Help: SQL Server

Sharing my knowlege about SQL Server Troubleshooting Skills

Script : Find Currently executing Queries, Blocking, Waits, Statement, Procedure, CPU

Posted by blakhani on July 17, 2014


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

image

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

  • Cheers,
  • Balmukund Lakhani
  • Twitter @blakhani
  • Author: SQL Server 2012 AlwaysOnPaperback, Kindle
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    13 Responses to “Script : Find Currently executing Queries, Blocking, Waits, Statement, Procedure, CPU”

    1. Thanks. It will be helpful to troubleshoot performance issues.

    2. […] this excellent script posted by BalaMukund sir, which would give you an insight  on whats running in your sql server when you […]

    3. […] job and post back. I also asked him to check details from my good friend Balmukund’s blog – query to find what is running at the same time when job runs. He didn’t come back to me – that means […]

    4. subhash Yadav said

      Thanks Bharath

    5. […] profiler trace, and the query to capture currently running queries (refer this blog) I found that it was running sp_help_job stored procedure from MSDB database. This is the procedure […]

    6. Great Script Balmukund 🙂 .This one is really helpful to instantaneously identify the Sprocs which causes high CPU time and Elapsed time. Very good for real time troubleshooting.

    7. Seetha rami reddy said

      Thanks Bharath

    8. […] job and post back. I also asked him to check details from my good friend Balmukund’s blog – query to find what is running at the same time when job runs. He didn’t come back to me – that means […]

    9. Hi Blakhani
      I want to know which count we are getting in above query in r.logical_reads column its related to statement_text column or command_text column because if we are running procedure it will show procedure logical count or running statement part in batch.

      Thanks

    10. Hi Blakhani
      ,r.logical_reads is related to statement_text or command_text ?

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