Why does ST03n appear to give conflicting stats?

[Former Member]

Ok, so I'm looking at the month of May in ST03n

Workload Overview for the month says:

• average % DB time is 61.6%,
• average % Roll wait time is 14.1%

If I look at Time Profile and work out the averages manually for the same month

• average % DB time is 57.92%
• average % Roll wait time is 16.91%

More of a rhetorical question really but why does different areas of ST03n report the same thing differently?

Which is accurate? Which is correct?

[alwina_enns]

Hello Paul,

what was your procedure to calculate average response time manually? The average response time is the total response time divided by the number of dialog steps.

regards, Alwina

[Former Member]

Hi Alwina,

I take each value for each time frame (00-06, 06-07, etc), add them together and divide by the number of values (17).

Paul.

[alwina_enns]

Hello Paul,

but this would be  "average value of the average response times".

The absolute response time is not available in the workload overview in st03 but in the transacton profile. And you can calculate it from the displayed average response time by mulitplying it with the number of dialog steps.

regards,
Alwina

[Former Member]

When you put it like that, that makes sense!

Ok so for instance (just to make sure I'm understanding correctly!) if I take the top 100 transactions in terms of number of dialog steps and calculate the average response times for those transactions - is that a more accurate representation of actual response time vs the average response time given under Workload Overview?

Because for yesterday they're very different (Work.Over.  0.427 secs vs Trans,Pro.  0.974 secs)

I appreciate your time on this.  thank you.

[alwina_enns]

Hello Paul,

yes, exactly.