Swaps

[Former Member]

Hi,

In st02, if there are more swaps in Buffers, which parameters should need to change.

Thanks in advance

[Former Member]

resolved

[Former Member]

Hi Kobby,

Firstly, the Swaps that you are getting in ST02 are basicaly stored as peak values. So it might be that the Swaps that you are seeing, occurred a long time ago. So you will have to monitor if these Swaps are increasing or not. If they aren't then you need not worry, but if they keep on increasing steadily, then you might have to increase the Buffer size using the respective profile parameters. Double clicking on the individual buffers and choosing current parameters will show you the corresponding profile parameters and their current size. You can change the same from RZ10. But here's the catch: you cannot go on increasing Buffer sizes without affecting system performance and paging. For example, increasing the program buffer size will tend to icrease paging in your system if you do not have sufficient memory. So it is advisable to increase buffer sizes in sizeable amounts and roll back if necessary.

Good Luck.

[Former Member]

Hi Kobby,

Before increasing the swap just check is this happening regularly.If you restart your application server then the buffer will be cleaned.There will be no swap.If again will get swaping then you can increase the parameter related swap for which type of buffer you are getting swap.

All the buffer parameter you will get in st02.

Regards

Ashok

[Esha1]

Hi

Swaps are basically displacements happening in buffers.

When you restart the system buffer will get cleared.

By the way in St02 tcode you can view all the buffers and corresponding swaps happening in buffers.

All the SAP buffers reside in shared memory.

But before increasing the buffer size do detect that is the problem is only because of small buffer size settings

and if free memory is available otherwise it will result in memory paging.

Normally if swaps are more than or equal to 10,000 then you need to take some action.

Regarding parameters related to buffer settings:

Parameters Description:

abap/buffersize Program buffer size

rsdb/ntab/entrycount Number of nametab entries administrated

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

rsdb/ntab/sntabsize Data area size for short NTAB buffer

rsdb/ntab/irbdsize Data area size for initial records buffer

rtbb/max_tables directory entries in the single record buffer

rtbb/buffer_length Size of single record table buffers

rsdb/cua/buffersize CUA Buffer Size

zcsa/table_buffer_area Size of generic table buffer

zcsa/db_max_buftab Directory entries in generic table buffer

zcsa/presentation_buffer_area Size of the buffer allocated for screens

sap/bufdir_entries Maximum number of entries in the presentation buffer

nobuf/max_no_buffer_entries Number range buffer size

rsdb/obj/buffersize Size of export/import buffer

rsdb/obj/max_objects Max. no. of exporting/importing objects

rsdb/esm/buffersize_kb Size of exp/imp SHM buffer

rsdb/otr/buffersize_kb Size of OTR buffer

rsdb/esm/max_objects Max. number of objects in the buffer.

rsdb/obj/large_object_size Max. object size of export/import buffer

zcsa/calendar_ids Max. number of directory entries

zcsa/calendar_area Size of calendar buffer

rsdb/obj/large_object_size Max. object size of export/import buffer

Hope this helps.

Kind Regards