This is one of my all time favorite script which I use most of the time in troubleshooting performance issues on live systems. This helps in findings below:
- What is the performance bottleneck?
- Is there any blocking? If yes, who is the blocker?
- What are the queries which are executing currently?
- What is the name of the stored procedure running currently?
- Which statement in stored procedure is getting executed right now?
- Who is consuming CPU right now? What are the high CPU queries?
- Who is doing lots of IO right now?
Column heading is self-explanatory. You need to adjust ORDER BY clause based on your need. In below query, I am showing top CPU consumers at the top.
SELECT s.session_id ,r.STATUS ,r.blocking_session_id 'blocked by' ,r.wait_type ,wait_resource ,r.wait_time / (1000.0) 'Wait Time (in Sec)' ,r.cpu_time ,r.logical_reads ,r.reads ,r.writes ,r.total_elapsed_time / (1000.0) 'Elapsed Time (in Sec)' ,Substring(st.TEXT, (r.statement_start_offset / 2) + 1, ( ( CASE r.statement_end_offset WHEN - 1 THEN Datalength(st.TEXT) ELSE r.statement_end_offset END - r.statement_start_offset ) / 2 ) + 1) AS statement_text ,Coalesce(Quotename(Db_name(st.dbid)) + N'.' + Quotename(Object_schema_name(st.objectid, st.dbid)) + N'.' +
Quotename(Object_name(st.objectid, st.dbid)), '') AS command_text ,r.command ,s.login_name ,s.host_name ,s.program_name ,s.host_process_id ,s.last_request_end_time ,s.login_time ,r.open_transaction_count FROM sys.dm_exec_sessions AS s INNER JOIN sys.dm_exec_requests AS r ON r.session_id = s.session_id CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS st WHERE r.session_id != @@SPID ORDER BY r.cpu_time DESC ,r.STATUS ,r.blocking_session_id ,s.session_id
Here is the partial output
Note that since it shows currently executing request, it won’t show the request which are not doing anything like sleeping connection or awaiting command.
Hope this helps