find out which query is maxing the temp db

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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Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
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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Microsoft SQL Server 2008

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