How To Fix UJD_EXCEPTION284 - Buffer head critical section: Get &1 times, conflict &2 times

SAP Error Message - Details

• Message type: E = Error

• Message class: UJD_EXCEPTION - BPC: Data Manager Exception Message Class

• Message number: 284

• Message text: Buffer head critical section: Get &1 times, conflict &2 times

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UJD_EXCEPTION284 - Buffer head critical section: Get &1 times, conflict &2 times ?

  The SAP error message UJD_EXCEPTION284 indicates a problem related to the buffer head critical section in the SAP system. This error typically arises in the context of SAP BW (Business Warehouse) or SAP HANA environments, where there are issues with data processing or data loading.
  Cause:
  The error message suggests that there is a conflict in accessing a shared resource (the buffer head) in the system. This can occur due to:
  
  Concurrency Issues: Multiple processes or threads are trying to access the same resource simultaneously, leading to conflicts.
  Locking Mechanisms: The system may have locking mechanisms that prevent multiple accesses to the same data, and if these locks are not managed properly, it can lead to this error.
  Performance Bottlenecks: High load on the system or inefficient queries can lead to contention for resources, causing the buffer head to be accessed multiple times without resolution.
  Configuration Issues: Incorrect configuration settings in the BW or HANA system can also lead to this error.
  
  Solution:
  To resolve the UJD_EXCEPTION284 error, consider the following steps:
  
  
  Check for Concurrent Processes: Identify if there are multiple processes trying to access the same resource. If so, try to schedule them to run at different times to avoid conflicts.
  
  
  Review Locking Mechanisms: Investigate the locking mechanisms in place. Ensure that locks are being released properly after their use. You may need to analyze the code or processes that are causing the locks.
  
  
  Optimize Queries: If the error is related to performance, review and optimize the queries being executed. Look for ways to reduce the load on the system, such as indexing or rewriting inefficient queries.
  
  
  System Monitoring: Use SAP monitoring tools to check for performance bottlenecks. Tools like SAP Solution Manager can help identify issues in the system.
  
  
  Configuration Review: Review the configuration settings in your BW or HANA system. Ensure that they are set up correctly and are optimized for your specific use case.
  
  
  SAP Notes and Support: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates available that can resolve the issue.
  
  
  Consult SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. They can provide more specific guidance based on your system's configuration and logs.
  
  
  Related Information:
  
  SAP BW and HANA Documentation: Review the official SAP documentation for BW and HANA for best practices on performance tuning and resource management.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Performance Tuning Guides: Look for performance tuning guides specific to your version of SAP BW or HANA, as they may provide insights into managing resource contention.
  
  By following these steps, you should be able to diagnose and resolve the UJD_EXCEPTION284 error effectively.