Query to find adhoc queries taking high cpu on server

Question

Hi,
I want to find all the adhoc and other queries consuming high cpu on sql server. sys.dm_exec_cahched_plan will only have cached queries and not the currently running ones.

Answer 1

Hi Preetha7,
According to your description, if you want to identify the most expensive SQL Server queries based on the cumulative CPU cost, you can use the DMVs of the sys.dm_exec_sql_text , the sys.dm_exec_query_plan and sys.dm_exec_query_stats. For example, you can
refer to the following T-SQL statement.
SELECT TOP 20
qs.sql_handle,
qs.execution_count,
qs.total_worker_time AS Total_CPU,
total_CPU_inSeconds = --Converted from microseconds
qs.total_worker_time/1000000,
average_CPU_inSeconds = --Converted from microseconds
(qs.total_worker_time/1000000) / qs.execution_count,
qs.total_elapsed_time,
total_elapsed_time_inSeconds = --Converted from microseconds
qs.total_elapsed_time/1000000,
st.text,
qp.query_plan
FROM
sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
CROSS apply sys.dm_exec_query_plan (qs.plan_handle) AS qp
ORDER BY qs.total_worker_time DESC
Or you can run the "Performance - Top Queries By Total CPU Time" report in SSMS. In addition, you can use SQL Server Extended Events session for troubleshooting the high consumed of CPU time. For more information about finding currently session that is costing
high CPU.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/cb3e29ca-f1ef-4440-8f1a-db4924a43c5c/find-currently-session-that-is-costing-high-cpu?forum=sqldatabaseengine
http://blogs.msdn.com/b/batala/archive/2011/07/23/troubleshoot-high-cpu-issue-without-using-profile-traces.aspx
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support