Мониторинг памяти в SQL Server

- Текущее состояние памяти можно увидеть коммандой DBCC MEMORYSTATUS расшифровка результатов тут

- Два запроса позволяющих определить данные из каких таблиц находятся в кеше

1).

;WITH memusage_CTE AS (SELECT bd.database_id, bd.file_id, bd.page_id, bd.page_type
, COALESCE(p1.object_id, p2.object_id) AS object_id
, COALESCE(p1.index_id, p2.index_id) AS index_id
, bd.row_count, bd.free_space_in_bytes, CONVERT(TINYINT,bd.is_modified) AS 'DirtyPage'
FROM sys.dm_os_buffer_descriptors AS bd
JOIN sys.allocation_units AS au
ON au.allocation_unit_id = bd.allocation_unit_id
OUTER APPLY (
SELECT TOP(1) p.object_id, p.index_id
FROM sys.partitions AS p
WHERE p.hobt_id = au.container_id AND au.type IN (1, 3)
) AS p1
OUTER APPLY (
SELECT TOP(1) p.object_id, p.index_id
FROM sys.partitions AS p
WHERE p.partition_id = au.container_id AND au.type = 2
) AS p2
WHERE bd.database_id = DB_ID() AND
bd.page_type IN ('DATA_PAGE', 'INDEX_PAGE','TEXT_MIX_PAGE') )
SELECT TOP 20 DB_NAME(database_id) AS 'Database',OBJECT_NAME(object_id,database_id) AS 'Table Name', index_id,COUNT(*) AS 'Pages in Cache', SUM(dirtyPage) AS 'Dirty Pages'
FROM memusage_CTE
GROUP BY database_id, object_id, index_id
ORDER BY COUNT(*) DESC

2).

SELECT top 20 obj.[name]as "Table Name" ,obj.index_id ,si.name,convert(numeric(10,2),(count(*)*8)/1024.0) AS "cached size (mb)"
FROM sys.dm_os_buffer_descriptors AS bd
INNER JOIN
(
SELECT object_name(object_id) AS name
,index_id ,allocation_unit_id
FROM sys.allocation_units AS au
INNER JOIN sys.partitions AS p
ON au.container_id = p.hobt_id
AND (au.type = 1 OR au.type = 3)
UNION ALL
SELECT object_name(object_id) AS name
,index_id, allocation_unit_id
FROM sys.allocation_units AS au
INNER JOIN sys.partitions AS p
ON au.container_id = p.hobt_id
AND au.type = 2
) AS obj
ON bd.allocation_unit_id = obj.allocation_unit_id
join sys.indexes si on si.index_id = obj.index_id and si.[object_id] = object_id(obj.name)
WHERE bd.database_id = db_id()
GROUP BY obj.name, obj.index_id,si.name
ORDER BY "cached size (mb)" DESC