(转)查看SQLServer最耗资源时间的SQL语句

原文地址：https://www.cnblogs.com/My-Dream/p/6270308.html

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