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I received results for a whopping 1,823 SQL Servers out there – thank you!

Here’s a graphical view of the results: I’m not surprised at all by the top four results as I see these over and over on client systems.

Once you get the results, you then start figuring out how to interpret them and where to go looking.

See below for the most recent version of my script, as of 2018, that works on all versions and includes wait types for SQL Server 2017.Note: This script does NOT work on Azure SQL Database – you need to replace -- Last updated June 13, 2018 WITH [Waits] AS (SELECT [wait_type], [wait_time_ms] / 1000.0 AS [Wait S], ([wait_time_ms] - [signal_wait_time_ms]) / 1000.0 AS [Resource S], [signal_wait_time_ms] / 1000.0 AS [Signal S], [waiting_tasks_count] AS [Wait Count], 100.0 * [wait_time_ms] / SUM ([wait_time_ms]) OVER() AS [Percentage], ROW_NUMBER() OVER(ORDER BY [wait_time_ms] DESC) AS [Row Num] 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. N'BROKER_EVENTHANDLER', -- https:// N'BROKER_RECEIVE_WAITFOR', -- https:// N'BROKER_TASK_STOP', -- https:// N'BROKER_TO_FLUSH', -- https:// N'BROKER_TRANSMITTER', -- https:// N'CHECKPOINT_QUEUE', -- https:// N'CHKPT', -- https:// N'CLR_AUTO_EVENT', -- https:// N'CLR_MANUAL_EVENT', -- https:// N'CLR_SEMAPHORE', -- https:// N'CXCONSUMER', -- https:// -- Maybe comment these four out if you have mirroring issues N'DBMIRROR_DBM_EVENT', -- https:// N'DBMIRROR_EVENTS_QUEUE', -- https:// N'DBMIRROR_WORKER_QUEUE', -- https:// N'DBMIRRORING_CMD', -- https:// N'DIRTY_PAGE_POLL', -- https:// N'DISPATCHER_QUEUE_SEMAPHORE', -- https:// N'EXECSYNC', -- https:// N'FSAGENT', -- https:// N'FT_IFTS_SCHEDULER_IDLE_WAIT', -- https:// N'FT_IFTSHC_MUTEX', -- https:// -- Maybe comment these six out if you have AG issues N'HADR_CLUSAPI_CALL', -- https:// N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', -- https:// N'HADR_LOGCAPTURE_WAIT', -- https:// N'HADR_NOTIFICATION_DEQUEUE', -- https:// N'HADR_TIMER_TASK', -- https:// N'HADR_WORK_QUEUE', -- https:// N'KSOURCE_WAKEUP', -- https:// N'LAZYWRITER_SLEEP', -- https:// N'LOGMGR_QUEUE', -- https:// N'MEMORY_ALLOCATION_EXT', -- https:// N'ONDEMAND_TASK_QUEUE', -- https:// N'PARALLEL_REDO_DRAIN_WORKER', -- https:// N'PARALLEL_REDO_LOG_CACHE', -- https:// N'PARALLEL_REDO_TRAN_LIST', -- https:// N'PARALLEL_REDO_WORKER_SYNC', -- https:// N'PARALLEL_REDO_WORKER_WAIT_WORK', -- https:// N'PREEMPTIVE_XE_GETTARGETSTATE', -- https:// N'PWAIT_ALL_COMPONENTS_INITIALIZED', -- https:// N'PWAIT_DIRECTLOGCONSUMER_GETNEXT', -- https:// N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP', -- https:// N'QDS_ASYNC_QUEUE', -- https:// N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP', -- https:// N'QDS_SHUTDOWN_QUEUE', -- https:// N'REDO_THREAD_PENDING_WORK', -- https:// N'REQUEST_FOR_DEADLOCK_SEARCH', -- https:// N'RESOURCE_QUEUE', -- https:// N'SERVER_IDLE_CHECK', -- https:// N'SLEEP_BPOOL_FLUSH', -- https:// N'SLEEP_DBSTARTUP', -- https:// N'SLEEP_DCOMSTARTUP', -- https:// N'SLEEP_MASTERDBREADY', -- https:// N'SLEEP_MASTERMDREADY', -- https:// N'SLEEP_MASTERUPGRADED', -- https:// N'SLEEP_MSDBSTARTUP', -- https:// N'SLEEP_SYSTEMTASK', -- https:// N'SLEEP_TASK', -- https:// N'SLEEP_TEMPDBSTARTUP', -- https:// N'SNI_HTTP_ACCEPT', -- https:// N'SP_SERVER_DIAGNOSTICS_SLEEP', -- https:// N'SQLTRACE_BUFFER_FLUSH', -- https:// N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP', -- https:// N'SQLTRACE_WAIT_ENTRIES', -- https:// N'WAIT_FOR_RESULTS', -- https:// N'WAITFOR', -- https:// N'WAITFOR_TASKSHUTDOWN', -- https:// N'WAIT_XTP_RECOVERY', -- https:// N'WAIT_XTP_HOST_WAIT', -- https:// N'WAIT_XTP_OFFLINE_CKPT_NEW_LOG', -- https:// N'WAIT_XTP_CKPT_CLOSE', -- https:// N'XE_DISPATCHER_JOIN', -- https:// N'XE_DISPATCHER_WAIT', -- https:// N'XE_TIMER_EVENT' -- https:// ) AND [waiting_tasks_count] 0 ) SELECT MAX ([W1].[wait_type]) AS [Wait Type], CAST (MAX ([W1].[Wait S]) AS DECIMAL (16,2)) AS [Wait_S], CAST (MAX ([W1].[Resource S]) AS DECIMAL (16,2)) AS [Resource_S], CAST (MAX ([W1].[Signal S]) AS DECIMAL (16,2)) AS [Signal_S], MAX ([W1].[Wait Count]) AS [Wait Count], CAST (MAX ([W1].[Percentage]) AS DECIMAL (5,2)) AS [Percentage], CAST ((MAX ([W1].[Wait S]) / MAX ([W1].[Wait Count])) AS DECIMAL (16,4)) AS [Avg Wait_S], CAST ((MAX ([W1].[Resource S]) / MAX ([W1].[Wait Count])) AS DECIMAL (16,4)) AS [Avg Res_S], CAST ((MAX ([W1].[Signal S]) / MAX ([W1].[Wait Count])) AS DECIMAL (16,4)) AS [Avg Sig_S], CAST ('https:// MAX ([W1].[wait_type]) as XML) AS [Help/Info URL] FROM [Waits] AS [W1] INNER JOIN [Waits] AS [W2] ON [W2].[Row Num] This will show the waits grouped together as a percentage of all waits on the system, in decreasing order.You can see processes in these states using the DMV.SQL Server keeps track of the time that elapses between leaving the RUNNING state and becoming RUNNING again (called the “wait time”) and the time spent on the RUNNABLE queue (called the “signal wait time” – i.e.The basic premise is that SQL Server is permanently tracking why execution threads have to wait.

You can ask SQL Server for this information and then use the results to narrow down where to start digging to unearth the cause of performance issues. The “queues” are the resources that the threads are waiting for.

The list below shows all the waits reported in the survey results, along with a clickable link that will take you to the wait’s page in my waits library.

I did another survey in 2014 that showed some interesting changes – see here for details.

and my comprehensive library of all wait types and latch classes.) [Last updated: June 13, 2018] How many times have you walked up to a SQL Server that has a performance problem and wondered where to start looking?

One of the most under-utilized performance troubleshooting methodologies in the SQL Server world is one called “waits and queues” (also known simply as “wait stats”).

There are a myriad of waits in the system and they all indicate different resources being waited for.