Maximum Use of SAP Extended Memory

As previously described, the SAP Memory Manager copies the memory blocks of the roll area between the process address area and the shared memory with a memory copy command. However, the memory blocks of the Extended Memory are included again when the user context is changed. This is more efficient than copying blocks of the roll area. For this reason, the user context should largely be located in the Extended Memory. The profile parameter ztta/roll_first sets the size of the allocated memory in the roll area, before Extended Memory is used. If you set the profile parameter to 1, the SAP Memory Manager is told to use the Extended Memory immediately.

Maximum Use of Extended Memory: Parameter Values under Windows NT

Profile Parameter	Parameter Value
ztta/roll_first	1 (byte)
ztta/roll_area	2000000 (bytes) Any smaller values may lead to errors.

See: Parameter Overview for Windows NT