what tables and indexes are using the most memory in the buffer cache

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what tables and indexes are using the most memory in the buffer cache

akhamoshioke

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May 1, 2014 at 6:11 pm

#288375

Comments posted to this topic are about the item what tables and indexes are using the most memory in the buffer cache

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SQLQuest29 SSCrazy Eights Points: 8264 More actions · Answer 1

Contrary to the title, the query does not show the indexes.

Below is an enhanced version (courtesy of Aaron Bertrand)

;WITH src AS

(

SELECT

[Object] = o.name,

[Type] = o.type_desc,

[Index] = COALESCE(i.name, ''),

[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;

______________________________________________________________________________________________________________________________________________________________________________________
HTH !
Kin
MCTS : 2005, 2008
Active SQL Server Community Contributor

phkaushik Grasshopper Points: 11 More actions · Answer 2

after result what to do?

is this help in any performance of databases

akljfhnlaflkj SSC Guru Points: 76202 More actions · Answer 3

SQLQuest29 (5/27/2014)
Contrary to the title, the query does not show the indexes.
Below is an enhanced version (courtesy of Aaron Bertrand)

Thanks for the enhancement.

PHYData DBA SSCertifiable Points: 7541 More actions · Answer 4

Iwas Bornready (10/28/2015)
SQLQuest29 (5/27/2014)
Contrary to the title, the query does not show the indexes.
Below is an enhanced version (courtesy of Aaron Bertrand)
Thanks for the enhancement.

Thank you Aaron for a script that gives us the index name, uses a CTE, and determines buffer space using values in a column instead of the number of rows in the result.

jpratt-797544 SSC Eights! Points: 903 More actions · Answer 5

Great scripts! To show memory buffer MB with a decimal value, I changed "128" to "128.00". Since many of my indexes use less than 1 MB, they all showed as 0 without the decimal included in the division formula.

J Pratt

what tables and indexes are using the most memory in the buffer cache

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