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sap-basis

ROLL IN / OUT in SAP Memory Management

I have a question concerning the ROLL IN/ROLL OUT operations. According to (chapter "Functions of the SAP Memory Management System" in the SAP Help documentation "SAP Memory Management (BC-CST-MM)"):

"Whenever a dialog step is executed, a roll action occurs between the roll buffer in the shared memory and the memory area, which is allocated according to ztta/roll_first in a dialog process. Then the area in the shared memory is accessed that belongs to this user context.

The following graphic displays the roll process performed by the dispatcher.

  • Roll-in: cross-user data is rolled in from the common resource in the work process (and is processed there).
  • Roll-out: User-specific data is rolled out from the work process in the common resource (after the dialog step has ended).

The common resource stands for the different SAP memory types."

According to this passage in SAP Help documentation is the Roll IN = From Shared To Local and The Roll Out = From Local To Shared. Am I getting it right?

Because this figure made me a little bit confused :

enter image description here

is the figure false?

Solution

  • Yes. In the figure, the terms "Roll in" and "Roll out" need to be exchanged.