CPU on the roof with sqlserver.

SQL server is using 99% CPU

I right clicked the instance in Management studio, and did a CPU report and found the following SP was the issue

alter procedure [dbo].[sp_GetTrackerPointDataForAllDevices]	
as
Begin
	
	WITH CTE_RecentDevice (DeviceID, CommanTrackingID, GPSDateTime)
	AS (
		SELECT vpkDeviceID, MAX(ipkCommanTrackingID), MAX(dGPSDateTime)
		FROM vwCommonTrackingData
		GROUP BY vpkDeviceID
		)
	 SELECT distinct
	    A.ipkCommanTrackingID,
		A.ipkDeviceID,
		A.vpkDeviceID,
		isnull(vVehicleSpeed,0) as vVehicleSpeed,		
		isnull(bIsIgnitionOn,0) as bIsIgnitionOn,
		vEventName,
		isnull(A.iTrackerType,0) as iTrackerType,
		vHeading,
		A.vDeviceName,
		vLatitude,
		vLongitude,
		--GroupID,
		--ParentGroupID,
		isnull(ifkDriverID,0) as ifkDriverID,
		dGPSDateTime,
		vTextMessage,
		isnull(vOdometer, 0) as vOdometer,
		isnull(vReportID, 0) as vReportID,
		isnull(vSequenceID,0) as vSequenceID,
		isnull(Fuel,0) as Fuel,
		AssetPhotoName,		
		isnull(bIsGsmLocation, 0) as bIsGsmLocation,	
		D.vLogo,
		D.vLogoName,
		C.vLogo 'DvLogo',
		C.vLogoName 'DvLogoName',
		C.DriverName,
		isnull(iStartAngle,0) as iStartAngle,
		isnull(iStopAngle,0) as iStopAngle,
		isnull(iInRadius,0) as iInRadius,
		isnull(iOutRadius,0) as iOutRadius,
		isnull(iBatteryBackup,0) as iBatteryBackup,
		E.vDeviceName 'AssetType'
	  from vwCommonTrackingData A
		inner join CTE_RecentDevice R on R.DeviceID = A.vpkDeviceID and R.CommanTrackingID = A.ipkCommanTrackingID 
		inner join wlt_tblDevices B  on B.Id=A.ipkDeviceID
		inner join wlt_tblAssets D on D.Id=ifk_AssignedAssetId
		left outer join wlt_tblDevice_Master_SuperAdmin E on E.ipkDeviceID=B.ifk_DeviceTypeId
		left outer join wlt_tblAssets_Driver C on C.ipkDriverID=A.ifkDriverID
		left outer join wlt_tblTrackingData_Gsm on ifk_CommonTrackingId=ipkCommanTrackingID
		order by ipkCommanTrackingID desc


end

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What tools can I use to see why this code is an issue?
Ora can anyone spot anything obvious?
websssAsked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Check for blocked sessions. Open a new query window a run the following command:
exec sp_who2

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Will return a list of rows and each one representing a session. Check for Blocking column. If any has a value greater than zero means that process is being blocked by the process number referenced in the blocking column.
For solving the issue immediately you can add a locking hint in all tables in the SELECT:
(...)
from vwCommonTrackingData WITH (NOLOCK) A
            inner join CTE_RecentDevice WITH (NOLOCK) R on R.DeviceID = A.vpkDeviceID and R.CommanTrackingID = A.ipkCommanTrackingID
            inner join wlt_tblDevices WITH (NOLOCK) B  on B.Id=A.ipkDeviceID
            inner join wlt_tblAssets WITH (NOLOCK) D on D.Id=ifk_AssignedAssetId
            left outer join wlt_tblDevice_Master_SuperAdmin WITH (NOLOCK) E on E.ipkDeviceID=B.ifk_DeviceTypeId
            left outer join wlt_tblAssets_Driver WITH (NOLOCK) C on C.ipkDriverID=A.ifkDriverID
            left outer join wlt_tblTrackingData_Gsm WITH (NOLOCK) on

(...)
but better way is to review the indexes since you may need to create indexes to improve the query speed so it will avoid locks.
0
Barry CunneyCommented:
Hi Websss,
Another tip, to try to improve your actual  query, is to try and change your SQL so that it does not use SELECT DISTINCT.

It is better to do SELECT COLa, COLb FROM TABLE_1 GROUP BY COLa, COLb
0
Scott PletcherSenior DBACommented:
Would need to see the table definitions, esp. of any view(s) used.  Also, all index definitions and the query plan (estimated plan is OK in this case, since it's too much overhead to comfortably run the query to get the actual plan).

In general, use the actual tables rather than a view(s), or make sure the views are efficient if you really need to use views, such as for filtering rows or doing obscure joins.  Often an in-line table-valued function can perform much better than a traditional view.
0
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websssAuthor Commented:
Here is the  SPWHO results
spwho2
0
Vitor MontalvãoMSSQL Senior EngineerCommented:
You don't have any blocking but I can see that SQL Server is using few memory.
How much RAM the server has? And how's the memory configured to that SQL Server instance (min and max memory)?
Also, which edition and version of SQL Server are you running? 32 or 64 bits?
0
websssAuthor Commented:
Its a dev server with 4gb ram, the database isn't that big on the dev server (1.94gb MDF and 24mb LDF)
Its a 64bit version is 2014 enterprise

Min and max mem have not been altered so will be system defaults
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Vitor MontalvãoMSSQL Senior EngineerCommented:
I'm sorry but I just missed your last comment.
I don't know if you still need help with this but here you go.

Being a DEV environment you must have many applications running in the same machine, right? 4GB would be ok for a dedicated DEV SQL Server instance with a single database but if SQL Server needs to share resources with other applications like SSRS, SSIS, SSAS or MS Visual Studio, it will be short of memory and CPU.
0

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