WiiSen

--Identify which queries are the most costly by CPU
SELECT TOP 10 
        [Average CPU used] = total_worker_time / qs.execution_count
        ,[Total CPU used] = total_worker_time
        ,[Execution count] = qs.execution_count
        ,[Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
         (CASE WHEN qs.statement_end_offset = -1 
            THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
          ELSE qs.statement_end_offset END - qs.statement_start_offset)/2)
        ,[Parent Query] = qt.text
        ,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
--WHERE DB_NAME(qt.dbid) = 'pnl'  -- Filter on a given database.
ORDER BY [Average CPU used] DESC;


-- Total Reads by most expensive IO query
SELECT TOP 10 
        [Total Reads] = total_logical_reads
        ,[Total Writes] = total_logical_writes
        ,[Execution count] = qs.execution_count
        ,[Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
         (CASE WHEN qs.statement_end_offset = -1 
            THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
          ELSE qs.statement_end_offset END - qs.statement_start_offset)/2) 
        ,[Parent Query] = qt.text
        ,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
ORDER BY [Total Reads] DESC;

-- Total Writes by most expensive IO query
SELECT TOP 10 
        [Total Writes] = total_logical_writes
        ,[Total Reads] = total_logical_reads
        ,[Execution count] = qs.execution_count
        ,[Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
         (CASE WHEN qs.statement_end_offset = -1 
            THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
          ELSE qs.statement_end_offset END - qs.statement_start_offset)/2)
        ,[Parent Query] = qt.text
        ,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
ORDER BY [Total Writes] DESC;