Limit RAM on the 64 bit (MS2008R2) Server

Hello
I want to first the optimal cache for my applications essbase (2X3DB)
There is a limitation with the total rami I allocated to db?
(On 32-bit he had to up to 2 GB of ram by Db)
Pls advice?

Thank you
M

Before you worry about how big the cache can be you need test also the cache changes very regularly in order to determine the impact of large caches. Changes to the cache require the application be stopped and restarted to take effect. I usually first index to the cache and data from 128 M to 512 M. Data file cache is not used when you use I/O in the buffer (recommended in most cases). Once you have your initial cache settings you must run an important calc (a > 5 minutes) then start the tuning of the caches. Watch your hit ratios in statistics to serve as a gauge on the cache as well as the real test of the duration of the calculation. You must run the test at least two calculations, and I'd rather have ran 5. One will begin the cache and subsequent executions will be more updates cache tracks.

Depending on the version of Essbase, you have to look at MEMSCALINGFACTOR - see: http://docs.oracle.com/cd/E12032_01/doc/epm.921/html_techref/config/memscalingfactor.htm
In older versions of Essbase)< 11.1.2.2)="" you="" required="" this="" setting="" in="" order="" to="" scale="" any="" individual="" cache="" beyond="" 4="">

Then, you will need to consider how much memory you have in your machine - never never want to allocate more memory to caches that exist, and then you should also preserve probably 8 GB in order to act as the operating system disk cache (assuming a cube of I/O in the buffer).

In addition to memory caches uses another Essbase parameters to consume memory as well. The database administrator's guide has enough specific information on various components use memory. Consult the database administrator's guide at: http://docs.oracle.com/cd/E17236_01/epm.1112/esb_dbag.pdf

Kind regards

John A. Booth
http://www.metavero.com

Edited by: John A. Booth on 29 August 2012 07:01 - added reference to SER60

Tags: Business Intelligence

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