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How to calculate CPU usage per transaction? Expand / Collapse
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Posted Monday, January 20, 2014 2:02 AM
Ten Centuries

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Hi,

As below script output SQL Statement grouped by their cumulative CPU resource consumption. How can calculate CPU usage time per query?




SELECT TOP 5 query_stats.query_hash AS "Query Hash",
SUM(query_stats.total_worker_time) / SUM(query_stats.execution_count) AS "Avg CPU Time",
MIN(query_stats.statement_text) AS "Statement Text"
FROM
(SELECT QS.*,
SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1,
((CASE statement_end_offset
WHEN -1 THEN DATALENGTH(ST.text)
ELSE QS.statement_end_offset END
- QS.statement_start_offset)/2) + 1) AS statement_text
FROM sys.dm_exec_query_stats AS QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) as ST) as query_stats
GROUP BY query_stats.query_hash
ORDER BY 2 DESC;
GO

Thanks
ananda
Post #1532527
Posted Monday, January 20, 2014 5:32 AM


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Using the sys.dm_exec_query_stats DMV, all you can do is what you've done. Take the average and split it up by execution count. If you want a precise measure, you'll need to audit executions using extended events.

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Post #1532584
Posted Monday, January 20, 2014 4:14 PM


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ananda.murugesan (1/20/2014)
Hi,

As below script output SQL Statement grouped by their cumulative CPU resource consumption. How can calculate CPU usage time per query?




SELECT TOP 5 query_stats.query_hash AS "Query Hash",
SUM(query_stats.total_worker_time) / SUM(query_stats.execution_count) AS "Avg CPU Time",
MIN(query_stats.statement_text) AS "Statement Text"
FROM
(SELECT QS.*,
SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1,
((CASE statement_end_offset
WHEN -1 THEN DATALENGTH(ST.text)
ELSE QS.statement_end_offset END
- QS.statement_start_offset)/2) + 1) AS statement_text
FROM sys.dm_exec_query_stats AS QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) as ST) as query_stats
GROUP BY query_stats.query_hash
ORDER BY 2 DESC;
GO

Thanks
ananda


Have you actually looked at the underlying views use in that query to see what's available? I'm sure that if you do, you can probably figure out and average like Grant says.


--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

"Change is inevitable. Change for the better is not." -- 04 August 2013
(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

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