQL Server性能调优之执行计划深度剖析第二节执行计划第一次实践

SQL Server性能调优之执行计划深度剖析第二节执行计划第一次实践前言:自从上一篇文章发出之后，收到了很朋友的关注。很多朋友要求多多实践，而不是纯粹的理论。确实，从打算出这个系列开始，我就本着实践的思想来进行的！同时，为了使得大家更好的理解、消化这些知识，我会定期的就所写内容进行在线的视频讲座，朋友们可以去参与这个小组：http://www.agilesharp.com/c/sqlpr....

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