ST02-Buffers Issue

[Former Member]

Hi Experts,

I am finding Swaps on daily basis .we are planning to go live very soon with additional 500 users which will make total of 1000.

I want to know whether I may get any issue with performance?will my system may come down with current stttings?

Please advice whether do I really need to tune..

At present I am not getting any performance issues.

My Buffers data is as follows:

Nametab (NTAB) Field description and Program & CUA

Hit Ratios are : 98.25 and 97.80 and 99.59

My Allocated ; 31,289 and 400,000 and 8,00

My Free Space : 3,445 - 11.48% & 1,114 - 0.29% & 19--.27%

My Dir size : 30,000 & 100,000 and 4000

My Free Dir :22,864 -76.21% & 90,077--90.08% & 2,292- 57.30%

Swaps : 80,982 & 382,941 & 4,356

DB Access :88,862 and 1,181,571 and 2,029

MY Memorey Details are :

SAP memory Current use Max. use In memory On disk

[%] [kB] [kB] [kB] [%]

Roll area 5.72 14,986 15,264 65,536 196,608

Paging area 8.83 23,150 45,520 65,536 196,608

Ext Memory 9.35 1,262,592 1,474,560 13500,416

Heap Memory 0 410,065

Thanks

[Former Member]

Hi,

Double click on the buffer, it will give the parameter responisble for the buffer and post the screen shot of ST02, so that we can analyse more on it.

Sudha

[Former Member]

Profile parameter Current Value

Table definition buffer

rsdb/ntab/entrycount 30000

Field description buffer

rsdb/ntab/ftabsize 30000

rsdb/ntab/entrycount 30000

Short nametab (NTAB)

rsdb/ntab/sntabsize 3000

rsdb/ntab/entrycount 30000

Initial record buffer

rsdb/ntab/irbdsize 6000

rsdb/ntab/entrycount 30000

Program buffer

abap/buffersize 400000

abap/pxa shared

CUA buffer

rsdb/cua/buffersize 8000

Screen buffer

zcsa/presentation_buffer_area 20000000

sap/bufdir_entries 10000

Calendar buffer

zcsa/calendar_area 500000

zcsa/calendar_ids 200

OTR buffer

rsdb/otr/buffersize_kb 4096

rsdb/otr/max_objects 2000

rsdb/otr/mutex_n 0

Generic key table buffer

zcsa/table_buffer_area 100000000

zcsa/db_max_buftab 15000

Single record table buffer

rtbb/buffer_length 30000

rtbb/max_tables 500

Export/import buffer

rsdb/obj/buffersize 20000

rsdb/obj/max_objects 20000

rsdb/obj/large_object_size 8192

rsdb/obj/mutex_n 0

Exp/Imp SHM buffer

rsdb/esm/buffersize_kb 4096

rsdb/esm/max_objects 2000

rsdb/esm/large_object_size 8192

rsdb/esm/mutex_n 0

[markus_doehr2]

Without knowing your workload I can just give you values I would put there - they may be too high or low:

Program buffer

abap/buffersize 400000

abap/pxa shared

I´d increase that to 1,000,000 (ERP is a HUGE system with lots of programs)

CUA buffer

rsdb/cua/buffersize 8000

I´d increase to 15,000

Generic key table buffer

zcsa/table_buffer_area 100000000

zcsa/db_max_buftab 15000

I´d increase to 2,000,000 and 30,000

Single record table buffer

rtbb/buffer_length 30000

rtbb/max_tables 500

I´d increase to 50,000 and 1,500

Export/import buffer

rsdb/obj/buffersize 20000

rsdb/obj/max_objects 20000

I´d increase to 50,000 and 30,000

As said, those are just ideas - maybe you should go everywhere for +25%, let the system run a few days and then increase the other 25 % if it´s not enough.

Markus

[Former Member]

Hi Rahul,

Adding no.of users will have no major impact on the ST02 area, it is more do with the application that the users will be accessing in your SAP system.

Memory Management will all depend on the OS and the amount of physical and swapspace/virtual memory available. For Windows there is concept of Zero Memory Management for UNIX, Linux you will have to fine tune the parameters to add sufficient space to it. Check on the alloted memory for your SAP Application and then perform the changes.

The available memory will have to distributed to your OS, Database and SAP Application. The paramters that you mentioned can be fine tuned depending on the memory that you have alloted to SAP Application.

SAP have certain standard method of doing it:

http://help.sap.com/saphelp_nw04/helpdata/en/02/962acd538111d1891b0000e8322f96/frameset.htm

Read certain documents, Do your homework correctly, make a plan and then go for changes. Be aware to take a backup of your SAP profiles and store seperately before you start performing changes.Just in case you need to revert them.

All the Best,

Regards,

Nilesh

[markus_doehr2]

Please put such numbers in code tags (mark them and press on the <> button) so they are better readable.

Is this 32 or 64 bit?

Markus

[Former Member]

Sorry for the inconvinence

Its 64bit

Edited by: rahul khanna on May 21, 2008 8:03 PM

[markus_doehr2]

Since you didn't write which buffer belong to what "hit rates" I can just recommend increasing the buffers (add 25 - 50 %)

Markus