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SQLSERVER语句的执行时间显示的统计结果是什么意思 - 站长搜索
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SQLSERVER语句的执行时间显示的统计结果是什么意思

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2022-09-23 16:57:24 转载来源: 网络整理/侵权必删

在SQL语句调优的时候,大部分都会查看语句执行时间,究竟SQLSERVER显示出来的统计结果是什么意思?下面看一下例子比较简单的语句:复制代码代码如下:1SETSTATISTICSTIMEON2USE[pratice]3GO4SELECT*FROM[dbo].[Orders]结果:复制代码代码如下:SQLServer分析和编译时间:CPU时间=0毫秒,占用时间=0毫秒。SQLServer执行时间:CPU时间=0毫秒,占用时间=0毫秒

在SQL语句调优的时候,大部分都会查看语句执行时间,究竟SQLSERVER显示出来的统计结果是什么意思
下面看一下例子
比较简单的语句
复制代码 代码如下:

1 SET STATISTICS TIME ON
2 USE [pratice]
3 GO
4 SELECT * FROM [dbo].[Orders]

结果
复制代码 代码如下:

SQL Server 分析和编译时间:
CPU 时间 = 0 毫秒,占用时间 = 0 毫秒。
SQL Server 执行时间:
CPU 时间 = 0 毫秒,占用时间 = 0 毫秒。
SQL Server 执行时间:
CPU 时间 = 0 毫秒,占用时间 = 0 毫秒。
SQL Server 分析和编译时间:
CPU 时间 = 0 毫秒,占用时间 = 0 毫秒。
(121317 行受影响)
SQL Server 执行时间:
CPU 时间 = 109 毫秒,占用时间 = 2506 毫秒。

语句的CPU时间分编译阶段和执行阶段。优化者要先搞清楚这两个阶段各用了多少CPU资源。
然后,再看有没有优化降低CPU使用量的可能
上面的CPU时间是指:执行语句的时间
而占用时间是指:从磁盘读取数据再处理总的使用时间
编译阶段
SQL Server 分析和编译时间:
执行阶段
SQL Server 执行时间:

标签: SQLSERVER 语句 执行 时间 显示 统计 结果 是什么 意思


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