How To Fix 00859 - Maximum number of extended memory management slots

00859 - Overview

• Message type: E = Error

• Message class: 00 -

• Message number: 859

• Message text: Maximum number of extended memory management slots

What causes this issue?

Each internal session needs one such extended memory slot. (Each
external session can contain up to 9 internal sessions).

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

00859 - Details

• The SAP error message "00859 Maximum number of extended memory management slots" typically indicates that the system has reached the limit of extended memory management slots that can be allocated for processes. This can occur in environments where there are many users or processes running simultaneously, leading to a depletion of available memory slots.
  
  Cause:
  
  Memory Configuration: The SAP system has a limit on the number of extended memory management slots, which is determined by the configuration settings in the instance profile.
  High Load: A high number of concurrent users or background jobs can lead to the exhaustion of available memory slots.
  Inefficient Memory Usage: Some processes may not be releasing memory properly, leading to a situation where the slots are not being reused effectively.
  
  
  Solution:
  
  
  Increase Extended Memory Slots:
  
  You can increase the number of extended memory management slots by adjusting the instance profile parameters. Look for the parameter em/initial_size_MB and em/size_MB in the instance profile.
  Example: