WITH [Waits] AS
(SELECT
[wait_type],
[wait_time_ms] / 1000.0 AS [WaitS],
([wait_time_ms] - [signal_wait_time_ms]) / 1000.0 AS [ResourceS],
[signal_wait_time_ms] / 1000.0 AS [SignalS],
[waiting_tasks_count] AS [WaitCount],
100.0 * [wait_time_ms] / SUM ([wait_time_ms]) OVER() AS [Percentage],
ROW_NUMBER() OVER(ORDER BY [wait_time_ms] DESC) AS [RowNum]
FROM sys.dm_os_wait_stats
WHERE [wait_type] NOT IN (
-- These wait types are almost 100% never a problem and so they are
-- filtered out to avoid them skewing the results. Click on the URL
-- for more information.
N'BROKER_EVENTHANDLER',
N'BROKER_RECEIVE_WAITFOR',
N'BROKER_TASK_STOP',
N'BROKER_TO_FLUSH',
N'BROKER_TRANSMITTER',
N'CHECKPOINT_QUEUE',
N'CHKPT',
N'CLR_AUTO_EVENT',
N'CLR_MANUAL_EVENT',
N'CLR_SEMAPHORE',
-- Maybe comment this out if you have parallelism issues
N'CXCONSUMER',
-- Maybe comment these four out if you have mirroring issues
N'DBMIRROR_DBM_EVENT',
N'DBMIRROR_EVENTS_QUEUE',
N'DBMIRROR_WORKER_QUEUE',
N'DBMIRRORING_CMD',
N'DIRTY_PAGE_POLL',
N'DISPATCHER_QUEUE_SEMAPHORE',
N'EXECSYNC',
N'FSAGENT',
N'FT_IFTS_SCHEDULER_IDLE_WAIT',
N'FT_IFTSHC_MUTEX',
-- Maybe comment these six out if you have AG issues
N'HADR_CLUSAPI_CALL',
N'HADR_FILESTREAM_IOMGR_IOCOMPLETION',
N'HADR_LOGCAPTURE_WAIT',
N'HADR_NOTIFICATION_DEQUEUE',
N'HADR_TIMER_TASK',
N'HADR_WORK_QUEUE',
N'KSOURCE_WAKEUP',
N'LAZYWRITER_SLEEP',
N'LOGMGR_QUEUE',
N'MEMORY_ALLOCATION_EXT',
N'ONDEMAND_TASK_QUEUE',
N'PARALLEL_REDO_DRAIN_WORKER',
N'PARALLEL_REDO_LOG_CACHE',
N'PARALLEL_REDO_TRAN_LIST',
N'PARALLEL_REDO_WORKER_SYNC',
N'PARALLEL_REDO_WORKER_WAIT_WORK',
N'PREEMPTIVE_OS_FLUSHFILEBUFFERS',
N'PREEMPTIVE_XE_GETTARGETSTATE',
N'PWAIT_ALL_COMPONENTS_INITIALIZED',
N'PWAIT_DIRECTLOGCONSUMER_GETNEXT',
N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP',
N'QDS_ASYNC_QUEUE',
N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP',
N'QDS_SHUTDOWN_QUEUE',
N'REDO_THREAD_PENDING_WORK',
N'REQUEST_FOR_DEADLOCK_SEARCH',
N'RESOURCE_QUEUE',
N'SERVER_IDLE_CHECK',
N'SLEEP_BPOOL_FLUSH',
N'SLEEP_DBSTARTUP',
N'SLEEP_DCOMSTARTUP',
N'SLEEP_MASTERDBREADY',
N'SLEEP_MASTERMDREADY',
N'SLEEP_MASTERUPGRADED',
N'SLEEP_MSDBSTARTUP',
N'SLEEP_SYSTEMTASK',
N'SLEEP_TASK',
N'SLEEP_TEMPDBSTARTUP',
N'SNI_HTTP_ACCEPT',
N'SOS_WORK_DISPATCHER',
N'SP_SERVER_DIAGNOSTICS_SLEEP',
N'SQLTRACE_BUFFER_FLUSH',
N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP',
N'SQLTRACE_WAIT_ENTRIES',
N'VDI_CLIENT_OTHER',
N'WAIT_FOR_RESULTS',
N'WAITFOR',
N'WAITFOR_TASKSHUTDOWN',
N'WAIT_XTP_RECOVERY',
N'WAIT_XTP_HOST_WAIT',
N'WAIT_XTP_OFFLINE_CKPT_NEW_LOG',
N'WAIT_XTP_CKPT_CLOSE',
N'XE_DISPATCHER_JOIN',
N'XE_DISPATCHER_WAIT',
N'XE_TIMER_EVENT'
)
AND [waiting_tasks_count] > 0
)
SELECT
MAX ([W1].[wait_type]) AS [WaitType],
CAST (MAX ([W1].[WaitS]) AS DECIMAL (16,2)) AS [Wait_S],
CAST (MAX ([W1].[ResourceS]) AS DECIMAL (16,2)) AS [Resource_S],
CAST (MAX ([W1].[SignalS]) AS DECIMAL (16,2)) AS [Signal_S],
MAX ([W1].[WaitCount]) AS [WaitCount],
CAST (MAX ([W1].[Percentage]) AS DECIMAL (5,2)) AS [Percentage],
CAST ((MAX ([W1].[WaitS]) / MAX ([W1].[WaitCount])) AS DECIMAL (16,4)) AS [AvgWait_S],
CAST ((MAX ([W1].[ResourceS]) / MAX ([W1].[WaitCount])) AS DECIMAL (16,4)) AS [AvgRes_S],
CAST ((MAX ([W1].[SignalS]) / MAX ([W1].[WaitCount])) AS DECIMAL (16,4)) AS [AvgSig_S]
FROM [Waits] AS [W1]
INNER JOIN [Waits] AS [W2] ON [W2].[RowNum] <= [W1].[RowNum]
GROUP BY [W1].[RowNum]
HAVING SUM ([W2].[Percentage]) - MAX( [W1].[Percentage] ) < 95; -- percentage threshold
GO
