SAP system checks

[Former Member]

During system checks, a Baisis administrator will check Buffer swaps under Export/Import Hit ratio, programs etc. What is the importance of checking these?

[sunny_pahuja2 · Accepted solution]

Hi,

These things are pretty much important to analyze system performance. From this you can analyze paging, memory consumption in your system. For more information check below link:

Check link : http://help.sap.com/saphelp_nw70/helpdata/EN/02/9625e3538111d1891b0000e8322f96/content.htm

http://www.academictutorials.com/sap-basis/sap-basis-tuning-summary-in-transaction.asp

Thanks

Sunny

[Former Member]

1. Export/import buffer:

You can use the ABAP command EXPORT TO SHARED BUFFER to save data clusters in a general work process buffer, the export/import buffer (or shared buffer).

2. ESM buffer:

As of kernel Release 6.10, you have an additional new ABAP command EXPORT TO SHARED MEMORY, that you can use to save data clusters in the export/import shared memory buffer (or ESM buffer for short).

Please check following note for the detailed information.

[https://websmp130.sap-ag.de/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/sapnotes/index2.htm?numm=702728]

[Former Member]

Hi,

Normally in SAP the buffers are used to store the SAP object/data from DB. This is done for easy access of data when the users need them, it helps to increase the performance of the system by decreasing the I/O of system i.e, when the user requests data the work process first checks the buffers for the data requsted by the user, if it finds it there then it returns to the user with the data thereby increasing the speed of the access and in turn the performance. If the data is not found in the buffer a physical access to DB is made thereby increasing the response time and lowering the performance. After the data is fetched and returned to the user a copy of the data is put into the buffer, this helps to increase the access when some other user requests the same data as said above.

This mechanism is accomplished when you have a better buffer size, if your buffer size is very small the data put into the buffer will be pushed out to accomodate the new data, the red color indicates the no.of objects swaped out from the buffer to accomodate the new object in the buffer.

In your case the buffers needs to be increased to accomodate more objects in them, keep in mind that performance tuning needs more analysis and skill.

Changing Buffer parameters involves more calculations and might lead to poor performance if done wrongly or prevent the system to start since you have to restart the system in order to make the profile parameters related to buffers active.

Please check the below links

http://help.sap.com/saphelp_nw04/helpdata/en/c4/3a6e98505211d189550000e829fbbd/frameset.htm

http://help.sap.com/saphelp_nw04/helpdata/EN/02/9625e3538111d1891b0000e8322f96/frameset.htm

http://help.sap.com/saphelp_nw70/helpdata/EN/bc/4a813b680c250fe10000000a114084/content.htm

Regards,

Ravi