Find Inefficient T-SQL Stored Procedures

Friday, May 29 2009 - Database by Nick Kewney

The following is a stored procedure you can use when you want to quickly identify procedures in your SQL Server database which are taking up excessive CPU time.

The script returns 3 recordsets:

  • The number of active connections by database name, with login name and hostname
  • All stored procedures with execution count and total/average CPU times
  • All stored procedures with average and total elapsed time
CREATE PROCEDURE [dbo].[procProcessTimes]

AS

SELECT DB_NAME(dbid) as DBName, COUNT(dbid) as NumberOfConnections, loginame as LoginName , Hostname
FROM    sys.sysprocesses 
WHERE     dbid > 0 
GROUP BY     dbid, loginame, Hostname

SELECT DB_NAME(st.dbid) DBName
      ,OBJECT_SCHEMA_NAME(st.objectid,dbid) SchemaName
      ,OBJECT_NAME(st.objectid,dbid) StoredProcedure
      ,max(cp.usecounts) Execution_count
      ,sum(qs.total_worker_time) total_cpu_time
      ,sum(qs.total_worker_time) / (max(cp.usecounts) * 1.0)  avg_cpu_time 
 FROM sys.dm_exec_cached_plans cp join sys.dm_exec_query_stats qs on cp.plan_handle = qs.plan_handle
      CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st
 where DB_NAME(st.dbid) is not null and cp.objtype = 'proc'
 group by DB_NAME(st.dbid),OBJECT_SCHEMA_NAME(objectid,st.dbid), OBJECT_NAME(objectid,st.dbid) 
 order by sum(qs.total_worker_time) desc

SELECT DB_NAME(st.dbid) DBName
      ,OBJECT_SCHEMA_NAME(objectid,st.dbid) SchemaName
      ,OBJECT_NAME(objectid,st.dbid) StoredProcedure
      ,max(cp.usecounts) execution_count
      ,sum(qs.total_elapsed_time) total_elapsed_time
      ,sum(qs.total_elapsed_time) / max(cp.usecounts) avg_elapsed_time
 FROM sys.dm_exec_query_stats qs CROSS APPLY sys.dm_exec_sql_text(qs.plan_handle) st
   join sys.dm_exec_cached_plans cp on qs.plan_handle = cp.plan_handle
  where DB_NAME(st.dbid) is not null and cp.objtype = 'proc'
 group by DB_NAME(st.dbid),OBJECT_SCHEMA_NAME(objectid,st.dbid), OBJECT_NAME(objectid,st.dbid) 
 order by sum(qs.total_elapsed_time) desc
 

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