How To Fix DT556 - Online execution can cause timeouts

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 556

• Message text: Online execution can cause timeouts

What causes this issue?

The table for which an index is to be created or converted already has
very many entries. Creating the index will therefore last for some time
and may lead to a termination by exceeding the runtime.

System Response

The system offers you the chance to execute the index change as a
background job.

How to fix this error?

If a previous attempt already led to the runtime being exceeded, or if
this is likely, schedule the change as a background job.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT556 - Online execution can cause timeouts ?

  The SAP error message DT556, which indicates that "Online execution can cause timeouts," typically arises in the context of long-running operations or processes in SAP systems, particularly when executing reports or transactions that may take a significant amount of time to complete. This can lead to performance issues or timeouts, especially in environments with strict timeout settings.
  Causes:
  
  Long-Running Queries: The operation being executed may involve complex queries or data processing that takes longer than the allowed timeout period.
  System Performance: High system load or resource contention can slow down processing times, leading to timeouts.
  Network Issues: Poor network connectivity or latency can also contribute to the time it takes for the operation to complete.
  Configuration Settings: Timeout settings in the SAP system or the database may be configured too low for the operations being performed.
  
  Solutions:
  
  Optimize Queries: Review and optimize the queries or reports being executed to ensure they run more efficiently. This may involve indexing, reducing the amount of data processed, or breaking down complex operations into smaller parts.
  Increase Timeout Settings: If appropriate, consider increasing the timeout settings in the SAP system or database configuration to allow longer-running operations to complete.
  Batch Processing: If possible, switch to batch processing for long-running tasks instead of executing them online. This can help avoid timeouts and improve overall system performance.
  Monitor System Performance: Use SAP monitoring tools to check system performance and identify bottlenecks. Address any issues related to system resources, such as CPU, memory, or disk I/O.
  Network Optimization: Ensure that network connectivity is stable and optimized to reduce latency and improve response times.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to the DT556 error. SAP frequently updates its knowledge base with solutions for known issues.
  Transaction Codes: Use transaction codes like ST22 (Dump Analysis) and SM21 (System Log) to analyze any related dumps or logs that may provide more context on the error.
  Performance Tuning: Engage with SAP Basis or performance tuning experts to conduct a thorough analysis of the system and implement best practices for performance optimization.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of the DT556 error and improve the overall performance of your SAP system.