CPU usage per database

WITH DB_CPU_Statistics AS

(      SELECT pa.DatabaseID, DB_NAME(pa.DatabaseID) AS [Database Name],

                     SUM(qs.total_worker_time/1000) AS [CPU_Time_Ms]

       FROM          sys.dm_exec_query_stats AS qs WITH (NOLOCK)

       CROSS APPLY   (      SELECT CONVERT(INT, value) AS [DatabaseID]

                                  FROM sys.dm_exec_plan_attributes(qs.plan_handle)

                                  WHERE attribute = N'dbid'

                           ) AS pa

       GROUP BY DatabaseID

)

SELECT ROW_NUMBER() OVER(ORDER BY [CPU_Time_Ms] DESC) AS [CPU Ranking],

              [Database Name], [CPU_Time_Ms] AS [CPU Time (ms)],

              CAST([CPU_Time_Ms] * 1.0 / SUM([CPU_Time_Ms]) OVER() * 100.0 AS DECIMAL(5, 2)) AS [CPU Percent]

FROM DB_CPU_Statistics

WHERE DatabaseID <> 32767 -- ResourceDB

ORDER BY [CPU Ranking] OPTION (RECOMPILE);