How To Fix AREN111 - Serial execution decreases performance

SAP Error Message - Details

• Message type: E = Error

• Message class: AREN - Messages - Archiving Engine

• Message number: 111

• Message text: Serial execution decreases performance

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Parallel processing is not active in the execution options. Serial
execution decreases performance. Because database access to the header
table is set for each package for technical reasons, the runtime for
objects without an appropriate index to the header table increases
disproportionately. Access is primarily by means of selection in the
ARCHIVE_STATUS field. For this reason, serial execution is only
suitable for small numbers of objects.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AREN111 - Serial execution decreases performance ?

  The SAP error message AREN111, which states "Serial execution decreases performance," typically indicates that a process or transaction is being executed in a serial manner rather than in parallel. This can lead to performance issues, especially in environments where multiple processes could be executed concurrently to improve efficiency.
  Cause:
  
  Configuration Settings: The system may be configured to run certain processes serially due to specific settings or limitations.
  Resource Contention: Limited system resources (CPU, memory, etc.) may force the system to execute tasks serially.
  Process Dependencies: Some processes may have dependencies that require them to be executed in a specific order, preventing parallel execution.
  Custom Code: Custom ABAP code or enhancements may be designed in a way that does not allow for parallel processing.
  Database Locks: If database locks are held by one process, other processes may be forced to wait, leading to serial execution.
  
  Solution:
  
  Review Configuration: Check the configuration settings in the SAP system to ensure that parallel processing is enabled where applicable.
  Optimize Processes: Analyze the processes that are running serially and see if they can be optimized for parallel execution. This may involve modifying custom code or changing the way certain transactions are executed.
  Increase Resources: If resource contention is an issue, consider upgrading hardware or optimizing the existing resource allocation to allow for better parallel processing.
  Check for Locks: Use transaction codes like SM12 to check for database locks that may be causing delays. Resolve any unnecessary locks.
  Batch Processing: If applicable, consider using batch processing techniques to allow multiple transactions to be processed simultaneously.
  Performance Analysis: Utilize tools like ST03N (Workload Analysis) or ST05 (SQL Trace) to analyze performance and identify bottlenecks.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to AREN111. SAP frequently updates its knowledge base with solutions for specific error messages.
  Performance Tuning: Engage in performance tuning activities, which may include analyzing the workload, optimizing database queries, and reviewing system logs for any anomalies.
  Documentation: Refer to SAP documentation for best practices on configuring and optimizing parallel processing in your specific SAP environment.
  
  By addressing the underlying causes of the AREN111 error, you can improve the performance of your SAP system and reduce the impact of serial execution on your operations.