HIgh memory Usage - SQL Server Forums

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HIgh memory Usage

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Topic

sachinsonidba
Starting Member

3 Posts

Posted - 2012-11-26 : 08:14:38

hello experts,
please go through the below configuration:-

sql server 2005 sp2
windows server 2003 R2 (64 bit)
CPU 2.13 GHz
RAM 128 GB
max server memory 100GB
min server memory 40GB

Today morning got an issue server was too slow and concernd team taken a screen shot of memory utilization till 102 GB, first concern, is any possibility that sql server can take more memory than what we have defined in max server memory??

Elizabeth B. Darcy
Starting Member

39 Posts

Posted - 2012-11-26 : 09:54:20

Yes it can exceed. Max memory setting is just for the buffer pool. Worker threads (2 megabtyes for each), extended stored procs, linked servers, etc. are outside of that limit.

See which database is consuming the memory using this query:

SELECT
	DB_NAME(database_id) AS DB,
	COUNT(row_count)*8.0/1024.0 AS MB
FROM
	sys.dm_os_buffer_descriptors
GROUP BY
	database_id

If it is tempdb, it is possible that you have long running open transactions, or if RCSI is enabled it may be row versions.

I saw Aaron Bertrand's page only after I wrote the above query, but you may find the information in his blog useful for diagnosing the problem - which includes something similar to my query (but probably better) and other useful information as well: http://www.mssqltips.com/sqlservertip/2393/determine-sql-server-memory-use-by-database-and-object/

________________________________________
-- Yes, I am indeed a fictional character.

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