Как узнать какие запросы грузят CPU процессор.

Нагрузка на CPU по базам:

WITH DB_CPU_Stats
AS
(SELECT DatabaseID, DB_Name(DatabaseID) AS [DatabaseName], SUM(total_worker_time) AS [CPU_Time_Ms]
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY (SELECT CONVERT(int, value) AS [DatabaseID]
             FROM sys.dm_exec_plan_attributes(qs.plan_handle)
             WHERE attribute = N'dbid') AS F_DB
GROUP BY DatabaseID)
SELECT ROW_NUMBER() OVER(ORDER BY [CPU_Time_Ms] DESC) AS [row_num],
      DatabaseName, [CPU_Time_Ms],
      CAST([CPU_Time_Ms] * 1.0 / SUM([CPU_Time_Ms]) OVER() * 100.0 AS DECIMAL(5, 2)) AS [CPUPercent]
FROM DB_CPU_Stats
WHERE DatabaseID > 4 -- system databases
AND DatabaseID <> 32767 -- ResourceDB
ORDER BY row_num OPTION (RECOMPILE);

Наибольшая нагрузка на CPU

ELECT TOP 10 
[Average CPU used] = total_worker_time / qs.execution_count
,[Total CPU used] = total_worker_time
,[Execution count] = qs.execution_count
,[Inpidual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
(CASE WHEN qs.statement_end_offset = -1 
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
ELSE qs.statement_end_offset END - 
qs.statement_start_offset)/2)
,[Parent Query] = qt.text
,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
ORDER BY [Average CPU used] DESC;

Наиболее часто выполняемые запросы

SELECT TOP 10 
[Execution count] = execution_count
,[Inpidual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
        (CASE WHEN qs.statement_end_offset = -1 
           THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
         ELSE qs.statement_end_offset END - qs.statement_start_offset)/2)
,[Parent Query] = qt.text
,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
ORDER BY [Execution count] DESC;

Текущая статистика по задержкам (расшифровка задержек)

SELECT TOP 10
[Wait type] = wait_type,
[Wait time (s)] = wait_time_ms / 1000,
[% waiting] = CONVERT(DECIMAL(12,2), wait_time_ms * 100.0 
             / SUM(wait_time_ms) OVER())
FROM sys.dm_os_wait_stats
WHERE wait_type NOT LIKE '%SLEEP%' 
ORDER BY wait_time_ms DESC;

Индексы с высокими издержками при использовании

-- Create required table structure only.
-- Note: this SQL must be the same as in the Database loop given in the following step.
SELECT TOP 1
       [Maintenance cost]  = (user_updates + system_updates)
       ,[Retrieval usage] = (user_seeks + user_scans + user_lookups)
       ,DatabaseName = DB_NAME()
       ,TableName = OBJECT_NAME(s.[object_id])
       ,IndexName = i.name
INTO #TempMaintenanceCost
FROM   sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON  s.[object_id] = i.[object_id]
   AND s.index_id = i.index_id
WHERE s.database_id = DB_ID()
   AND OBJECTPROPERTY(s.[object_id], 'IsMsShipped') = 0
   AND (user_updates + system_updates) > 0 -- Only report on active rows.
   AND s.[object_id] = -999  -- Dummy value to get table structure.;
-- Loop around all the databases on the server.
EXEC sp_MSForEachDB    'USE [?];
-- Table already exists.
INSERT INTO #TempMaintenanceCost
SELECT TOP 10
       [Maintenance cost]  = (user_updates + system_updates)
       ,[Retrieval usage] = (user_seeks + user_scans + user_lookups)
       ,DatabaseName = DB_NAME()
       ,TableName = OBJECT_NAME(s.[object_id])
       ,IndexName = i.name
FROM   sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON  s.[object_id] = i.[object_id]
   AND s.index_id = i.index_id
WHERE s.database_id = DB_ID()
   AND i.name IS NOT NULL    -- Ignore HEAP indexes.
   AND OBJECTPROPERTY(s.[object_id], ''IsMsShipped'') = 0
   AND (user_updates + system_updates) > 0 -- Only report on active rows.
ORDER BY [Maintenance cost]  DESC;'
-- Select records.
SELECT TOP 10 * FROM #TempMaintenanceCost
ORDER BY [Maintenance cost]  DESC
-- Tidy up.
DROP TABLE #TempMaintenanceCost

Top запросов, создающих нагрузку на CPU на сервере СУБД за последний час

SELECT
SUM(qs.max_elapsed_time) as elapsed_time,
SUM(qs.total_worker_time) as worker_time
into T1 FROM (
       select top 100000       *       from
       sys.dm_exec_query_stats qs
       where qs.last_execution_time > (CURRENT_TIMESTAMP - '01:00:00.000')
       order by qs.total_worker_time desc
       --order by qs.max_elapsed_time desc
) as qs;
select top 100
(qs.max_elapsed_time) as elapsed_time,
(qs.total_worker_time) as worker_time,
qp.query_plan,
st.text,
dtb.name,
qs.*,
st.dbid
INTO T2
FROM
sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st
left outer join sys.databases as dtb on st.dbid = dtb.database_id
where qs.last_execution_time > (CURRENT_TIMESTAMP - '01:00:00.000')
order by qs.total_worker_time desc
--order by qs.max_elapsed_time desc;
select
(T2.elapsed_time*100/T1.elapsed_time) as percent_elapsed_time,
(T2.total_worker_time*100/T1.worker_time) as percent_worker_time,
T2.*
from
T2 as T2
INNER JOIN T1 as T1
ON 1=1
order by T2.total_worker_time desc
--order by T2.max_elapsed_time desc;
drop table T2;
drop table T1;

Статистика с планом

select 
	creation_time,
	last_execution_time,
	execution_count,
	total_worker_time/1000 as CPU,
	convert(money, (total_worker_time))/(execution_count*1000)as [AvgCPUTime],
	qs.total_elapsed_time/1000 as TotDuration,
	convert(money, (qs.total_elapsed_time))/(execution_count*1000)as [AvgDur],
	total_logical_reads as [Reads],
	total_logical_writes as [Writes],
	total_logical_reads+total_logical_writes as [AggIO],
	convert(money, (total_logical_reads+total_logical_writes)/(execution_count + 0.0))as [AvgIO],
	case 
		when sql_handle IS NULL then ' '
		else(substring(st.text,(qs.statement_start_offset+2)/2,(
			case
				when qs.statement_end_offset =-1 then len(convert(nvarchar(MAX),st.text))*2      
				else qs.statement_end_offset    
			end - qs.statement_start_offset)/2  ))
	end as query_text,
	db_name(st.dbid)as database_name,
	object_schema_name(st.objectid, st.dbid)+'.'+object_name(st.objectid, st.dbid) as object_name,
	qp.query_plan
from sys.dm_exec_query_stats  qs
cross apply sys.dm_exec_sql_text(sql_handle) st
cross apply sys.dm_exec_query_plan(qs.plan_handle) qp

 

 

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