How To Fix MMRP01554 - LiveCache lock-conflict

SAP Error Message - Details

• Message type: E = Error

• Message class: MMRP01 - Rapid Planning Matrix

• Message number: 554

• Message text: LiveCache lock-conflict

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MMRP01554 - LiveCache lock-conflict ?

  The SAP error message MMRP01554 indicates a lock conflict in LiveCache, which is a component used in SAP for managing large amounts of data in real-time, particularly in applications like Advanced Planning and Optimization (APO). This error typically arises when multiple processes attempt to access or modify the same data simultaneously, leading to a conflict.
  Cause:
  
  Concurrent Access: Multiple users or processes are trying to access or modify the same data in LiveCache at the same time.
  Long-Running Transactions: A transaction that takes a long time to complete may hold locks longer than necessary, causing other transactions to wait and eventually time out.
  Deadlocks: Situations where two or more transactions are waiting for each other to release locks, leading to a deadlock scenario.
  Configuration Issues: Incorrect configuration of LiveCache or the underlying database can also lead to locking issues.
  
  Solution:
  
  Identify the Locking Process: Use transaction codes like SM12 (for database locks) and SM21 (for system logs) to identify which processes are holding locks.
  Terminate Conflicting Processes: If a process is holding a lock for too long, you may need to terminate it. This can be done through transaction SM12 or SM66 (for global processes).
  Optimize Transactions: Review and optimize the transactions that are causing the lock conflicts. Ensure that they are as efficient as possible and do not hold locks longer than necessary.
  Increase Lock Timeout: If appropriate, consider increasing the lock timeout settings in the system configuration to allow longer wait times for locks.
  Review LiveCache Configuration: Ensure that LiveCache is properly configured and that there are no issues with the underlying database that could be causing locking problems.
  Batch Processing: If applicable, consider using batch processing to reduce the number of concurrent accesses to the same data.
  
  Related Information:
  
  SAP Notes: Check for relevant SAP Notes that may provide additional insights or patches related to LiveCache locking issues.
  Performance Monitoring: Regularly monitor the performance of LiveCache and the transactions that interact with it to identify potential bottlenecks.
  Documentation: Refer to SAP documentation for best practices on managing LiveCache and handling locking issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with SAP support for further assistance.