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SQLServer执行计划成本（续3）

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Release： 2016-06-07 17:46:55
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循环、哈希与合并连接比较

在分别讨论了循环、哈希与合并连接的执行计划成本规则之后，现在将3个连接类型放到适合各自条件的环境下一起比较。

下面的图2-27显示了循环、哈希与合并连接在1P/2P系统上的启动成本。外部源和内部源启动成本描述了索引搜索的基本成本包括每行成本0.0000011。连接成本也除去第一行，这样似乎仅有个案是少量变化的。4P系统的启动成本仅在索引搜索基本成本（0.003283025）上不同。

图2-27.循环、哈希与合并连接在1P/2P系统上索引搜索的启动成本


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0.003283025 0.0000011 27
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