Memory Management under UNIX

Use

The memory management system is automatically activated and configured using your entries during the installation or the upgrade.

Prerequisites

Before you install or upgrade the SAP system, ensure that the host system(s) on which the SAP application server is set up fulfill all the requirements, particularly regarding main memory and swap space.

For more information, see the following section of documentation:

Operating System and Hardware Requirements.

Also refer to the installation checklist and the installation documentation OS Dependencies.

Features

See the section Implementing Memory Management (UNIX).

There are two different implementations for Linux. For more information, see Memory Management under Linux.

Activities

Configuring the Memory Management System

The memory management system is preconfigured in the course of the installation/upgrade procedure. The installation/upgrade program requires information about the host system and sets the memory management parameters for each procedure either to the default values or to the values corresponding to the input. This preconfiguration is valid for the host system on which you perform the installation, and for the server you set up during the installation.

Also see the section Configuration for UNIX.

Checking the Operation of the Memory Management System and Setting Parameters

For more information, see the following section of documentation:

Monitoring the Memory Management System

Profile Parameters of Memory Management

Further Details

The table below summarizes important SAP notes on the topic of memory management, which can be found in SAPNet.

Note Number

Description

Operating System

166551

Diagnosing memory problems

All

33576

Memory management in releases as of 3.0C, UNIX and NT

UNIX, Windows

127871

Inconsistencies in memory consumption display

All

110172

NT: transactions with high memory requirement

Windows

0146528

Configuration on hosts with a large amount of RAM

All