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| 分析SQL语句性能3种方法分享 |
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第一种方法： 复制代码 代码如下: Minimsdn.com为您提供的代码: -- Turn ON [Display IO Info when execute SQL] SET STATISTICS IO ON -- Turn OFF [Display IO Info when execute SQL] SET STATISTICS IO OFF Link: http://msdn.microsoft.com/zh-cn/library/ms184361.aspx 第二种方法: 复制代码 代码如下: MINIMSDN.com为您提供的代码: --Turn ON [Display detail info and the request for resources] SET SHOWPLAN_ALL ON -- Turn OFF [Display detail info and the request for resources] SET SHOWPLAN_ALL OFF Link: http://msdn.microsoft.com/zh-cn/library/ms187735 第三种方法:
Demo For three kinds of Method: For SQL Script: 复制代码 代码如下: select * from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC v Its Execution plan: (
v Its IO info: (
- - You can try one table with 100/10000/1000000 rows but create/don't create Clustered/NONCLUSTERED Index. v Its Detail info Etc.: (
复制代码 代码如下: select top 100 * from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC v Its Execution plan: (
v Its IO info: (
v Its Detail info Etc.: (
For SQL Script: 复制代码 代码如下: select top 100 * from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC order by StagingOMC.COrgTPName v Its Execution plan: (
v Its IO info: (
v Its Detail info Etc.: (
For SQL Script: 复制代码 代码如下: select top 100 StagingOMC.COrgTPName,COUNT(CorgID) from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC group by StagingOMC.COrgTPName order by StagingOMC.COrgTPName v Its Execution plan: (
v Its IO info: ( v Its Detail info Etc.: (
- - By these three kinds of methods, you can try to check those words in the internet web are right or wrong about how to improve SQL Script performance. |
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