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       #Post#: 117--------------------------------------------------
       Analyze the wait stats
       By: srinivasma_exceldbp Date: December 25, 2014, 3:56 am
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       -- Analyze the wait stats
       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 (
       'CLR_SEMAPHORE', 'LAZYWRITER_SLEEP', 'RESOURCE_QUEUE',
       'SLEEP_TASK',
       'SLEEP_SYSTEMTASK', 'SQLTRACE_BUFFER_FLUSH', 'WAITFOR',
       'LOGMGR_QUEUE',
       'CHECKPOINT_QUEUE', 'REQUEST_FOR_DEADLOCK_SEARCH',
       'XE_TIMER_EVENT', 'BROKER_TO_FLUSH',
       'BROKER_TASK_STOP', 'CLR_MANUAL_EVENT',
       'CLR_AUTO_EVENT', 'DISPATCHER_QUEUE_SEMAPHORE',
       'FT_IFTS_SCHEDULER_IDLE_WAIT', 'XE_DISPATCHER_WAIT',
       'XE_DISPATCHER_JOIN', 'BROKER_EVENTHANDLER',
       'TRACEWRITE', 'FT_IFTSHC_MUTEX',
       'SQLTRACE_INCREMENTAL_FLUSH_SLEEP',
       'BROKER_RECEIVE_WAITFOR', 'ONDEMAND_TASK_QUEUE',
       'DBMIRROR_EVENTS_QUEUE',
       'DBMIRRORING_CMD', 'BROKER_TRANSMITTER',
       'SQLTRACE_WAIT_ENTRIES',
       'SLEEP_BPOOL_FLUSH', 'SQLTRACE_LOCK')
       )
       SELECT
       W1.wait_type AS WaitType,
       CAST (W1.WaitS AS DECIMAL(14, 2)) AS Wait_S,
       CAST (W1.ResourceS AS DECIMAL(14, 2)) AS Resource_S,
       CAST (W1.SignalS AS DECIMAL(14, 2)) AS Signal_S,
       W1.WaitCount AS WaitCount,
       CAST (W1.Percentage AS DECIMAL(4, 2)) AS Percentage,
       CAST ((W1.WaitS / W1.WaitCount) AS DECIMAL (14, 4)) AS
       AvgWait_S,
       CAST ((W1.ResourceS / W1.WaitCount) AS DECIMAL (14, 4)) AS
       AvgRes_S,
       CAST ((W1.SignalS / W1.WaitCount) AS DECIMAL (14, 4)) AS
       AvgSig_S
       FROM Waits AS W1
       INNER JOIN Waits AS W2 ON W2.RowNum <= W1.RowNum
       GROUP BY W1.RowNum, W1.wait_type, W1.WaitS, W1.ResourceS,
       W1.SignalS, W1.WaitCount, W1.Percentage
       HAVING SUM (W2.Percentage) - W1.Percentage < 95; -- percentage
       threshold
       GO
       -- Analyze which thread is waiting on which wait type
       SELECT
       owt.session_id,
       owt.wait_duration_ms,
       owt.wait_type,
       owt.blocking_session_id,
       owt.resource_description,
       es.program_name,
       est.text,
       est.dbid,
       eqp.query_plan,
       es.cpu_time,
       es.memory_usage
       FROM sys.dm_os_waiting_tasks owt
       INNER JOIN sys.dm_exec_sessions es ON owt.session_id =
       es.session_id
       INNER JOIN sys.dm_exec_requests er ON es.session_id =
       er.session_id
       OUTER APPLY sys.dm_exec_sql_text(er.sql_handle) est
       OUTER APPLY sys.dm_exec_query_plan(er.plan_handle) eqp
       WHERE es.is_user_process = 1
       GO
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