Statistik über aufgetretene Wait Types

Wenn dieser Artikel gepostet wird, befind ich mich schon im Urlaub und somit auf meiner Reise in den Kaukasus.
Aber ich habe schon vorab ein interessantes Skript vorbereitet:
Dieses Skript summiert die aufgetretenen Waits nach Typ auf und zeigt an, wie oft sie auftreten, wie lange gewartet wurde, stellt sie in prozentualer Relation dar und berechnet auch die durchschnittliche Wartezeit.
Anhand dieser Liste bekommt man oft einen Überblick, wo es am MS SQL Server kränkelt. Einen Artikel über die diversen Wait-Types, welche gut und welche böse sind, werde ich nach meiner Rückkehr verfassen.

Syntax:

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 (
        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'
       ,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'
       ,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'ONDEMAND_TASK_QUEUE'
       ,N'PWAIT_ALL_COMPONENTS_INITIALIZED'
       ,N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP'
       ,N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP'
       ,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'SP_SERVER_DIAGNOSTICS_SLEEP'     
       ,N'SQLTRACE_BUFFER_FLUSH'
       ,N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP'
       ,N'SQLTRACE_WAIT_ENTRIES'           
       ,N'WAIT_FOR_RESULTS'
       ,N'WAITFOR'                         
       ,N'WAITFOR_TASKSHUTDOWN'
       ,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
;