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wait stats precentage?


wait stats precentage?

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SQL Galaxy
SQL Galaxy
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Group: General Forum Members
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Hi,

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
FROM sys.dm_os_wait_stats WITH (NOLOCK)
WHERE wait_type NOT IN (N'CLR_SEMAPHORE',N'LAZYWRITER_SLEEP',N'RESOURCE_QUEUE',
N'SLEEP_TASK',N'SLEEP_SYSTEMTASK',N'SQLTRACE_BUFFER_FLUSH',N'WAITFOR',
N'LOGMGR_QUEUE',N'CHECKPOINT_QUEUE', N'REQUEST_FOR_DEADLOCK_SEARCH',
N'XE_TIMER_EVENT',N'BROKER_TO_FLUSH',N'BROKER_TASK_STOP',N'CLR_MANUAL_EVENT',
N'CLR_AUTO_EVENT',N'DISPATCHER_QUEUE_SEMAPHORE', N'FT_IFTS_SCHEDULER_IDLE_WAIT',
N'XE_DISPATCHER_WAIT', N'XE_DISPATCHER_JOIN', N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP',
N'ONDEMAND_TASK_QUEUE', N'BROKER_EVENTHANDLER', N'SLEEP_BPOOL_FLUSH',
-- DIRTY_PAGE_POLL, HADR_FILESTREAM_IOMGR_IOCOMPLETION, and SP_SERVER_DIAGNOSTICS_SLEEP are SQL 2012 only
N'DIRTY_PAGE_POLL', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', N'SP_SERVER_DIAGNOSTICS_SLEEP'))
SELECT W1.wait_type,
CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s,
CAST(W1.pct AS DECIMAL(12, 2)) AS pct,
CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct
FROM Waits AS W1
INNER JOIN Waits AS W2
ON W2.rn <= W1.rn
GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct
HAVING SUM(W2.pct) - W1.pct < 99 OPTION (RECOMPILE); -- percentage threshold



output values for exapmle wait type is CXPACKET,Here which precentage should be consider? pct or running pct.

wait type - CXPACKET
WAITTIME - 305.65
precentage - 1.85
Running precentage - 91.39
sugnu iu
sugnu iu
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Group: General Forum Members
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anyone? pct or running_pct?
Neenarg
Neenarg
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consider the running_pct as a running total down the list of results..

The top row returned will be the same.. then running pct is that value plus the next largest as you go down..

So

WaitType ----- Time ----- PCT ----- running_PCT
Wait 1 ------------------- 50 --------- 50
Wait 2 ------------------- 40 --------- 90
Wait 3 ------------------- 5 --------- 95

etc

Hope this helps.. :-D
SQLRNNR
SQLRNNR
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In short, look at the PCT column.;-)

Jason...AKA CirqueDeSQLeil
_______________________________________________
I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
Posting Performance Based Questions - Gail Shaw
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