How To Fix MQ160 - System lock could not be completed

SAP Error Message - Details

• Message type: E = Error

• Message class: MQ - Messages for Euro Changeover Package

• Message number: 160

• Message text: System lock could not be completed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MQ160 - System lock could not be completed ?

  The SAP error message MQ160, which states "System lock could not be completed," typically occurs in the context of SAP's message queue (MQ) processing. This error indicates that a system lock could not be established or released, which can lead to issues in processing messages or transactions.
  Causes:
  
  Lock Contention: Multiple processes or users are trying to access the same resource simultaneously, leading to contention for locks.
  Database Issues: Problems with the underlying database, such as deadlocks or connection issues, can prevent locks from being acquired or released.
  Configuration Issues: Incorrect configuration settings in the SAP system or the message queue can lead to locking problems.
  System Performance: High system load or performance issues can delay the processing of locks, causing timeouts.
  Transport Issues: If the error occurs during a transport process, it may be due to issues with the transport layer or the objects being transported.
  
  Solutions:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. If there are stale or unnecessary locks, they can be deleted.
  Analyze System Performance: Monitor system performance using transaction codes like ST22 (dump analysis) and SM66 (global work process overview) to identify any bottlenecks.
  Review Configuration: Ensure that the configuration settings for the message queue and related components are correct. This may involve checking settings in transaction SMQS (queue monitoring).
  Database Health Check: Perform a health check on the database to ensure there are no underlying issues affecting lock management.
  Increase Timeout Settings: If the issue is related to timeouts, consider increasing the timeout settings for locks in the system configuration.
  Restart Processes: If a specific process is causing the issue, restarting the relevant work processes or the entire application server may help resolve the lock contention.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches.
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM21: System log for monitoring system messages.
  ST22: Dump analysis for checking runtime errors.
  SM66: Global work process overview to monitor active processes.
  SMQS: Queue monitoring for message queues.
  
  
  
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance, providing them with detailed logs and error messages.
  
  
  Documentation: Review SAP documentation related to message queues and locking mechanisms for a deeper understanding of how these systems operate.
  
  
  By following these steps, you should be able to diagnose and resolve the MQ160 error in your SAP environment.