查看SQLServer最耗资源时间的SQL语句

爱被打了一巴掌 2022-05-22 09:35 362阅读 0赞

**1.找出执行时间最长的10条SQL（适用于SQL SERVER 2005及其以上版本）**

SELECT top 10  
        (total_elapsed_time / execution_count)/1000 N'平均时间ms'  
        ,total_elapsed_time/1000 N'总花费时间ms'  
        ,total_worker_time/1000 N'所用的CPU总时间ms'  
        ,total_physical_reads N'物理读取总次数'  
        ,total_logical_reads/execution_count N'每次逻辑读次数'  
        ,total_logical_reads N'逻辑读取总次数'  
        ,total_logical_writes N'逻辑写入总次数'  
        ,execution_count N'执行次数'  
        ,creation_time N'语句编译时间'  
        ,last_execution_time N'上次执行时间'  
        ,SUBSTRING(  
            st.text,   
            (qs.statement_start_offset/2) + 1,   
            (  
                (CASE statement_end_offset WHEN -1 THEN DATALENGTH(st.text) ELSE qs.statement_end_offset END - qs.statement_start_offset)/2  
            ) + 1  
        ) N'执行语句'  
        ,qp.query_plan  
    FROM  sys.dm_exec_query_stats AS qs 
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st 
    CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp  
    WHERE  
        SUBSTRING(  
            st.text,   
            (qs.statement_start_offset/2) + 1,  
            (  
                (CASE statement_end_offset WHEN -1 THEN DATALENGTH(st.text) ELSE qs.statement_end_offset END - qs.statement_start_offset)/2  
            ) + 1  
        ) not like '%fetch%'  
    ORDER BY  total_elapsed_time / execution_count DESC;  
    
    
    如果想对SQL作筛选，可将
    not like '%fetch%'  换成  like '%user%'就可以找出SQL语句中含有user关键字的SQL

**2 找出执行最慢的SQL语句（适用于SQL SERVER 2005及其以上版本）**

SELECT
        (total_elapsed_time / execution_count)/1000 N'平均时间ms'
        ,total_elapsed_time/1000 N'总花费时间ms'
        ,total_worker_time/1000 N'所用的CPU总时间ms'
        ,total_physical_reads N'物理读取总次数'
        ,total_logical_reads/execution_count N'每次逻辑读次数'
        ,total_logical_reads N'逻辑读取总次数'
        ,total_logical_writes N'逻辑写入总次数'
        ,execution_count N'执行次数'
        ,SUBSTRING(st.text, (qs.statement_start_offset/2) + 1
        ,((CASE statement_end_offset
        WHEN -1 THEN DATALENGTH(st.text)
        ELSE qs.statement_end_offset END
        - qs.statement_start_offset)/2) + 1) N'执行语句'
        ,creation_time N'语句编译时间'
        ,last_execution_time N'上次执行时间'
        FROM
        sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st
    WHERE
    SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,
    ((CASE statement_end_offset
    WHEN -1 THEN DATALENGTH(st.text)
    ELSE qs.statement_end_offset END
    - qs.statement_start_offset)/2) + 1) not like '�tch%'
    ORDER BY
    total_elapsed_time / execution_count DESC;

**3 找出最耗时的前N条T-SQL语句 （适用于SQL SERVER 2005及其以上版本）**

--给N赋初值为30  
    declare @n int set @n=30   
      
    ;with maco as   
    (     
        select top (@n)  
            plan_handle,  
            sum(total_worker_time) as total_worker_time ,  
            sum(execution_count) as execution_count ,  
            count(1) as sql_count  
        from sys.dm_exec_query_stats group by plan_handle  
        order by sum(total_worker_time) desc  
    )  
    select  t.text ,  
            a.total_worker_time ,  
            a.execution_count ,  
            a.sql_count  
    from    maco a  
            cross apply sys.dm_exec_sql_text(plan_handle) t  
              
    /* 结果格式如下  
    text     total_worker_time  execution_count   sql_count  
    -------- ------------------ ----------------- ---------  
    内容略  
    */

**4 平均耗CPU最多的前个SQL （SQL SERVER 2005或以上版本）**

SELECT TOP 5 total_worker_time / execution_count AS [Avg CPU Time],  
        SUBSTRING(st.text, (qs.statement_start_offset/2)+1,   
            ((CASE qs.statement_end_offset  
                WHEN -1 THEN DATALENGTH(st.text)  
                ELSE qs.statement_end_offset  
                END - qs.statement_start_offset)/2) + 1) AS statement_text   
     FROM sys.dm_exec_query_stats AS qs   
     CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st   
     ORDER BY total_worker_time/execution_count DESC

**5 平均耗CPU最多的前个SQL （SQL SERVER 2008或以上版本）**

SELECT TOP 20
        total_worker_time/1000 AS [总消耗CPU 时间(ms)],execution_count [运行次数],
        qs.total_worker_time/qs.execution_count/1000 AS [平均消耗CPU 时间(ms)],
        last_execution_time AS [最后一次执行时间],min_worker_time /1000 AS [最小执行时间(ms)],
        max_worker_time /1000 AS [最大执行时间(ms)],
        SUBSTRING(qt.text,qs.statement_start_offset/2+1, 
            (CASE WHEN qs.statement_end_offset = -1 
            THEN DATALENGTH(qt.text) 
            ELSE qs.statement_end_offset END -qs.statement_start_offset)/2 + 1) 
        AS [使用CPU的语法], qt.text [完整语法],
        qt.dbid, dbname=db_name(qt.dbid),
        qt.objectid,object_name(qt.objectid,qt.dbid) ObjectName
    FROM sys.dm_exec_query_stats qs WITH(nolock)
    CROSS apply sys.dm_exec_sql_text(qs.sql_handle) AS qt
    WHERE  execution_count>1
    ORDER BY (qs.total_worker_time/qs.execution_count/1000) DESC

**6 总耗CPU最多的前个SQL （SQL SERVER 2008或以上版本）**

SELECT TOP 20
        total_worker_time/1000 AS [总消耗CPU 时间(ms)],execution_count [运行次数],
        qs.total_worker_time/qs.execution_count/1000 AS [平均消耗CPU 时间(ms)],
        last_execution_time AS [最后一次执行时间],max_worker_time /1000 AS [最大执行时间(ms)],
        SUBSTRING(qt.text,qs.statement_start_offset/2+1, 
            (CASE WHEN qs.statement_end_offset = -1 
            THEN DATALENGTH(qt.text) ELSE qs.statement_end_offset END -qs.statement_start_offset)/2 + 1) AS [使用CPU的语法], qt.text [完整语法], qt.dbid, dbname=db_name(qt.dbid), qt.objectid,object_name(qt.objectid,qt.dbid) ObjectName FROM sys.dm_exec_query_stats qs WITH(nolock) CROSS apply sys.dm_exec_sql_text(qs.sql_handle) AS qt WHERE execution_count>1 ORDER BY total_worker_time DESC