Response times -- Dialog Steps Week / Weekend: How to compare it?

[Former Member]

Hello,

We have SAP ECC 6.0 running on a HP-UX Cluster. Our service is a 7x7 24x24.

Like most of companies system activity is lower in the weekend, for example:

From Monday to Friday an average of 2.500.000 DIALOG Steps with a response time of 900 ms.

On Saturday we have an average of: 650.000 DIALOGS Steps with a response time of 650 ms.

On Sunday we have an average of: 250.000 DIALOG Steps with a response time of 450 ms.

So the question is: It have sense that with 10% of user activity on sunday response time is near to 50% (comparing 450ms on sunday with 900 ms in the week) why the response time on sunday is not 10% of response time in the week, something like 90 ms?

What is the correct way to analyze this numbers? Probably you never will have a linear function to represent this situation (in fact this is a Exponential function). SAP always have this behavior?

sap_responseTime(t) = exp(t) Where t is the time in ms.

F(450) = 250.000

F(650) = 650.000

F(900) = 2.500.000

Please some tips about this topic.

Best Regards,

Erick Ilarraza

[former_member197561 · Accepted solution]

Dear Erick,

The response time of 450 ms , as it looks, is the minimum which you can achieve on your system - this is due to the way the software is implemented and you cannot go below it.

The 650 ms and respectively 900 ms are due to overhead - different wait times due to  for example insufficient number of Work Processors, database locking wait times, network capacity related waits, and many more.

To achieve 450 ms with higher number of concurrently running transactions, you need to examine the reasons for the wait times concretely on your system and try to mitigate it by tuning or additional hardware.

Best Regards,

Sylvia

[Former Member]

Hi Erick

Response times entirely depend on the overall system hardware, usage and user activities over the system. In your case, during weekends , a lower number of dialog steps suggest fewer dialog logons in comparison to the weekdays.

In contrast, the response time ( 50%) in comparison to weekdays suggest that the users are executing some heavy transactions that show increased overall response time. These may be transactions that run reports with expensive SQL statements or fetch huge volumes of data from your database ( in comparison to the weekdays).

There cannot be a linearity maintained between the dialog steps and response times when users log in and work randomly in a system

I hope this helps

Regards

Chen

[Former Member]

Hello Chen,

"There cannot be a linearity maintained between the dialog steps and response times when users log in and work randomly in a system"

I didn´t take into account this issue, the different ways of working fron the user point of view.

So probably, we can compare "weekends" with "weekends" and "weeks" with "weeks".

Best Regards,

Erick Ilarraza

[Former Member]

Yes Erick

ST03N expert mode lets us compare data in all daily/weekly/monthly manner. You can surely compare weeks with weeks and weekends with weekends.

Regards

Chen