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Performance tuning through st02

Former Member
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Hi Experts.

My system seems to be in low performance, swaps are increasing and in red color and i think i need a quick guidence about the hit ratio, i have attached the log file for tx. st02, please go through and help me the areas which i need to concentrate and do changes to buffers so that desired hit ratio is achieved and performance issue is resolved.

Thanks

Mohd.

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Answers (3)

Answers (3)

Former Member
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Hi,

The swaps should be less than 2000 per day and please check for the hit ratio for Progam and it should be above 99% . The swaps are shuffling of memory pages based on the data usage in the SGA the memory pages are swapped when you use different data or if any program/batch job that has more selection criteria or more on older data retrieving, it would increase the swapping,

Please check the time when the swaps are increasing , the activites happening behind. Restrict them at one time. If requried you can increase the parameter values but observe for some time and try enhancing the value of parameters.

Hope this would help you.

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Hi Mohd,

The most important thing about dialog response time is the ABAP buffer.

SAP recommands : not more than 1000 swaps per day.

(Edit : sometimes it's "normal" case to get more... But it's a general rule of course.)

So, I can see that you get  more than 330.000 swaps (!!) generated in less than a week.

Did you transport a lot of programs this week ?? SPStack upgrade ? Or what ?

If not, in all cases, you should start enlarging abap/buffersize to 1500 MB at least.

PS : your CUA buffer and Screen buffer are to be enlarged too I think.

Please tell if it helps.

Stéphan

former_member188883
Active Contributor
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Hi Mohd.

As a first step follow the information in SAP help

https://help.sap.com/saphelp_nw70/helpdata/en/c4/3a6ecc505211d189550000e829fbbd/content.htm

Buffer Tuning in ST02 Recommendations | SCN

Hope this helps.

Regards,

Deepak Kori