SAP BUFFER setting for imporve performance

[former_member430534]

DEAR GURU

We are observing that our production sap server have perfromance issue. i found 2 good website to add buffer parameter.

1) http://help.sap.com/saphelp_470/helpdata/en/bc/4a813b680c250fe10000000a114084/content.htm

2) http://scn.sap.com/thread/1249980

AS per abouve website following parameter are helpfull to improve PRODUCTION server performance. but my I would like to know following value how to calculated and these valuse are standard or related to SERVER hardware (RAM, PROCESSOR, HARDDISK SPACE, SWAP SIZE). need your help

rsdb/ntab/entrycount                     40000

rsdb/ntab/ftabsize                         60000

rsdb/ntab/sntabsize                      6000

rsdb/ntab/irbdsize                        12000

abap/buffersize                            450000

rsdb/cua/buffersize                      12000

zcsa/presentation_buffer_area     25000000

sap/bufdir_entries                         8000

zcsa/table_buffer_area               75000000

zcsa/db_max_buftab                  10000

rtbb/buffer_length                       25000

rtbb/max_tables                          2000

rsdb/obj/buffersize                    30000

rsdb/obj/max_objects               15000

ipc/shm_psize_10                    156000000

ipc/shm_psize_40                    174000000.

[former_member184544]

Zero Administration is relevant only to Windows.What is your OS and DB ?

[nicholas_chang]

Hi Danish,

As for below parameter and value, is highly depends on the historical value in ST02. You need to monitor and further fine tune if you noticed high swapping on certain SAP Buffer.

If i still can remember correctly, as SAP Rules of thumb for optimize performance,

abap/buffersize	should not exceed 10,000  and the rest should not exceed 2000.

Usually, if you noticed high swapping on certain buffer, you can add another 20-30% to it as long as there's no memory bottleneck and sufficient physical memory.

rsdb/ntab/entrycount                     40000

rsdb/ntab/ftabsize                         60000

rsdb/ntab/sntabsize                      6000

rsdb/ntab/irbdsize                        12000

abap/buffersize                            450000

rsdb/cua/buffersize                      12000

zcsa/presentation_buffer_area     25000000

sap/bufdir_entries                         8000

zcsa/table_buffer_area               75000000

zcsa/db_max_buftab                  10000

rtbb/buffer_length                       25000

rtbb/max_tables                          2000

rsdb/obj/buffersize                    30000

rsdb/obj/max_objects               15000

you need to adjust below parameter by running sappfpar check pf= after you've changed SAP Buffer value/.

ipc/shm_psize_10                 

ipc/shm_psize_40                   

Cheers,

Nicholas Chang

[Former Member]

Dear Danish,

If this is in my court, Usually I will perform the zero administration management as a first step - 88416. This is the standard one, And with respect to performance - Normally there are 3 things has to be noted

1. SAP performance - Buffer parametes and usage

2. Database performance / SPACE - parameters

3. OS level - Ensuring there are no page issues

Considering all the factors we will increase the SAP parameter with respect to buffered in ST02 and will try to increase the parameter by doubling the values one by one. Because we cannot increase the parameter all of sudden at once and this might slow down the performance ins some cases ( Because, I have been advised by SAP once that the your memory parameter exceeded the 7GB which may cause a performance problem - Got this as response for the performance which I had performance problem in our PRD system).

Bottom line : I would advise that, Increase the parameter value by considering the buffered amount which is indicated in the ST02 trasncation - But strongly advised not at once, because incase if we get in to problem we would need to revert it back.

Regards

Vijay