How To Fix /SAPAPO/OM_PERF_MSG311 - Normal objects: Dereference with lock against OMS cache

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_PERF_MSG -

• Message number: 311

• Message text: Normal objects: Dereference with lock against OMS cache

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/OM_PERF_MSG311 - Normal objects: Dereference with lock against OMS cache ?

  The SAP error message /SAPAPO/OM_PERF_MSG311 typically indicates a performance issue related to the Online Monitoring System (OMS) cache in SAP Advanced Planning and Optimization (APO). This error occurs when there is a problem with dereferencing normal objects while trying to access the OMS cache, which can lead to performance degradation or system slowdowns.
  Cause:
  
  Lock Contention: The error often arises due to lock contention when multiple processes are trying to access the same object in the OMS cache simultaneously.
  Cache Configuration: Improper configuration of the OMS cache or insufficient resources allocated to it can lead to performance issues.
  High Load: A high volume of transactions or data requests can overwhelm the system, causing delays and contention for resources.
  Data Consistency Issues: If there are inconsistencies in the data being accessed, it can lead to errors when trying to dereference objects.
  
  Solution:
  
  Analyze Lock Contention: Use transaction codes like SM12 to check for lock entries and identify any processes that are holding locks for an extended period. If necessary, terminate long-running processes that are causing contention.
  Optimize Cache Configuration: Review and optimize the configuration settings for the OMS cache. Ensure that the cache size is adequate for the volume of data being processed.
  Monitor System Performance: Use transaction codes like ST03N or ST04 to monitor system performance and identify any bottlenecks. Look for high CPU or memory usage that could indicate resource constraints.
  Increase Resources: If the system is consistently under heavy load, consider increasing the hardware resources (CPU, memory) allocated to the SAP system.
  Review Custom Code: If there are custom developments or enhancements in the system, review them for performance issues that could be contributing to the error.
  SAP Notes: Check for any relevant SAP Notes or patches that address known issues related to this error message. Applying the latest support packages or patches may resolve underlying issues.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM21 (System Log), ST22 (Dump Analysis), and SM37 (Job Monitoring) to gather more information about the system's state when the error occurs.
  Performance Tuning: Consider engaging in performance tuning activities, such as analyzing SQL queries, optimizing data models, and reviewing background job scheduling.
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. Provide them with detailed logs and system performance metrics to help diagnose the issue.
  
  By addressing the underlying causes and optimizing the system configuration, you can mitigate the occurrence of this error and improve overall system performance.