sqlserver 数据库内存占比查询

SELECT 
    ISNULL(DB_NAME(DATABASE_ID),'RESOURCEDB') AS DATABASENAME,
    CAST(COUNT(ROW_COUNT) * 8.0 /(1024.0) AS DECIMAL(28,2)) AS 'SIZE(MB)'
FROM SYS.dm_os_buffer_descriptors
GROUP BY database_id
ORDER BY DATABASENAME