How To Fix SQLRQW021 - Some work processes (WPs) ran in parallel; use summary for individual WPs

SAP Error Message - Details

• Message type: E = Error

• Message class: SQLRQW - Message class for SQL Trace Interpreter

• Message number: 021

• Message text: Some work processes (WPs) ran in parallel; use summary for individual WPs

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 SQLRQW021 - Some work processes (WPs) ran in parallel; use summary for individual WPs ?

  The SAP error message SQLRQW021 indicates that some work processes (WPs) in the SAP system ran in parallel, and the system is suggesting that you use a summary to analyze the individual work processes. This message typically arises in the context of performance monitoring or when analyzing SQL statements executed by different work processes.
  Cause:
  
  Parallel Execution: The error occurs when multiple work processes are executing SQL statements simultaneously. This can happen in high-load scenarios where multiple users or background jobs are accessing the database concurrently.
  Resource Contention: If the database is under heavy load, it may lead to contention for resources, causing the system to generate this message.
  Configuration Issues: Sometimes, the configuration of the SAP system or the database may not be optimized for handling parallel processing effectively.
  
  Solution:
  
  Analyze Work Processes: Use transaction codes like SM50 or SM66 to monitor the work processes. Check which processes are running and what SQL statements they are executing.
  Database Performance Tuning: Review the database performance and consider tuning it. This may involve:
  
  Optimizing SQL queries.
  Adding indexes to frequently accessed tables.
  Analyzing execution plans for slow-running queries.
  
  
  Adjust SAP Parameters: Review and adjust SAP parameters related to parallel processing and database connections. Parameters like rdisp/wp_no (number of work processes) and rdisp/wp_db (number of database work processes) may need to be tuned.
  Use Summary Reports: As suggested by the error message, use summary reports to get an overview of the performance of individual work processes. This can help identify which processes are causing issues.
  Check for Locks: Use transaction SM12 to check for any database locks that might be causing delays in processing.
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or updates that might address this issue.
  
  Related Information:
  
  Transaction Codes:
  
  SM50: Monitor work processes.
  SM66: Monitor all work processes in the system.
  ST22: Analyze dumps that may provide insights into errors.
  ST04: Database performance analysis.
  
  
  Performance Monitoring: Regularly monitor the performance of your SAP system and database to prevent issues related to parallel processing.
  Documentation: Refer to SAP documentation for best practices on performance tuning and managing work processes.
  
  By following these steps, you should be able to diagnose and resolve the underlying issues causing the SQLRQW021 error message in your SAP system.