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misunderstanding in MM

Hello!

Can anybody clear the differents between the following parameters for me?

EM/TOTAL_SIZE_MB

em/global_area_MB

em/initial_size_MB

ztta/roll_area

ztta/roll_first.

As I know em/initial_size_MB should be set for all available hardware memory, but in the same time it should be smaller than em/global_area_MB. E.g. em/global_area_MB should use all available memory too?

Can be EM/TOTAL_SIZE_MB set for RAM and SWAP memory?

ztta/roll_area as I see in SAP Help should be the half of em/initial_size_MB? Am I right?

ztta/roll_first = 1.

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