An overview of the memory management parameters will be shown in the following sections.
A description of the parameter always follows the unit in which it is specified, the default value and a proposed value. The default value usually is based on a minimal value, therefore for very small R/3 installations (see Application Servers with Up to 15 Users), the proposed value is based on a midsize to large installation (see Application Servers with Up to 50 Users and Application Servers with Over 50 Users).
The specified default values and proposed values are based on UNIX systems; under Windows NT, the parameter setting is explained in the unit Parameter Overview for Windows NT.
Controlling Memory Management
abap/heaplimit: Work Process Startup
Memory Management Resources
ztta/roll_extension: Extended Memory Limit
abap/heap_area_dia: Heap Memory Limit for Dialog Work Processes
abap/heap_area_nondia: Heap Memory Limit for Non-Dialog Work Processes
abap/heap_area_total: Heap Memory Limit
Memory Management Limitations
em/initial_size_MB: Extended Memory Pool Size
rdisp/ROLL_SHM: Roll Buffer Size
rdisp/ROLL_MAXFS: Maximum Roll File Size
rdisp/PG_SHM: Paging Buffer Size
rdisp/PG_MAXFS: Maximum Size of the R/3 Paging File
ztta/roll_area: Roll Area
ztta/roll_first: Initial Allocation Size from the Roll Area
em/blocksize_KB: Segment Size for the Extended Memory
Memory Management Statistics
em/stat_log_size_MB: Statistics - User Context Size
em/stat_log_timeout: Statistics - User Context Size
Look at the unit that corresponds to your platform on configuring the memory management system:
Configuration for UNIX / Windows NT
Configuration for AIX
AS/400 Configuration
Memory Management under Windows NT
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