Hi,
Roll and Paging Areas are the locations in memory that hold data necessary to perform user requests. When their area in memory reaches its maximum capacity, their data is written out to disk in the Roll File and Page File.
Page Area - holds profiles of access privileges for all active users. These profiles must be checked by the system before it can perform user requests.
Roll Area - is a working area to process user requests. It operates in much the same manner as the Page Area.
SAP extended memory - is the core of the SAP memory management system. Each SAP work process has a part reserved in its virtual address space for extended memory. A buffer bottleneck if swaps begin to occur and max use of extended memory = current use of memory.
Heap memory - Other processes cannot use private (heap) memory. After releasing the assigned memory, the operating system still considers the (virtual) memory as being occupied by the allocating process.
For more detailed info, please check:
http://help.sap.com/saphelp_nw04/helpdata/en/7a/caa6f3bfdb11d188b30000e83539c3/frameset.htm
Thanks,
George
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