about extend memory used in ST02

[Former Member]

Dear expert

Is there a way to know how extend memory is used in ST02

When system start,no user log on we can see:

SAP Memory Curr.Use % CurUse[KB] MaxUse[KB]

Extended memory 1.95 122，880 208,800

But we can find ,after user log on,the extend memory wiill increased.

SAP Memory Curr.Use % CurUse[KB] MaxUse[KB]

Extended memory 54.92 3,452,928 3,768,320

I checked sm04 and stad,no such large amout of memory used.

We can see the problem in Y55.

Is there any way to know how the extend memory is used?

Thank you very much for your help.

Best Regards,

Ellen Wang

Active Global Support - Technology

SAP Asia Pacific(GMT+8)

[Former Member]

extend memory is only used by dialog work process but only when roll memory and extend memory is exceeded. Check ST02 sap memory to check the extend memory.You can also check tcode DB02

Regards,

Sukripa

[marcin_cholewczuk]

Hi Sukripa,

didn't you mean that WP stack is being used after extended and roll memory is out (what leads to switching to private mode)?

Best regards

Marcin Cholewczuk

[Former Member]

The value specifies the size of the roll area in bytes.The roll area is one of several memory areas from which the memory

requirements of user programs are satisfied.For technical reasons, approximately the first 250 KB of a user context is always

stored in the roll area, additional data

1) to the limit ztta/roll_first in the roll area, then

2) in extended memory, to the limit ztta/roll_extension or, if extended memory is exhausted, then

3) in the roll area again, until the roll area is full, then

4) in the heap memory (PRIV mode), to the limit abap/heap_area_dia or abap/heap_area_total or until the address space or

the swap space is exhausted.

Tthe case of non-dialog work processes, the sequence 1) 3) 4) 2) applies. After this, terminations occur, with errors such as:

STORAGE_PARAMETERS_WRONG_SET or an error code that indicates a memory bottleneck.

Cheers !

Manish

[Former Member]

Hello Ellen,

You can wear Tx:ST02 --> Detail Analysis Menu --> Sap Memory --> Extend Memory Block

Here you can see the memory used by users.

I hope it help you.

Regards,

[Former Member]

Hi,

please identify SM21 logs & SM37 jobs status relate to this.

also check parameter em/initial_size_MB. Extended memory depends on Virtual memory allocation.

report RSMEMORY to find out how sap alloctes memory to Dia and Non Dia work processes.

Regards

Nagaraju