Paul Randall's utmärkta script för waits

Detta script är det Paul Randall som ligger bakom, ett väldigt bra script med länkar till tips och förklaringar av olika waits.

Original sidan finns här

https://www.sqlskills.com/blogs/paul/wait-statistics-or-please-tell-me-where-it-hurts/

-- Last updated September 25, 2018
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', -- https://www.sqlskills.com/help/waits/BROKER_EVENTHANDLER
        N'BROKER_RECEIVE_WAITFOR', -- https://www.sqlskills.com/help/waits/BROKER_RECEIVE_WAITFOR
        N'BROKER_TASK_STOP', -- https://www.sqlskills.com/help/waits/BROKER_TASK_STOP
        N'BROKER_TO_FLUSH', -- https://www.sqlskills.com/help/waits/BROKER_TO_FLUSH
        N'BROKER_TRANSMITTER', -- https://www.sqlskills.com/help/waits/BROKER_TRANSMITTER
        N'CHECKPOINT_QUEUE', -- https://www.sqlskills.com/help/waits/CHECKPOINT_QUEUE
        N'CHKPT', -- https://www.sqlskills.com/help/waits/CHKPT
        N'CLR_AUTO_EVENT', -- https://www.sqlskills.com/help/waits/CLR_AUTO_EVENT
        N'CLR_MANUAL_EVENT', -- https://www.sqlskills.com/help/waits/CLR_MANUAL_EVENT
        N'CLR_SEMAPHORE', -- https://www.sqlskills.com/help/waits/CLR_SEMAPHORE
        N'CXCONSUMER', -- https://www.sqlskills.com/help/waits/CXCONSUMER
    -- Maybe comment these four out if you have mirroring issues
    N'DBMIRROR_DBM_EVENT', -- https://www.sqlskills.com/help/waits/DBMIRROR_DBM_EVENT
    N'DBMIRROR_EVENTS_QUEUE', -- https://www.sqlskills.com/help/waits/DBMIRROR_EVENTS_QUEUE
    N'DBMIRROR_WORKER_QUEUE', -- https://www.sqlskills.com/help/waits/DBMIRROR_WORKER_QUEUE
    N'DBMIRRORING_CMD', -- https://www.sqlskills.com/help/waits/DBMIRRORING_CMD

    N'DIRTY_PAGE_POLL', -- https://www.sqlskills.com/help/waits/DIRTY_PAGE_POLL
    N'DISPATCHER_QUEUE_SEMAPHORE', -- https://www.sqlskills.com/help/waits/DISPATCHER_QUEUE_SEMAPHORE
    N'EXECSYNC', -- https://www.sqlskills.com/help/waits/EXECSYNC
    N'FSAGENT', -- https://www.sqlskills.com/help/waits/FSAGENT
    N'FT_IFTS_SCHEDULER_IDLE_WAIT', -- https://www.sqlskills.com/help/waits/FT_IFTS_SCHEDULER_IDLE_WAIT
    N'FT_IFTSHC_MUTEX', -- https://www.sqlskills.com/help/waits/FT_IFTSHC_MUTEX

    -- Maybe comment these six out if you have AG issues
    N'HADR_CLUSAPI_CALL', -- https://www.sqlskills.com/help/waits/HADR_CLUSAPI_CALL
    N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', -- https://www.sqlskills.com/help/waits/HADR_FILESTREAM_IOMGR_IOCOMPLETION
    N'HADR_LOGCAPTURE_WAIT', -- https://www.sqlskills.com/help/waits/HADR_LOGCAPTURE_WAIT
    N'HADR_NOTIFICATION_DEQUEUE', -- https://www.sqlskills.com/help/waits/HADR_NOTIFICATION_DEQUEUE
    N'HADR_TIMER_TASK', -- https://www.sqlskills.com/help/waits/HADR_TIMER_TASK
    N'HADR_WORK_QUEUE', -- https://www.sqlskills.com/help/waits/HADR_WORK_QUEUE

    N'KSOURCE_WAKEUP', -- https://www.sqlskills.com/help/waits/KSOURCE_WAKEUP
    N'LAZYWRITER_SLEEP', -- https://www.sqlskills.com/help/waits/LAZYWRITER_SLEEP
    N'LOGMGR_QUEUE', -- https://www.sqlskills.com/help/waits/LOGMGR_QUEUE
    N'MEMORY_ALLOCATION_EXT', -- https://www.sqlskills.com/help/waits/MEMORY_ALLOCATION_EXT
    N'ONDEMAND_TASK_QUEUE', -- https://www.sqlskills.com/help/waits/ONDEMAND_TASK_QUEUE
    N'PARALLEL_REDO_DRAIN_WORKER', -- https://www.sqlskills.com/help/waits/PARALLEL_REDO_DRAIN_WORKER
    N'PARALLEL_REDO_LOG_CACHE', -- https://www.sqlskills.com/help/waits/PARALLEL_REDO_LOG_CACHE
    N'PARALLEL_REDO_TRAN_LIST', -- https://www.sqlskills.com/help/waits/PARALLEL_REDO_TRAN_LIST
    N'PARALLEL_REDO_WORKER_SYNC', -- https://www.sqlskills.com/help/waits/PARALLEL_REDO_WORKER_SYNC
    N'PARALLEL_REDO_WORKER_WAIT_WORK', -- https://www.sqlskills.com/help/waits/PARALLEL_REDO_WORKER_WAIT_WORK
    N'PREEMPTIVE_XE_GETTARGETSTATE', -- https://www.sqlskills.com/help/waits/PREEMPTIVE_XE_GETTARGETSTATE
    N'PWAIT_ALL_COMPONENTS_INITIALIZED', -- https://www.sqlskills.com/help/waits/PWAIT_ALL_COMPONENTS_INITIALIZED
    N'PWAIT_DIRECTLOGCONSUMER_GETNEXT', -- https://www.sqlskills.com/help/waits/PWAIT_DIRECTLOGCONSUMER_GETNEXT
    N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP', -- https://www.sqlskills.com/help/waits/QDS_PERSIST_TASK_MAIN_LOOP_SLEEP
    N'QDS_ASYNC_QUEUE', -- https://www.sqlskills.com/help/waits/QDS_ASYNC_QUEUE
    N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP',
        -- https://www.sqlskills.com/help/waits/QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP
    N'QDS_SHUTDOWN_QUEUE', -- https://www.sqlskills.com/help/waits/QDS_SHUTDOWN_QUEUE
    N'REDO_THREAD_PENDING_WORK', -- https://www.sqlskills.com/help/waits/REDO_THREAD_PENDING_WORK
    N'REQUEST_FOR_DEADLOCK_SEARCH', -- https://www.sqlskills.com/help/waits/REQUEST_FOR_DEADLOCK_SEARCH
    N'RESOURCE_QUEUE', -- https://www.sqlskills.com/help/waits/RESOURCE_QUEUE
    N'SERVER_IDLE_CHECK', -- https://www.sqlskills.com/help/waits/SERVER_IDLE_CHECK
    N'SLEEP_BPOOL_FLUSH', -- https://www.sqlskills.com/help/waits/SLEEP_BPOOL_FLUSH
    N'SLEEP_DBSTARTUP', -- https://www.sqlskills.com/help/waits/SLEEP_DBSTARTUP
    N'SLEEP_DCOMSTARTUP', -- https://www.sqlskills.com/help/waits/SLEEP_DCOMSTARTUP
    N'SLEEP_MASTERDBREADY', -- https://www.sqlskills.com/help/waits/SLEEP_MASTERDBREADY
    N'SLEEP_MASTERMDREADY', -- https://www.sqlskills.com/help/waits/SLEEP_MASTERMDREADY
    N'SLEEP_MASTERUPGRADED', -- https://www.sqlskills.com/help/waits/SLEEP_MASTERUPGRADED
    N'SLEEP_MSDBSTARTUP', -- https://www.sqlskills.com/help/waits/SLEEP_MSDBSTARTUP
    N'SLEEP_SYSTEMTASK', -- https://www.sqlskills.com/help/waits/SLEEP_SYSTEMTASK
    N'SLEEP_TASK', -- https://www.sqlskills.com/help/waits/SLEEP_TASK
    N'SLEEP_TEMPDBSTARTUP', -- https://www.sqlskills.com/help/waits/SLEEP_TEMPDBSTARTUP
    N'SNI_HTTP_ACCEPT', -- https://www.sqlskills.com/help/waits/SNI_HTTP_ACCEPT
    N'SOS_WORK_DISPATCHER', -- https://www.sqlskills.com/help/waits/SOS_WORK_DISPATCHER
    N'SP_SERVER_DIAGNOSTICS_SLEEP', -- https://www.sqlskills.com/help/waits/SP_SERVER_DIAGNOSTICS_SLEEP
    N'SQLTRACE_BUFFER_FLUSH', -- https://www.sqlskills.com/help/waits/SQLTRACE_BUFFER_FLUSH
    N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP', -- https://www.sqlskills.com/help/waits/SQLTRACE_INCREMENTAL_FLUSH_SLEEP
    N'SQLTRACE_WAIT_ENTRIES', -- https://www.sqlskills.com/help/waits/SQLTRACE_WAIT_ENTRIES
    N'WAIT_FOR_RESULTS', -- https://www.sqlskills.com/help/waits/WAIT_FOR_RESULTS
    N'WAITFOR', -- https://www.sqlskills.com/help/waits/WAITFOR
    N'WAITFOR_TASKSHUTDOWN', -- https://www.sqlskills.com/help/waits/WAITFOR_TASKSHUTDOWN
    N'WAIT_XTP_RECOVERY', -- https://www.sqlskills.com/help/waits/WAIT_XTP_RECOVERY
    N'WAIT_XTP_HOST_WAIT', -- https://www.sqlskills.com/help/waits/WAIT_XTP_HOST_WAIT
    N'WAIT_XTP_OFFLINE_CKPT_NEW_LOG', -- https://www.sqlskills.com/help/waits/WAIT_XTP_OFFLINE_CKPT_NEW_LOG
    N'WAIT_XTP_CKPT_CLOSE', -- https://www.sqlskills.com/help/waits/WAIT_XTP_CKPT_CLOSE
    N'XE_DISPATCHER_JOIN', -- https://www.sqlskills.com/help/waits/XE_DISPATCHER_JOIN
    N'XE_DISPATCHER_WAIT', -- https://www.sqlskills.com/help/waits/XE_DISPATCHER_WAIT
    N'XE_TIMER_EVENT' -- https://www.sqlskills.com/help/waits/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],
CAST ('https://www.sqlskills.com/help/waits/' + MAX ([W1].[wait_type]) as XML) AS [Help/Info URL]
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