sp_PerfSQ
A diagnostic tool for identifying Performance features of active SQL Queries. It collects performance detail from DMVs for queries with executing requests and is designed to demonstrate and quantify Query Shaping optimisation techniques by:
- quantifying query workload and throughput characteristics
- providing behavioural descriptors of potential performance inhibitors - refer column ThrottlePotential
The ThrottlePotential column is populated using a behavioural parser and attempts to provide insight into the following - including parameter sniffing issues:
Server related metrics are displayed in the Messages tab of SQL Server Management Studio.
This stored procedure is designed to work with SQL Server 2008 R2 and higher.
Optional Parameters:
@ParamSniff
Parameter Sniffing sensitivity multiplier:
< 1.0 (more hits)
= 1 or NULL (DEFAULT)
> 1.0 (less hits)
Must be within the range of 0 to 2.0 otherwise will default to 1.0
@SessionLocks
Toggle off/on session locking detail displayed in column SessionLocks:
= 0 or NULL (DEFAULT is off)
= 1
A value of 1 will retrieve locking detail from sys.dm_tran_locks increasing performance overhead.
Example Usage:
EXEC dbo.sp_PerfSQ
GO
EXEC dbo.sp_PerfSQ @ParamSniff=0.75, @SessionLocks=1
GO
-----------------------------------------------------------------------------------------
-- sp_PerfSQ: Query Shaping tool identifying Performance features of active SQL Queries
-- Copyright (C) 2018, 2019 Edward Haynes
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Lesser General Public License as published
-- by the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
--
--
-- Stored procedure designed to work with SQL Server 2008 R2 and higher
-- providing on-demand performance detail from DMVs for queries with executing requests
--
-- Optional Parameters:
-- @ParamSniff = Parameter Sniffing sensitivity multiplier
-- < 1.0 (more hits); 1 or NULL (DEFAULT); > 1.0 (less hits)
-- Must be within the range of 0 to 2.0 otherwise will default to 1.0
--
-- @SessionLocks = 0 or NULL -- No locking detail (DEFAULT)
-- = 1 -- Detailed locking (performance overhead)
--
-- Example Usage:
-- EXEC dbo.sp_PerfSQ
-- GO
--
-- EXEC dbo.sp_PerfSQ @ParamSniff=0.75, @SessionLocks=1
-- GO
--
-- Email: QueryShape@gmail.com
--
-----------------------------------------------------------------------------------------
CREATE PROCEDURE dbo.sp_PerfSQ @ParamSniff float = NULL, @SessionLocks bit = NULL
AS
BEGIN
SET NOCOUNT ON ;
DECLARE @Version nvarchar(20) ; SET @Version = N'4.5.17' ;
DECLARE @tmpSchedulers TABLE (RunnableCountAvg int NULL, PendingIOCountAvg int NULL, ThreadShortageAvg int NULL, CPUAllocation nvarchar(50) NULL) ;
DECLARE @ProcessMemLow int,
@SystemMemLow int,
@MaxServerMemory int,
@PhysicalMemory bigint,
@PhysicalMemInUse bigint,
@KernelNonPaged bigint,
@RunnableCountAvg int,
@PendingIOCountAvg int,
@ThreadShortageAvg int,
@CPUAllocation nvarchar(50),
@VerCleanupRatio float,
@Runtime datetime,
@CmdLine nvarchar(100),
@SQLVersion nvarchar(500) ;
SET @ParamSniff = (CASE WHEN @ParamSniff < CONVERT(float,0.0) OR @ParamSniff > CONVERT(float,2.0) THEN CONVERT(float,1.0) ELSE ISNULL(@ParamSniff,CONVERT(float,1.0)) END) ;
SET @SessionLocks = ISNULL(@SessionLocks,CONVERT(bit,0)) ;
SET @CmdLine = N'EXEC sp_PerfSQ ' + N'@ParamSniff=' + CONVERT(nvarchar(20),@ParamSniff) + N', @SessionLocks=' + CONVERT(nvarchar(1),@SessionLocks) + N' --v' + @Version ;
SET @Runtime = getdate() ;
SET @SQLVersion = CONVERT(nvarchar(500),@@Version) ;
SET @SQLVersion = LEFT(@SQLVersion,CHARINDEX(N'COPY',UPPER(@SQLVersion)) - 1)
SET @ProcessMemLow =
(SELECT COUNT(1)
FROM sys.dm_os_process_memory WITH (NOLOCK)
WHERE process_physical_memory_low = CONVERT(bit,1)) ;
SET @SystemMemLow =
(SELECT COUNT(1)
FROM sys.dm_os_sys_memory WITH (NOLOCK)
WHERE system_high_memory_signal_state = CONVERT(bit,0)
AND system_low_memory_signal_state = CONVERT(bit,1)) ;
SET @MaxServerMemory =
(SELECT top 1 CONVERT(int,value_in_use)
FROM sys.configurations WITH (NOLOCK)
WHERE [name] = 'max server memory (MB)') ;
SET @PhysicalMemory =
(SELECT top 1 total_physical_memory_kb / 1024
FROM sys.dm_os_sys_memory WITH (NOLOCK)) ;
SET @PhysicalMemInUse =
(SELECT top 1 physical_memory_in_use_kb / 1024
FROM sys.dm_os_process_memory WITH (NOLOCK)) ;
SET @KernelNonPaged =
(SELECT top 1 kernel_nonpaged_pool_kb / 1024
FROM sys.dm_os_sys_memory WITH (NOLOCK)) ;
INSERT INTO @tmpSchedulers (RunnableCountAvg, PendingIOCountAvg, ThreadShortageAvg, CPUAllocation)
SELECT AVG(os.runnable_tasks_count) as RunnableCountAvg,
AVG(os.pending_disk_io_count) as PendingIOCountAvg,
AVG(os.work_queue_count) as ThreadShortageAvg,
CONVERT(nvarchar(20),COUNT(1)) + N' of ' + CONVERT(nvarchar(20),SUM(CONVERT(int,os.is_online)))
as CPUAllocation
FROM sys.dm_os_schedulers os WITH (NOLOCK)
WHERE os.scheduler_id < 1048576 ;
SET @RunnableCountAvg =
(SELECT top 1 RunnableCountAvg
FROM @tmpSchedulers) ;
SET @PendingIOCountAvg =
(SELECT top 1 PendingIOCountAvg
FROM @tmpSchedulers) ;
SET @ThreadShortageAvg =
(SELECT top 1 ThreadShortageAvg
FROM @tmpSchedulers) ;
SET @CPUAllocation =
(SELECT top 1 CPUAllocation
FROM @tmpSchedulers) ;
SET @VerCleanupRatio =
(SELECT top 1 CONVERT(float,(cntr_value/1024.0) * 100.0)
FROM sys.dm_os_performance_counters WITH (NOLOCK)
WHERE counter_name = N'Version Cleanup rate (KB/s)'
AND 0 < CHARINDEX(N'Transactions',[object_name])) / (SELECT top 1 CONVERT(float,cntr_value/1024.0)
FROM sys.dm_os_performance_counters WITH (NOLOCK)
WHERE counter_name = N'Version Generation rate (KB/s)'
AND 0 < CONVERT(float,cntr_value/1024.0)
AND 0 < CHARINDEX(N'Transactions',[object_name])) ;
PRINT @CmdLine ;
PRINT N''
PRINT @SQLVersion
PRINT N'Memory'
PRINT N' Total Physical Memory : ' + CONVERT(nvarchar(20),@PhysicalMemory) + N' MB'
PRINT N' Max SQL Server Memory : ' + CONVERT(nvarchar(20),@MaxServerMemory) + N' MB'
PRINT N' Physical Memory In Use: ' + CONVERT(nvarchar(20),@PhysicalMemInUse) + N' MB' + (CASE WHEN (@ProcessMemLow + @SystemMemLow) > 0 THEN N' (memory pressure)' ELSE N'' END)
PRINT N' Kernel Non-Paged Pool : ' + CONVERT(nvarchar(20),@KernelNonPaged) + N' MB'
PRINT N'Schedulers'
PRINT N' Avg CPU Queue Length : ' + CONVERT(nvarchar(20),@RunnableCountAvg)
PRINT N' Avg IO Pending Count : ' + CONVERT(nvarchar(20),@PendingIOCountAvg)
PRINT N' Avg Thread Shortage : ' + CONVERT(nvarchar(20),@ThreadShortageAvg)
PRINT N' CPU Allocation : ' + @CPUAllocation
PRINT N'Version Store'
PRINT N' Version Cleanup Ratio : ' + ISNULL(CONVERT(nvarchar(20),CONVERT(numeric(16,2),@VerCleanupRatio)) + N'%',N'NA')
PRINT N''
;WITH XMLNAMESPACES(DEFAULT N'http://schemas.microsoft.com/sqlserver/2004/07/showplan'),
cteQRequests (SPID,DatabaseName,[Status],RuntimeSec,BlockedBy,DatabaseMaint,EstFinishTime,MemRequestMB,MemGrantMB,MemGrantWait,DOP,query_cost,PAGEIOLATCHms,PAGELATCHms,RunnableCount,SpinLoopFlag,ThreadShortageFlag,ProgramName,OriginalLogin,sql_handle,statement_start_offset,statement_end_offset,plan_handle)
AS (SELECT r.session_id as SPID,
DB_NAME(s.database_id) as DatabaseName,
(CASE UPPER(r.[status])
WHEN N'BACKGROUND' THEN CONVERT(int,1)
WHEN N'RUNNING' THEN CONVERT(int,2)
WHEN N'RUNNABLE' THEN CONVERT(int,3)
WHEN N'SLEEPING' THEN CONVERT(int,4)
WHEN N'SUSPENDED' THEN CONVERT(int,5)
ELSE CONVERT(int,NULL)
END) as [Status],
CONVERT(int,r.total_elapsed_time / 1000)
as RuntimeSec,
(CASE WHEN r.blocking_session_id = 0 THEN CONVERT(smallint,NULL) ELSE r.blocking_session_id END)
as BlockedBy,
r.command as DatabaseMaint,
r.estimated_completion_time as EstFinishTime,
CONVERT(float,m.requested_memory_kb / 1024.0)
as MemRequestMB,
CONVERT(float,m.granted_memory_kb / 1024.0)
as MemGrantMB,
(CASE WHEN m.session_id = r.session_id AND m.request_id = r.request_id AND m.grant_time IS NULL THEN CONVERT(int,1) ELSE CONVERT(int,0) END)
as MemGrantWait,
m.dop as DOP,
m.query_cost as query_cost,
(CASE WHEN r.wait_type LIKE N'PAGEIOLATCH_%' THEN r.wait_time ELSE CONVERT(int,NULL) END)
as PAGEIOLATCHms,
(CASE WHEN r.wait_type LIKE N'PAGELATCH_%' THEN r.wait_time ELSE CONVERT(int,NULL) END)
as PAGELATCHms,
st.RunnableCount as RunnableCount,
st.SpinloopFlag as SpinLoopFlag,
st.ThreadShortageFlag as ThreadShortageFlag,
s.[program_name] as ProgramName,
s.original_login_name as OriginalLogin,
r.sql_handle,
r.statement_start_offset,
r.statement_end_offset,
r.plan_handle
FROM sys.dm_exec_requests r
LEFT JOIN sys.dm_exec_sessions s WITH (NOLOCK)
ON s.session_id = r.session_id
LEFT JOIN sys.dm_exec_query_memory_grants m WITH (NOLOCK)
ON m.session_id = r.session_id
AND m.request_id = r.request_id
LEFT JOIN (SELECT ot.session_id,
MAX((CASE WHEN ot.task_state = N'RUNNABLE'
THEN os.runnable_tasks_count
ELSE CONVERT(int,0)
END)) as RunnableCount,
MAX((CASE WHEN ot.task_state = N'SPINLOOP'
THEN CONVERT(int,1)
ELSE CONVERT(int,0)
END)) as SpinLoopFlag,
MAX((CASE WHEN ot.task_state = N'PENDING'
THEN CONVERT(int,1)
ELSE CONVERT(int,0)
END)) as ThreadShortageFlag
FROM sys.dm_os_schedulers os WITH (NOLOCK)
INNER JOIN sys.dm_os_tasks ot WITH (NOLOCK)
ON ot.scheduler_id = os.scheduler_id
AND ot.task_state IN (N'RUNNABLE',N'SPINLOOP',N'PENDING')
AND ot.scheduler_id < 1048576
GROUP BY ot.session_id) st
ON st.session_id = r.session_id
WHERE r.database_id <> 32767
AND r.session_id > 0
AND r.session_id <> @@SPID
AND r.sql_handle = (SELECT top 1 r2.sql_handle
FROM sys.dm_exec_requests r2 WITH (NOLOCK)
WHERE r2.session_id = r.session_id
ORDER BY r2.start_time DESC)
AND r.statement_start_offset = (SELECT top 1 r3.statement_start_offset
FROM sys.dm_exec_requests r3 WITH (NOLOCK)
WHERE r3.session_id = r.session_id
AND r3.sql_handle = r.sql_handle
ORDER BY r3.start_time DESC)
),
cteSLocks (SPID,SessionLocks)
AS (SELECT qr.SPID,
CONVERT(nvarchar(max),ISNULL(
STUFF((SELECT N',' + ISNULL(CONVERT(nvarchar(200),tl.request_mode + N' (' + tl.request_status + N':' + tl.resource_type
+ (CASE tl.resource_type
WHEN N'DATABASE' THEN N':' + ISNULL(DB_NAME(tl.resource_database_id),N'')
WHEN N'OBJECT' THEN N':' + ISNULL(OBJECT_NAME(tl.resource_associated_entity_id,tl.resource_database_id),N'') + ISNULL(N'[' + CONVERT(nvarchar(10),i.UnusedIndexCount) + N']',N'')
ELSE N''
END) + N')') + N'x' + CONVERT(nvarchar(10),COUNT(1)),N'')
FROM sys.dm_tran_locks tl WITH (NOLOCK)
OUTER APPLY (SELECT ius.database_id,
ius.[object_id],
COUNT(1) as UnusedIndexCount
FROM sys.dm_db_index_usage_stats ius WITH (NOLOCK)
WHERE ius.database_id = tl.resource_database_id
AND ius.[object_id] = tl.resource_associated_entity_id
AND ius.user_updates > (ius.user_seeks + ius.user_lookups + ius.user_scans)
AND tl.resource_type = N'OBJECT'
GROUP BY ius.database_id,
ius.[object_id]) i
WHERE tl.request_session_id = qr.SPID
AND N'NULL' <> ISNULL(tl.request_mode,N'NULL')
GROUP BY CONVERT(nvarchar(200),tl.request_mode + N' (' + tl.request_status + N':' + tl.resource_type
+ (CASE tl.resource_type
WHEN N'DATABASE' THEN N':' + ISNULL(DB_NAME(tl.resource_database_id),N'')
WHEN N'OBJECT' THEN N':' + ISNULL(OBJECT_NAME(tl.resource_associated_entity_id,tl.resource_database_id),N'') + ISNULL(N'[' + CONVERT(nvarchar(10),i.UnusedIndexCount) + N']',N'')
ELSE N''
END) + N')')
FOR XML PATH('')),1,1,N''),N''))
as SessionLocks
FROM (SELECT SPID FROM cteQRequests WHERE @SessionLocks = CONVERT(bit,1) GROUP BY SPID) qr
),
cteTempdb (SPID,TempdbWaitms,CursorOpen,CursorDormantms,TempdbDeallocMB,TempdbAllocMB,VerActive,VerDuration)
AS (SELECT qr.SPID,
(SELECT MAX(wt.wait_duration_ms)
FROM sys.dm_os_waiting_tasks wt WITH (NOLOCK)
WHERE wt.session_id = qr.SPID
AND wt.wait_type LIKE 'PAGE%LATCH_%'
AND wt.resource_description LIKE CONVERT(nvarchar(10),DB_ID(N'tempdb')) + N':%')
as TempdbWaitms,
(SELECT COUNT(1)
FROM sys.dm_exec_cursors (qr.SPID)
WHERE is_open = CONVERT(bit,1))
as CursorOpen,
(SELECT MAX(dormant_duration)
FROM sys.dm_exec_cursors (qr.SPID)
WHERE is_open = CONVERT(bit,1))
as CursorDormantms,
(SELECT CONVERT(float,SUM(tsu.internal_objects_dealloc_page_count + tsu.user_objects_dealloc_page_count) / 128.0)
FROM tempdb.sys.dm_db_task_space_usage tsu WITH (NOLOCK)
WHERE tsu.session_id = qr.SPID)
as TempdbDeallocMB,
(SELECT CONVERT(float,SUM(tsu.internal_objects_alloc_page_count + tsu.user_objects_alloc_page_count) / 128.0)
FROM tempdb.sys.dm_db_task_space_usage tsu WITH (NOLOCK)
WHERE tsu.session_id = qr.SPID)
as TempdbAllocMB,
(SELECT COUNT(1)
FROM sys.dm_tran_active_snapshot_database_transactions v WITH (NOLOCK)
WHERE v.session_id = qr.SPID
AND v.commit_sequence_num IS NULL)
as VerActive,
(SELECT MAX(v.elapsed_time_seconds)
FROM sys.dm_tran_active_snapshot_database_transactions v WITH (NOLOCK)
WHERE v.session_id = qr.SPID
AND v.commit_sequence_num IS NULL)
as VerDuration
FROM cteQRequests qr
GROUP BY qr.SPID
),
cteQPlan (plan_handle,PlanType,ObjectName,ParameterList,Cardinality,[AvgMissingIndex%],SortRows,TableScanRows,MissingJoin)
AS (SELECT qr.plan_handle,
(SELECT top 1 RTRIM(cp.objtype)
FROM sys.dm_exec_cached_plans cp WITH (NOLOCK)
WHERE cp.plan_handle = qr.plan_handle)
as PlanType,
CONVERT(nvarchar(129),ISNULL(N':' + OBJECT_NAME(qp.objectid,qp.dbid),N''))
as ObjectName,
CONVERT(nvarchar(max),
STUFF((SELECT N',' + l.value('@Column', 'nvarchar(128)') + N'=' + l.value('@ParameterCompiledValue', 'nvarchar(4000)')
FROM qp.query_plan.nodes('//ParameterList/ColumnReference') AS prm(l)
FOR XML PATH('')),1,1,N''))
as ParameterList,
(SELECT CONVERT(float,MAX(s.value('@StatementEstRows', 'float')))
FROM qp.query_plan.nodes('//StmtSimple') stmt(s))
as Cardinality,
(SELECT CONVERT(float,AVG(i.value('@Impact', 'float')))
FROM qp.query_plan.nodes('.//MissingIndexGroup') midx(i))
as [AvgMissingIndex%],
(SELECT CONVERT(float,SUM(op.value('@EstimateRows', 'float')))
FROM qp.query_plan.nodes('//RelOp') rel(op)
WHERE N'Sort' = op.value('@PhysicalOp','nvarchar(60)'))
as SortRows,
(SELECT CONVERT(float,SUM(op.value('@EstimateRows', 'float')))
FROM qp.query_plan.nodes('//RelOp') rel(op)
WHERE N'Table Scan' = op.value('@PhysicalOp','nvarchar(60)'))
as TableScanRows,
(SELECT COUNT(1)
FROM qp.query_plan.nodes('//Warnings[(@NoJoinPredicate[.="1"])]') nojoin(p))
as MissingJoin
FROM (SELECT plan_handle FROM cteQRequests WHERE plan_handle IS NOT NULL GROUP BY plan_handle) qr
CROSS APPLY sys.dm_exec_query_plan(qr.plan_handle) qp
),
cteQStats (sql_handle,plan_handle,RunCount,MinTimeSec,MaxTimeSec,MinRows,MaxRows,AvgCpuLowms,CpuHighms,AvgLogicalReadsMB,[PhyReads%])
AS (SELECT qr.sql_handle,
qr.plan_handle,
MAX(qs.execution_count) as RunCount,
CONVERT(bigint,(MIN(qs.min_elapsed_time) / 1000) / 1000)
as MinTimeSec,
CONVERT(bigint,(MAX(qs.max_elapsed_time) / 1000) / 1000)
as MaxTimeSec,
MIN(qs.min_rows) as MinRows,
MAX(qs.max_rows) as MaxRows,
CONVERT(bigint,AVG(qs.min_worker_time) / 1000)
as AvgCpuLowms,
CONVERT(bigint,MAX(qs.max_worker_time) / 1000)
as CpuHighms,
CONVERT(float,(MAX(qs.total_logical_reads) / MAX(qs.execution_count)) / 128.0)
as AvgLogicalReadsMB,
(CASE WHEN MAX(qs.total_logical_reads) >= CONVERT(bigint,1)
THEN CONVERT(float,MAX(qs.total_physical_reads) * 100.0) / CONVERT(float,MAX(qs.total_logical_reads))
ELSE CONVERT(float,0.0)
END) as [PhyReads%]
FROM (SELECT sql_handle, plan_handle FROM cteQRequests GROUP BY sql_handle, plan_handle) qr
LEFT JOIN sys.dm_exec_query_stats qs WITH (NOLOCK)
ON qs.sql_handle = qr.sql_handle
AND qs.plan_handle = qr.plan_handle
GROUP BY qr.sql_handle,
qr.plan_handle
)
SELECT qr.SPID,
MAX(qr.DatabaseName) as DatabaseName,
(CASE MIN(qr.[Status])
WHEN 1 THEN CONVERT(nvarchar(10),N'Background')
WHEN 2 THEN CONVERT(nvarchar(10),N'Running')
WHEN 3 THEN CONVERT(nvarchar(10),N'Runnable')
WHEN 4 THEN CONVERT(nvarchar(10),N'Sleeping')
WHEN 5 THEN CONVERT(nvarchar(10),N'Suspended')
ELSE CONVERT(nvarchar(10),NULL)
END) as [Status],
(CASE WHEN UPPER(MAX(qp.PlanType)) = N'PROC'
THEN CONVERT(nvarchar(133),N'Proc' + MAX(qp.ObjectName))
ELSE CONVERT(nvarchar(133),MAX(qp.PlanType))
END) as PlanType,
(CASE WHEN MAX(qr.query_cost) < 10 THEN CONVERT(nvarchar(10),N'Low')
WHEN MAX(qr.query_cost) < 100 THEN CONVERT(nvarchar(10),N'Medium')
WHEN MAX(qr.query_cost) < 1000 THEN CONVERT(nvarchar(10),N'Med-High')
WHEN MAX(qr.query_cost) < 10000 THEN CONVERT(nvarchar(10),N'High')
WHEN MAX(qr.query_cost) >= 10000 THEN CONVERT(nvarchar(10),N'VHigh')
ELSE CONVERT(nvarchar(10),NULL)
END) as QueryCost,
CONVERT(nvarchar(200),REPLACE(REPLACE(RTRIM(
(CASE WHEN MIN(qr.[Status]) <> 2 AND MAX(qr.RunnableCount) > 2 AND @RunnableCountAvg > 1
THEN CONVERT(nvarchar(8),N'CPUWait ')
ELSE N'' END +
CASE WHEN MAX(t.CursorOpen) > 0 AND MAX(t.CursorDormantms) >= 1
THEN CONVERT(nvarchar(27),N'Cursor(' + CONVERT(nvarchar(16),MAX(t.CursorDormantms)) + N'ms) ')
ELSE N'' END +
CASE WHEN MAX(qr.EstFinishTime) >= 1
THEN CONVERT(nvarchar(41),REPLACE(MAX(qr.DatabaseMaint),N' ',N'~')) + N'('
+ (CASE WHEN (MAX(qr.EstFinishTime) / 60000) > 600
THEN N'>10hr) '
ELSE CONVERT(nvarchar(3),MAX(qr.EstFinishTime) / 60000) + N'min) '
END)
ELSE N'' END +
CASE WHEN MAX(qr.query_cost) >= 10 AND MAX(qp.[AvgMissingIndex%]) > 20
THEN CONVERT(nvarchar(7),N'IdxGap ')
ELSE N'' END +
CASE WHEN CHARINDEX(N'[',MAX(sl.SessionLocks)) > 0
THEN CONVERT(nvarchar(8),N'IdxIdle ')
ELSE N'' END +
CASE WHEN SUM(qr.MemGrantMB) > CONVERT(float,SUM(qr.MemRequestMB) + 0.00001)
THEN CONVERT(nvarchar(32),N'InitialMem(') + CONVERT(nvarchar(17),CONVERT(numeric(16,2),SUM(qr.MemRequestMB))) + N'MB) '
ELSE N'' END +
CASE WHEN MAX([PhyReads%]) > CONVERT(float,20.0)
OR (MAX(qr.query_cost) >= 10 AND @PendingIOCountAvg > 1 AND (MAX([PhyReads%]) > CONVERT(float,5.0) OR MAX(qr.PAGEIOLATCHms) > 50))
THEN (CASE WHEN (@ProcessMemLow + @SystemMemLow) > 0
THEN CONVERT(nvarchar(9),N'IO(MemP) ')
ELSE CONVERT(nvarchar(9),N'IO ')
END)
ELSE N'' END +
CASE WHEN 0 < CHARINDEX(N'(WAIT',MAX(sl.SessionLocks))
THEN CONVERT(nvarchar(9),N'LockWait ')
ELSE N'' END +
CASE WHEN MAX(qr.MemGrantWait) = 1
THEN CONVERT(nvarchar(8),N'MemWait ')
ELSE N'' END +
CASE WHEN MAX(qp.MissingJoin) > 0
THEN CONVERT(nvarchar(9),N'MissJoin ')
ELSE N'' END +
CASE WHEN MAX(qr.PAGELATCHms) >= 1
THEN CONVERT(nvarchar(23),N'PageWait(' + CONVERT(nvarchar(10),MAX(qr.PAGELATCHms)) + N'ms) ')
ELSE N'' END +
CASE WHEN MAX(qp.ParameterList) <> N'' AND UPPER(MAX(qp.PlanType)) IN (N'PROC',N'ADHOC') AND MAX(qs.RunCount) > 1
AND ( CONVERT(float,MAX(qs.MaxRows) / 10.0) > CONVERT(float,((MAX(qs.MinRows) / 10.0) * (4.0 * @ParamSniff)) + POWER(CONVERT(float,10.0),@ParamSniff))
OR (MAX([PhyReads%]) > CONVERT(float,20.0)
OR (MAX(qr.query_cost) >= 10 AND @PendingIOCountAvg > 1 AND (MAX([PhyReads%]) > CONVERT(float,5.0) OR MAX(qr.PAGEIOLATCHms) > 50)))
OR ((MAX(t.TempdbAllocMB) - MAX(t.TempdbDeallocMB))
> (CASE WHEN CONVERT(int,(SUM(qr.MemGrantMB) / 10) * ((100 - ISNULL(MAX(qp.[AvgMissingIndex%]),0)) / 100)) > 49
THEN CONVERT(int,50)
ELSE 1 + CONVERT(int,(SUM(qr.MemGrantMB) / 10) * ((100 - ISNULL(MAX(qp.[AvgMissingIndex%]),0)) / 100))
END)))
AND CONVERT(float,MAX(qs.CpuHighms) / 10.0) > CONVERT(float,((MAX(qs.AvgCpuLowms) / 10.0) * (4.0 * @ParamSniff)) + POWER(CONVERT(float,10.0),@ParamSniff))
AND ((CASE WHEN MAX(qr.RuntimeSec) > MAX(qs.MaxTimeSec) THEN MAX(qr.RuntimeSec) ELSE MAX(qs.MaxTimeSec) END) - MAX(qs.MinTimeSec))
> ((MAX(qs.MinTimeSec) / 10) + POWER(CONVERT(bigint,10),@ParamSniff))
THEN CONVERT(nvarchar(37),N'ParamSniff(') + CONVERT(nvarchar(10),MAX(qs.MinTimeSec)) + N'-'
+ CONVERT(nvarchar(10),(CASE WHEN MAX(qr.RuntimeSec) > MAX(qs.MaxTimeSec) THEN MAX(qr.RuntimeSec) ELSE MAX(qs.MaxTimeSec) END)) + N'Sec) '
ELSE N'' END +
CASE WHEN MAX(qr.SpinloopFlag) = 1
THEN CONVERT(nvarchar(9),N'SpinLoop ')
ELSE N'' END +
CASE WHEN (MAX(t.TempdbAllocMB) - MAX(t.TempdbDeallocMB))
> (CASE WHEN CONVERT(int,(SUM(qr.MemGrantMB) / 10) * ((100 - ISNULL(MAX(qp.[AvgMissingIndex%]),0)) / 100)) > 49
THEN CONVERT(int,50)
ELSE 1 + CONVERT(int,(SUM(qr.MemGrantMB) / 10) * ((100 - ISNULL(MAX(qp.[AvgMissingIndex%]),0)) / 100))
END)
THEN CONVERT(nvarchar(27),N'Tempdb')
+ (CASE WHEN MAX(t.TempdbWaitms) >= 1 THEN N'(' + CONVERT(nvarchar(16),MAX(t.TempdbWaitms)) + N'ms) ' ELSE N' ' END)
ELSE N'' END +
CASE WHEN MAX(qr.ThreadShortageFlag) = 1 AND @ThreadShortageAvg > 0
THEN CONVERT(nvarchar(15),N'ThreadShortage ')
ELSE N'' END +
CASE WHEN @VerCleanupRatio < CONVERT(float,80.0) AND MAX(t.VerDuration) >= 1
THEN CONVERT(nvarchar(25),N'Ver(') + CONVERT(nvarchar(16),MAX(t.VerDuration)) + N'sec) '
ELSE N'' END
)),N' ',N','),N'~',N' ')) as ThrottlePotential,
MAX(qr.RuntimeSec) as RuntimeSec,
CONVERT(nvarchar(50),
STUFF((SELECT N',' + CONVERT(nvarchar(50),qr2.BlockedBy)
FROM cteQRequests qr2
WHERE qr2.SPID = qr.SPID
AND qr2.BlockedBy IS NOT NULL
GROUP BY CONVERT(nvarchar(50),qr2.BlockedBy)
FOR XML PATH('')),1,1,N''))
as BlockedBy,
(SELECT CONVERT(nvarchar(max),
SUBSTRING(qt.text+' ',(MAX(qr.statement_start_offset) / 2) + 1,
((CASE WHEN MAX(qr.statement_end_offset) = -1
THEN DATALENGTH(qt.text)
ELSE MAX(qr.statement_end_offset)
END - MAX(qr.statement_start_offset)) / 2) + 1))
FROM sys.dm_exec_sql_text(qr.sql_handle) qt)
as Query,
MAX(qr.MemGrantMB) as MemGrantMB,
MAX(qs.RunCount) as RunCount,
MAX(qs.MinRows) as MinRows,
MAX(qs.MaxRows) as MaxRows,
MAX(qs.AvgCpuLowms) as AvgCpuLowms,
MAX(qs.CpuHighms) as CpuHighms,
MAX(qr.DOP) as DOP,
MAX(qs.AvgLogicalReadsMB) as AvgLogicalReadsMB,
(CASE WHEN MAX(qs.RunCount) IS NOT NULL THEN MAX(qs.[PhyReads%]) ELSE CONVERT(float,NULL) END)
as [PhyReads%],
MAX(qr.PAGEIOLATCHms) as PAGEIOLATCHms,
MAX(sl.SessionLocks) as SessionLocks,
MAX(t.VerActive) as VerActive,
MAX(t.TempdbAllocMB) as TempdbAllocMB,
MAX(t.TempdbDeallocMB) as TempdbDeallocMB,
MAX(qp.Cardinality) as Cardinality,
MAX(qp.[AvgMissingIndex%]) as [AvgMissingIndex%],
MAX(qp.SortRows) as SortRows,
MAX(qp.TableScanRows) as TableScanRows,
MAX(qp.ParameterList) as CachedParam,
(SELECT top 1 query_plan FROM sys.dm_exec_query_plan(qr.plan_handle))
as CachedPlan,
MAX(qr.ProgramName) as ProgramName,
MAX(qr.OriginalLogin) as OriginalLogin,
@Runtime as LogDateTime
FROM cteQRequests qr
LEFT JOIN cteQPlan qp
ON qp.plan_handle = qr.plan_handle
LEFT JOIN cteQStats qs
ON qs.sql_handle = qr.sql_handle
AND qs.plan_handle = qr.plan_handle
LEFT JOIN cteSLocks sl
ON sl.SPID = qr.SPID
LEFT JOIN cteTempdb t
ON t.SPID = qr.SPID
GROUP BY qr.SPID,
qr.sql_handle,
qr.plan_handle
HAVING (SELECT CONVERT(nvarchar(max),
SUBSTRING(qt.text+' ',(MAX(qr.statement_start_offset) / 2) + 1,
((CASE WHEN MAX(qr.statement_end_offset) = -1
THEN DATALENGTH(qt.text)
ELSE MAX(qr.statement_end_offset)
END - MAX(qr.statement_start_offset)) / 2) + 1))
FROM sys.dm_exec_sql_text(qr.sql_handle) qt) IS NOT NULL
ORDER BY qr.SPID
END
GO 
