Find SQL Server Memory Use by Database and Objects

Sometime for guy who involved in database field want to know SQL Server Memory Use by Database and Objects for the optimization and performance deeds, so this below query can help him

SELECT
[DatabaseName] = CASE [database_id] WHEN 32767
THEN 'Resource DB'
ELSE DB_NAME([database_id]) END,
COUNT_BIG(*) [Pages in Buffer],
COUNT_BIG(*)/128 [Buffer Size in MB]
FROM sys.dm_os_buffer_descriptors
GROUP BY [database_id]
ORDER BY [Pages in Buffer] DESC;

Hope it will help for them.
Thanks