--清除等待統計

--===================================================== --清除等待統計 DBCC SQLPERF (N'sys.dm_os_wait_stats', CLEAR); GO

--通用的查看等待

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_statsWHERE [wait_type] NOT IN (N'CLR_SEMAPHORE', N'LAZYWRITER_SLEEP',N'RESOURCE_QUEUE', N'SQLTRACE_BUFFER_FLUSH',N'SLEEP_TASK', N'SLEEP_SYSTEMTASK',N'WAITFOR', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION',N'CHECKPOINT_QUEUE', N'REQUEST_FOR_DEADLOCK_SEARCH',N'XE_TIMER_EVENT', N'XE_DISPATCHER_JOIN',N'LOGMGR_QUEUE', N'FT_IFTS_SCHEDULER_IDLE_WAIT',N'BROKER_TASK_STOP', N'CLR_MANUAL_EVENT',N'CLR_AUTO_EVENT', N'DISPATCHER_QUEUE_SEMAPHORE',N'TRACEWRITE', N'XE_DISPATCHER_WAIT',N'BROKER_TO_FLUSH', N'BROKER_EVENTHANDLER',N'FT_IFTSHC_MUTEX', N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP',N'DIRTY_PAGE_POLL', N'SP_SERVER_DIAGNOSTICS_SLEEP')) 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

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轉載于:https://www.cnblogs.com/TeyGao/p/3524398.html

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