SQL查看开销较高的语句(效率最低的语句)

--简单查询：

SELECT TOP 200 execution_count as [Number Of Executions],

total_worker_time/execution_count as [Average CPU Time],

total_elapsed_time/execution_count as [Average Elapsed Time],

(

SELECT SUBSTRING(text,statement_start_offset/2,

(CASE WHEN statement_end_offset = -1

THEN LEN(CONVERT(nvarchar(max),text)) *2

ELSE statement_end_offset END - statement_start_offset) /2)

FROM sys.dm_exec_sql_text(sql_handle)

) as query_text

FROM sys.dm_exec_query_stats

ORDER BY [Average CPU Time] DESC;



------------------------------------------------------------------------------------------------------------------------
--明细查询：

SELECT TOP 200 total_worker_time / 1000 AS [自编译以来执行所用的CPU时间总量(ms)],
total_elapsed_time/1000 as [完成执行此计划所用的总时间],
total_elapsed_time / execution_count/1000 as [平均完成执行此计划所用时间],
execution_count as [上次编译以来所执行的次数], 
creation_time as [编译计划的时间],
deqs.total_worker_time / deqs.execution_count / 1000 AS [平均使用CPU时间(ms)],
last_execution_time AS [上次开始执行计划的时间],
total_physical_reads [编译后在执行期间所执行的物理读取总次数],
total_logical_reads/execution_count [平均逻辑读次数],
min_worker_time /1000 AS [单次执行期间所用的最小CPU时间(ms)],
max_worker_time / 1000 AS [单次执行期间所用的最大 CPU 时间(ms)],
SUBSTRING(dest.text, deqs.statement_start_offset / 2 + 1, 
(CASE
WHEN deqs.statement_end_offset = -1 THEN
DATALENGTH(dest.text) 
ELSE deqs.statement_end_offset
END - deqs.statement_start_offset
) / 2 + 1) AS [执行SQL], 
dest.text as [完整SQL],
db_name(dest.dbid) as [数据库名称],
object_name(dest.objectid, dest.dbid) as [对象名称]
,deqs.plan_handle [查询所属的已编译计划]
FROM sys.dm_exec_query_stats deqs WITH(NOLOCK)
CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest

--平均使用CPU时间降序
ORDER BY (deqs.total_worker_time / deqs.execution_count / 1000) DESC
--执行时间降序
--ORDER BY total_elapsed_time / execution_count DESC;


------------------------------------------------------------------------------------------------------------
--查看执行计划：

select * from sys.dm_exec_query_plan(0x05000A0045E84551103903112400000001000000000000000000000000000000000000000000000000000000)