查看SQLServer最耗资源时间的SQL语句

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,
(
(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 20total_worker_time/1000 AS [总消耗CPU 时间(ms)],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,(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.dbid,qt.objectid,qt.dbid) ObjectNameFROM sys.dm_exec_query_stats qs WITH(nolock)CROSS apply sys.dm_exec_sql_text(qs.sql_handle) AS qtWHERE execution_count>1ORDER BY total_worker_time DESC

（编辑：李大同）

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