Trouver la consommation de CPU par base de données en utilisant le cache de plans, sous SQL Server 2005 et suivants

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-- Nicolas Souquet - 2012-02-12
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;WITH
  DB_CPU_STAT AS
  (
    SELECT    D.database_id
        , D.name AS database_name
        , SUM(total_worker_time) / 1000 AS total_CPU_time_ms
    FROM    sys.dm_exec_query_stats AS QS
    CROSS APPLY  (
          SELECT  CONVERT(int, value) AS database_id  
          FROM  sys.dm_exec_plan_attributes(QS.plan_handle)
          WHERE  attribute = N'dbid'
        ) AS DB
    INNER JOIN  sys.databases AS D
          ON DB.database_id = D.database_id
    GROUP BY  D.database_id, D.name
  )
SELECT  database_name
  , total_CPU_time_ms / 1000 AS total_CPU_time_s
  , CAST(total_CPU_time_ms * 1.0 / SUM(total_CPU_time_ms) OVER() * 100.0 AS decimal(5, 2)) AS [CPU_%]
FROM  DB_CPU_STAT
WHERE  database_id > 4 -- system databases
AND  database_id <> 32767 -- ResourceDB
ORDER  BY total_CPU_time_ms DESC