How To Fix RT150 - CCMS self-monitoring: number of free active alert slots in shared memory

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 150

• Message text: CCMS self-monitoring: number of free active alert slots in shared memory

What causes this issue?

The <LS>Space </> subtree contains attributes for the remaining space
in the shared memory monitoring segment. Among other things, alerts are
stored in this segment, until they are completed and saved in the alert
database.
This monitoring tree element specifies the percentage of the monitoring
segment that is still available for alerts.
See also SAP Note 414029.

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

INCLUDE SELFMON_INSTANZ OBJECT DOKU ID TX

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RT150 - CCMS self-monitoring: number of free active alert slots in shared memory ?

  The SAP error message RT150, which pertains to CCMS (Computing Center Management System) self-monitoring, indicates that the number of free active alert slots in shared memory has reached a critical level. This can affect the monitoring capabilities of the system, as it may not be able to register new alerts or monitor certain parameters effectively.
  Cause:
  The primary cause of this error is that the number of active alert slots configured in the system has been exhausted. This can happen due to:
  
  High Volume of Alerts: If there are too many alerts being generated, the available slots can fill up quickly.
  Configuration Issues: The system may be configured with a low number of alert slots, which may not be sufficient for the current monitoring needs.
  Memory Leaks: In some cases, memory leaks or other performance issues can lead to the depletion of available slots.
  Long-Running Alerts: Alerts that take a long time to resolve or clear can occupy slots for extended periods.
  
  Solution:
  To resolve the RT150 error, you can take the following steps:
  
  
  Increase Alert Slots:
  
  You can increase the number of alert slots in the CCMS configuration. This is done by adjusting the parameter rdisp/ccms/alert_slots in the instance profile.
  To do this, follow these steps:
  
  Go to transaction RZ10 (Profile Maintenance).
  Select the appropriate instance profile.
  Add or modify the parameter rdisp/ccms/alert_slots to a higher value (e.g., 1000 or more, depending on your needs).
  Save the changes and restart the instance for the changes to take effect.
  
  
  
  
  
  Review and Optimize Alerts:
  
  Review the alerts that are currently being monitored and determine if any can be disabled or consolidated.
  Ensure that alerts are configured to be cleared promptly after the issue is resolved.
  
  
  
  Monitor System Performance:
  
  Regularly monitor the performance of the system to identify any potential issues that could lead to excessive alert generation.
  Use transaction RZ20 to check the status of CCMS monitoring and alerts.
  
  
  
  Check for Memory Leaks:
  
  Investigate if there are any memory leaks or performance issues in the system that could be causing the depletion of alert slots.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may provide additional guidance or patches related to this issue.
  
  
  
  Related Information:
  
  CCMS Monitoring: CCMS is a tool used in SAP systems for monitoring system performance and health. It allows administrators to set up alerts for various system parameters.
  SAP Basis Administration: Understanding the role of SAP Basis administrators is crucial, as they are responsible for system configuration, performance tuning, and monitoring.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as RZ10 (Profile Maintenance), RZ20 (CCMS Monitoring), and SM37 (Job Monitoring) for effective system management.
  
  By following these steps, you should be able to resolve the RT150 error and ensure that your SAP system's monitoring capabilities are functioning optimally.