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Geeta,
The reason CpuTime was removed was because it was duplicating the information provided by the sum of the other fields. We were reducing the cost of the SPS table by removing unnecessary columns.
The sum is available in the view as CpuTime.
I believe you assumptions in your first question are correct.
In your second question is it possible you are comparing CPU from SPMA and CPU from SPS? All the CPU columns in the SPMA table are reported in centiseconds. All the CPU columns in the SPS table are reported in milliseconds.
If you are comparing the CPU across the two different tables you will need to divide the CPU usage in the ResUsageSPS table by 10 to make it comparable to the CPU in ResUsageSPMA table.
Thanks, -Carrie