Memory consumption SQL Server

Script for identifying which database and objects are consuming memory on a SQL Server:

–find out how big buffer pool is and determine percentage used by each database

DECLARE @total_buffer INT;
SELECT @total_buffer = cntr_value FROM sys.dm_os_performance_counters
WHERE RTRIM([object_name]) LIKE ‘%Buffer Manager’ AND counter_name = ‘Total Pages’;
;WITH src AS( SELECT database_id, db_buffer_pages = COUNT_BIG(*)
FROM sys.dm_os_buffer_descriptors –WHERE database_id BETWEEN 5 AND 32766
GROUP BY database_id)SELECT [db_name] = CASE [database_id] WHEN 32767 THEN ‘Resource DB’ ELSE DB_NAME([database_id]) END, db_buffer_pages, db_buffer_MB = db_buffer_pages / 128, db_buffer_percent = CONVERT(DECIMAL(6,3), db_buffer_pages * 100.0 / @total_buffer)
FROM src
ORDER BY db_buffer_MB DESC;

–then drill down into memory used by objects in database of your choice


WITH src AS( SELECT [Object] =, [Type] = o.type_desc, [Index] = COALESCE(, ”), [Index_Type] = i.type_desc, p.[object_id], p.index_id, au.allocation_unit_id
FROM sys.partitions AS p INNER JOIN sys.allocation_units AS au ON p.hobt_id = au.container_id INNER JOIN sys.objects AS o ON p.[object_id] = o.[object_id] INNER JOIN sys.indexes AS i ON o.[object_id] = i.[object_id] AND p.index_id = i.index_id WHERE au.[type] IN (1,2,3) AND o.is_ms_shipped = 0)
SELECT src.[Object], src.[Type], src.[Index], src.Index_Type, buffer_pages = COUNT_BIG(b.page_id), buffer_mb = COUNT_BIG(b.page_id) / 128
FROM src
INNER JOIN sys.dm_os_buffer_descriptors AS b
ON src.allocation_unit_id = b.allocation_unit_id
WHERE b.database_id = DB_ID()
GROUP BY src.[Object], src.[Type], src.[Index], src.Index_Type
ORDER BY buffer_pages DESC;