How To Fix XMS_PERF602 - Cannot lock aggregation table

SAP Error Message - Details

• Message type: E = Error

• Message class: XMS_PERF - Integration Engine: Messages XI Performance

• Message number: 602

• Message text: Cannot lock aggregation table

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message XMS_PERF602 - Cannot lock aggregation table ?

  The SAP error message XMS_PERF602: Cannot lock aggregation table typically occurs in the context of SAP BW (Business Warehouse) or SAP HANA when there is an issue with locking the aggregation tables during data processing or reporting. This error can arise due to various reasons, including concurrent access, database locks, or issues with the underlying data model.
  Causes:
  
  Concurrent Access: Multiple processes or users may be trying to access or modify the aggregation table simultaneously, leading to a lock contention.
  Long-Running Transactions: A transaction that takes a long time to complete may hold a lock on the aggregation table, preventing other processes from accessing it.
  Database Locking Mechanisms: The database may have its own locking mechanisms that prevent access to the table.
  System Performance Issues: High system load or performance issues can lead to delays in releasing locks.
  Configuration Issues: Incorrect configuration of the data model or aggregation settings can also lead to locking issues.
  
  Solutions:
  
  Check for Active Sessions: Use transaction codes like SM12 (to check for locks) and SM66 (to monitor active processes) to identify if there are any active sessions holding locks on the aggregation table.
  Terminate Long-Running Transactions: If you identify any long-running transactions that are holding locks, consider terminating them if they are not critical.
  Optimize Queries: Review and optimize any queries that may be causing excessive locking. This can include reducing the complexity of queries or breaking them into smaller parts.
  Increase Lock Timeout: If appropriate, consider increasing the lock timeout settings in the database or SAP BW to allow longer wait times for locks to be released.
  Schedule Data Loads During Off-Peak Hours: If possible, schedule data loads or heavy reporting tasks during off-peak hours to minimize contention for locks.
  Review Aggregation Settings: Ensure that the aggregation settings in your data model are correctly configured to minimize locking issues.
  Database Maintenance: Perform regular database maintenance tasks to ensure optimal performance and reduce the likelihood of locking issues.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the specific error message for any patches or updates that may address the issue.
  System Logs: Review system logs (transaction SLG1) for any additional error messages or warnings that may provide more context.
  Performance Monitoring: Use tools like ST03N (Workload Analysis) to monitor system performance and identify any bottlenecks.
  Documentation: Refer to SAP documentation for best practices on managing locks and performance in SAP BW or HANA environments.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.