Pages in Cache - Dirty Pages details

I got this query from one of the famous article. This query will provide you the information about the pages cached in the memory. Hope, it will useful for the DBA's to identify the performance issues.



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;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





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Cheers,

Venkatesan Prabu .J