原文:sql server 索引阐述系列八统计信息一.概述　　　　sql server在快速查询值时只有索引还不够，还需要知道操作要处理的数据量有多少，从而估算出复杂度，选择一个代价小的执行计划，这样sql server就知道了数据的分布情况。索引的统计值信息，还内置策略用来在没有索引的属性列上创建统计值。在有索引和没有索引的属性列上统计值信息会被自动维护。大部分场景下不需要手动去维护统计....

文章 2015-03-06 来自：开发者社区

第十二章——SQLServer统计信息（3）——发现过期统计信息并处理

原文: 第十二章——SQLServer统计信息（3）——发现过期统计信息并处理前言：统计信息是关于谓词中的数据分布的主要信息源，如果不知道具体的数据分布，优化器不能获得预估的数据集，从而不能统计需要返回的数据。在创建列的统...

文章 2015-03-06 来自：开发者社区

第十二章——SQLServer统计信息（1）——创建和更新统计信息

原文: 第十二章——SQLServer统计信息（1）——创建和更新统计信息简介：查询的统计信息：目前为止，已经介绍了选择索引、维护索引。如果有合适的索引并实时更新统计信息，那么优化器会选择有用的索引供查询之用，因为SQLServer优化器是基于开销的优化。当在where和on上的列上的数据需要显示在结果集的时候，如果有实时的统计信息，优...

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