Recomendations for SAP Parameters

[Former Member]

Hi All,

I have list of parameters for which SAP has recomended the values to be changed.I want understand what are we changing and why are we changing to a particular value.

We have 3 dialog instances and a central instance.

For the dialog instance sap has recomended the following.

abap/buffersize Program buffer size 1200000 1560000

rsdb/ntab/ftabsize Data area size for field description buffer 140000 182000

rsdb/obj/buffersize Size of export/import buffer 150000 240000

rtbb/buffer_length Size of single record table buffers 84500 110000

zcsa/table_buffer_area Size of generic table buffer 219700000 285610000

ztta/short_area Size of short-term memory 3200000 4000000

ztta/max_memreq_MB Memory for a single call 256 <To be deleted>

icm/keep_alive_timeout Network Connection Keep Alive Timeout 60 90

rdisp/vbreorg Delete uncompleted update requests 1 <To be deleted>

For the central instance

abap/buffersize Program buffer size 800000 1040000

zcsa/table_buffer_area Size of generic table buffer 160000000 208000000

ztta/short_area Size of short-term memory 3200000 4000000

ztta/max_memreq_MB Memory for a single call 256 <To be deleted>

icm/keep_alive_timeout Network Connection Keep Alive Timeout 60 90

rdisp/vbreorg Delete uncompleted update requests 1 <To be deleted>

[Former Member · Accepted solution]

Hello please let me know what info my side i should be giving since it would be impossible to predict what would be best suitable for me unless one knows the hardware.

os red hat release 4

database oracle 10.2.0.4

Memory

total used free shared buffers cached

Mem: 32955484 31341632 1613852 0 256700 21040028

-/+ buffers/cache: 10044904 22910580

Swap: 20971440 977548 19993892

[Former Member · Accepted solution]

You can check the current SAP memory utilization by executing blow OS command

sappfpar check pf=<instance profile>

make sure you have no errors and depends on the above command result you can change the parameters. Change the parameters suggested by SAP and again re-run above command and see the difference.

[Former Member · Accepted solution]

Hi,

================================================================================

== Checking profile: PS0_D62_sapkxpr3ap01

================================================================================

***WARNING: Unexpected parameter: rdisp/incr_spa_on_roll =1

***WARNING: Unexpected parameter: rdisp/max_com_msg =500

***WARNING: Unexpected parameter: system/type =ABAP

Shared memory disposition overview

================================================================

Shared memory pools

Key: 10 Pool

Size configured.....: 194000000 ( 185.0 MB)

Size min. estimated.: 190487520 ( 181.7 MB)

Advised Size........: 194000000 ( 185.0 MB)

Key: 40 Pool for database buffers

Size configured.....: 356000000 ( 339.5 MB)

Size min. estimated.: 352087040 ( 335.8 MB)

Advised Size........: 356000000 ( 339.5 MB)

Shared memories inside of pool 10

Key: 11 Size: 845000 ( 0.8 MB) Factory calender buffer

Key: 12 Size: 6000000 ( 5.7 MB) TemSe Char-Code convert Buf.

Key: 13 Size: 60500000 ( 57.7 MB) Alert Area

Key: 14 Size: 51917000 ( 49.5 MB) Presentation buffer

Key: 16 Size: 22400 ( 0.0 MB) Semaphore activity monitoring

Key: 17 Size: 21202352 ( 20.2 MB) Roll administration

Shared memories inside of pool 40

Key: 42 Size: 56512992 ( 53.9 MB) DB TTAB buffer

Key: 43 Size: 157494392 ( 150.2 MB) DB FTAB buffer

Key: 44 Size: 30518392 ( 29.1 MB) DB IREC buffer

Key: 45 Size: 17206392 ( 16.4 MB) DB short nametab buffer

Key: 46 Size: 20480 ( 0.0 MB) DB sync table

Key: 47 Size: 36865024 ( 35.2 MB) DB CUA buffer

Key: 48 Size: 500000 ( 0.5 MB) Number range buffer

Key: 49 Size: 2968344 ( 2.8 MB) Spool admin (SpoolWP+DiaWP)

Shared memories outside of pools

Key: 1 Size: 2500 ( 0.0 MB) System administration

Key: 2 Size: 61790068 ( 58.9 MB) Disp. administration tables

Key: 3 Size: 114048000 ( 108.8 MB) Disp. communication areas

Key: 4 Size: 560248 ( 0.5 MB) statistic area

Key: 6 Size: 1277952000 (1218.7 MB) ABAP program buffer

Key: 7 Size: 14838 ( 0.0 MB) Update task administration

Key: 8 Size: 268435556 ( 256.0 MB) Paging buffer

Key: 9 Size: 268435556 ( 256.0 MB) Roll buffer

Key: 18 Size: 7000100 ( 6.7 MB) Paging adminitration

Key: 19 Size: 219700000 ( 209.5 MB) Table-buffer

Key: 30 Size: 100352 ( 0.1 MB) Taskhandler runtime admin.

Key: 31 Size: 3006000 ( 2.9 MB) Dispatcher request queue

Key: 33 Size: 86528000 ( 82.5 MB) Table buffer, part.buffering

Key: 41 Size: 25010000 ( 23.9 MB) DB statistics buffer

Key: 51 Size: 3200000 ( 3.1 MB) Extended memory admin.

Key: 52 Size: 40000 ( 0.0 MB) Message Server buffer

Key: 54 Size: 153608192 ( 146.5 MB) Export/Import buffer

Key: 55 Size: 8192 ( 0.0 MB) Spool local printer+joblist

Key: 57 Size: 1048576 ( 1.0 MB) Profilparameter in shared mem

Key: 58 Size: 4096 ( 0.0 MB) Enqueue ID for reset

Key: 62 Size: 736100352 ( 702.0 MB) Memory pipes

Key: 63 Size: 409600 ( 0.4 MB) ICMAN shared memory

Key: 64 Size: 4202496 ( 4.0 MB) Online Text Repository Buf.

Key: 65 Size: 4202496 ( 4.0 MB) Export/Import Shared Memory

Key: 1002 Size: 400000 ( 0.4 MB) Performance monitoring V01.0

Key: 58900162 Size: 4096 ( 0.0 MB) SCSA area

Nr of operating system shared memory segments: 28

Shared memory resource requirements estimated

================================================================

Total Nr of shared segments required.....: 28

System-imposed number of shared memories.: 1000

Shared memory segment size required min..: 1277952000 (1218.7 MB)

System-imposed maximum segment size......: 17582522368 (16768.0 MB)

Swap space requirements estimated

================================================

Shared memory....................: 3612.3 MB

..in pool 10 181.7 MB, 98% used

..in pool 40 335.8 MB, 98% used

..not in pool: 3085.9 MB

Processes........................: 1276.8 MB

Extended Memory .................: 24576.0 MB

-

---

Total, minimum requirement.......: 29465.1 MB

Process local heaps, worst case..: 5722.0 MB

Total, worst case requirement....: 35187.2 MB

Errors detected..................: 0

Warnings detected................: 3

[former_member759680 · Accepted solution]

Your "sappfpar check" is good.

If you ran this check after changing the values to SAP recommended values, then just take a restart of SAP and your changes will be in effect.

If you need further help on the values check this link -

http://help.sap.com/saphelp_470/helpdata/en/bc/4a813b680c250fe10000000a114084/frameset.htm

[Former Member · Accepted solution]

hm! can you please change the parameters suggested by SAP and agan re-run above checks?

Try to modify parameters via RZ10 then you can easily revert all then changes using version management.

[Former Member · Accepted solution]

sSunil.

Thats the whole point i want to know why the changes i am making.

[Former Member · Accepted solution]

Hi,

I hope the value suggestions have come in as a part of EWA report.

These values are suggested depending upon the system resources and the load the on the system.

I do not have the exact calculations on how SAP arrives at these values. But a deep study of the system and the parameter can provide those calculations which are pre configred in the EWA.

Cheers.....,

Raghu

[Former Member · Accepted solution]

SAP has internal tool to calculate standared values depends on your current system configuration.

[former_member227283 · Accepted solution]

Hi Ambarish,

Can you first tell us, by what reason you have came to the conclusion for making changes in the SAP parameter ???

Above parameter which you have written are mostly related to buffer.

Thanks

Anil

[Former Member · Accepted solution]

I didnt come to conclusion.SAP has recomended us to change the parameters.Thanks.

[Former Member · Accepted solution]

I want to understand how the thresholds are decided by SAP regarding the parameters.Thanks.

[Former Member]

First valu indicates our value and the second is recomended value.