on 12-07-2008 5:32 PM
Hi ,
Please tell me the memory usage flow in SAP .How would it change while more swap "Red" occurs in ST02 and If we increase physical memory suddenly.
Thanks in advance
Daniel
Hello Daniel,
the values in ST02 has nothing todo with the physical memory usage (but of course the memory pools should fit into the physical memory). You can tune this memory areas with profile parameters (you can see also the corresponding parameters via ST02).
It also depends on the kind of memory area which has the swaps. I have faced a massive performance decrease when the Export / Import Shared Buffer has more swaps, because of some JIT data is buffered and the data has to be selected from the database every time. In another system i have seen no problems.
As you can see it always depends on your kind of system and the specific load.
The way how sap allocates memory depends also on your OS:
http://help.sap.com/saphelp_47x200/helpdata/en/34/d9c8b9c23c11d188b40000e83539c3/content.htm
http://help.sap.com/saphelp_47x200/helpdata/en/02/9627af538111d1891b0000e8322f96/content.htm
http://help.sap.com/saphelp_47x200/helpdata/en/d1/80b716dc8111d2ac8f0000e83539c3/content.htm
Regards
Stefan
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