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find out which query is maxing the temp db

Posted on 2012-04-10
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Last Modified: 2012-04-27
at 5pm, we find that tempdb is going to 45gb max.. we want to find the exact statement that causes it.. how would you go about finding it?
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Question by:25112
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Rich Weissler earned 500 total points
ID: 37829256
Looking at the microsoft MSDN - http://msdn.microsoft.com/en-us/library/ms176029.aspx down at 'Method 2: Query Level Information'  (I've taken out the second view, just so it'll display immediately for you.  Be mindful: this does create an extra view in your current database.)

 CREATE VIEW all_request_usage
AS
  SELECT session_id, request_id,
      SUM(internal_objects_alloc_page_count) AS request_internal_objects_alloc_page_count,
      SUM(internal_objects_dealloc_page_count)AS request_internal_objects_dealloc_page_count
  FROM sys.dm_db_task_space_usage
  GROUP BY session_id, request_id;
GO
  SELECT R1.session_id, R1.request_id,
      R1.request_internal_objects_alloc_page_count, R1.request_internal_objects_dealloc_page_count,
      R2.sql_handle, R2.statement_start_offset, R2.statement_end_offset, R2.plan_handle
  FROM all_request_usage R1
  INNER JOIN sys.dm_exec_requests R2 ON R1.session_id = R2.session_id and R1.request_id = R2.request_id;

The third and fourth columns should give you an idea which query is standing out.  The sql_handle and plan_handles can be plugged into:
SELECT * FROM sys.dm_exec_sql_text(@sql_handle);
SELECT * FROM sys.dm_exec_query_plan(@plan_handle);

to output the text of the query that's filling your tempdb.
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