CALCULATE_DIFFERENCE Logic command purpose and usage

Experts,
Recently we are facing the issue of send governor hanging issue and it's causing one of the appserver goes down automatically when users send data using input schedules ,to fix this kind of issues one of the experts suggeted us we should use CALCULATE_DIFFERENCE logic command in the default logic, this is not a permanent fix though but if we use this command the send governor will be active until it reaches the certain no.of sends, for example 20 to 30 , after that we need to manually restart the send governer service.
But as far as I know the purpose of this CALCULATE_DIFFERENCE is at what time delta value should calculated i.e either execution of the logic or posting of the values.
In general when do we use this CALCULATE_DIFFERENCE command? is this command mandatory to include in the logic?
what are the impacts of this command if we include in the logic as currently we are not using command in any of the logic?
How does CALCULATE_DIFFERENCE command affect the send governor service ?
Is there any relation ship between CALCULATE_DIFFERENCE command and send governor service ?
Any help will be apprecited greatly! Thanks

Hi Krishna,
The CALCULATE_DIFFERENCE option allows you to turn off or on the write back by difference.
Here is some further info:
When posting values, BPC needs to write in the database just the difference between what is already stored and the new value. The calculation of the difference takes time. If such calculation is performed directly by the Logic Module at the time of executing the logic, it is possible that the subsequent posting time will be reduced. This is what the logic module does by default. To override the default, the following instruction can be entered in a logic file:
*CALCULATE_DIFFERENCE = 0 (default is 1)
When the calculation of the difference is turned off, the write engine is instructed of the change in behavior and takes over the job of calculating (and posting) the difference, so that the final values will be correct. The main reason for using this instruction is that the debug file will show the values exactly as the user expects them to look like in the fact tables.
Thanks,
John

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