软件开发培训班 >> 编程开发 >> SQL


分析SQL语句性能3种方法分享

　　本文标签：SQL语句性能

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:

Links: http://msdn.microsoft.com/zh-cn/library/ff650689.aspx ; http://msdn.microsoft.com/zh-cn/library/aa175244(v=SQL.80).aspx
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/dont create Clustered/NONCLUSTERED Index.

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

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.