How To Fix /SCDL/DL_DBAL_ERROR020 - Error when locking

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCDL/DL_DBAL_ERROR -

• Message number: 020

• Message text: Error when locking

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCDL/DL_DBAL_ERROR020 - Error when locking ?

  The SAP error message /SCDL/DL_DBAL_ERROR020 typically indicates a database locking issue within the SAP system, particularly related to the Data Lifecycle Management (DLM) component. This error can occur when there is an attempt to lock a database object, but the lock cannot be acquired due to various reasons.
  Causes:
  
  Concurrent Access: Another process or user may already have a lock on the database object you are trying to access.
  Long-Running Transactions: A transaction that is taking too long to complete may hold locks longer than expected, preventing other transactions from acquiring the necessary locks.
  Deadlocks: Situations where two or more transactions are waiting for each other to release locks can lead to deadlocks.
  Database Configuration Issues: Misconfigurations in the database settings or insufficient resources can lead to locking issues.
  Network Issues: Temporary network issues can cause communication problems between the application and the database, leading to lock acquisition failures.
  
  Solutions:
  
  
  Identify and Terminate Blocking Sessions:
  
  Use transaction codes like SM12 to view and manage locks. You can identify which user or process is holding the lock and terminate it if necessary.
  
  
  
  Check for Long-Running Transactions:
  
  Use transaction codes like SM66 or SM50 to monitor active processes and identify any long-running transactions that may be causing locks.
  
  
  
  Review Application Logic:
  
  Ensure that your application logic is optimized to minimize the duration of locks. This may involve reviewing the code to ensure that locks are acquired and released as quickly as possible.
  
  
  
  Database Tuning:
  
  Review and optimize database settings to ensure that they are configured correctly for your workload. This may involve adjusting parameters related to locking and transaction management.
  
  
  
  Increase Resources:
  
  If the issue is related to resource constraints, consider increasing the resources available to the database server (CPU, memory, etc.).
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Contact SAP Support:
  
  If the issue persists and you are unable to resolve it, consider reaching out to SAP Support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (Display and Delete Locks), SM50 (Work Process Overview), and SM66 (Global Work Process Overview).
  Monitoring Tools: Utilize SAP monitoring tools to keep an eye on system performance and locking behavior.
  Documentation: Review SAP documentation related to Data Lifecycle Management and database locking mechanisms for a deeper understanding.
  
  By following these steps, you should be able to diagnose and resolve the /SCDL/DL_DBAL_ERROR020 error effectively.