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SAP Memory Management -an Overview

Updated May 18, 2018

SAP Memory Management
SAP Memory areas overview :
- SAP Buffer
- SAP Roll Memory
- SAP Extended Memory
- SAP Heap Memory
- SAP Paging Memory
- Fixed Local Memory of the SAP work Process
Main factors in configuring SAP Memory :
- Physical Main Memory (RAM)
 give attention to ratio between physical and virtual memory
- Operating system options and restrictions
 compare between 32 and 64 bit system architecture

 

Memory management fundamental :
The word “memory”  virtual memory
 physical main memory + swap space
 local memory + shared memory

The maximum amount of virtual memory that can be allocated is limited by two variable :
- Result of physical hardware restriction
- Maximum address space permited by operating system

The Operating System manages two type of memory :
-Local memory
 allocated precisely to one operating system process
-Shared memory
 accessible to multiple operating system process

User Context
Reffered :
 Data which is generated by transaction process
 Variables, Internal table & screen list
 New sesion = new user context
 Data is stored independently in different memory areas
 Stored in SAP roll memory, SAP extended memory, & SAP Heap Memory

Sesions divide into :
External sesion -> opened explicitly by user
 Internal sesion -> Opened implicitly by program
submit, call transaction, call dialog, call screen, call function in
update task, call function in background task, and call
function starting new task.


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