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-- Isolate top waits WITH Waits AS ( SELECT wait_type, wait_time_ms / 1000. AS wait_time_s, 100. * wait_time_ms / SUM(wait_time_ms) OVER() AS pct, ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS rn, 100. * signal_wait_time_ms / wait_time_ms as signal_pct FROM sys.dm_os_wait_stats WHERE wait_time_ms > 0 AND wait_type NOT LIKE N‘%SLEEP%‘ AND wait_type NOT LIKE N‘%IDLE%‘ AND wait_type NOT LIKE N‘%QUEUE%‘ AND wait_type NOT IN( N‘CLR_AUTO_EVENT‘ , N‘REQUEST_FOR_DEADLOCK_SEARCH‘ , N‘SQLTRACE_BUFFER_FLUSH‘ /* filter out additional irrelevant waits */ ) ) SELECT W1.wait_type, CAST(W1.wait_time_s AS NUMERIC(12, 2)) AS wait_time_s, CAST(W1.pct AS NUMERIC(5, 2)) AS pct, CAST(SUM(W2.pct) AS NUMERIC(5, 2)) AS running_pct, CAST(W1.signal_pct AS NUMERIC(5, 2)) AS signal_pct FROM Waits AS W1 JOIN Waits AS W2 ON W2.rn <= W1.rn GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct, W1.signal_pct HAVING SUM(W2.pct) - W1.pct < 80 -- percentage threshold OR W1.rn <= 5 ORDER BY W1.rn; GO
1.从系统最后一次重启或计数器清空,该等待类型的总等待时间(以秒为单位)
2.该类型的等待时间占等待时间的百分比
3.从最重量级的等待类型到当前等待类型的连续百分比。
4.信号等待时间占等待时间的百分比,、(记住,wait_time_ms包含signal_wait_time_ms)
时间: 2024-11-05 19:00:30