How To Fix WA857 - Error reading event queue

SAP Error Message - Details

• Message type: E = Error

• Message class: WA - Messages from Workflow Event Manager

• Message number: 857

• Message text: Error reading event queue

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WA857 - Error reading event queue ?

  The SAP error message WA857: Error reading event queue typically indicates a problem with the event queue processing in the SAP system. This error usually occurs in the context of dialog or update tasks where the system tries to read or process events from the event queue but encounters an issue.
  
  Cause
  
  Event Queue Corruption or Inconsistency: The event queue, which holds events for processing, might be corrupted or inconsistent.
  Database or Buffer Issues: Problems with database access or buffer inconsistencies can cause the system to fail reading the event queue.
  System Load or Resource Constraints: High system load or insufficient resources (memory, CPU) can lead to timeouts or failures in event queue processing.
  Transport or Network Issues: If the event queue is distributed or involves communication between different application servers, network problems can cause read errors.
  Program or Kernel Bugs: In rare cases, bugs in the SAP kernel or application code can cause this error.
  
  
  Solution
  
  
  Check System Logs and Dumps:
  
  Use transaction SM21 to check system logs for related errors.
  Use ST22 to check for short dumps that might give more context.
  
  
  
  Restart the Affected Work Processes:
  
  Sometimes, restarting the dialog or update work processes can clear transient issues.
  
  
  
  Check and Clear Event Queue:
  
  Use transaction SMQ1 (Outbound Queue) and SMQ2 (Inbound Queue) to check for stuck or inconsistent queues.
  If queues are stuck, try to process or delete problematic entries carefully.
  
  
  
  Check System Resources:
  
  Monitor system load via ST06, ST03N, or OS-level tools.
  Ensure sufficient memory and CPU are available.
  
  
  
  Apply SAP Notes:
  
  Search the SAP Support Portal for notes related to WA857 or event queue errors.
  Apply relevant kernel patches or support packages if a bug is identified.
  
  
  
  Database Consistency Check:
  
  Run database consistency checks if database corruption is suspected.
  Consult your DBA for database health.
  
  
  
  Network and Transport Checks:
  
  Verify network stability if the event queue involves communication between servers.
  Check for any recent changes in network or transport layers.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM21 – System Log
  ST22 – ABAP Dump Analysis
  SMQ1 / SMQ2 – Queue Monitoring
  ST06 – OS Monitor
  ST03N – Workload Analysis
  
  
  
  SAP Notes:
  
  Search for notes with keywords like "WA857", "event queue", "error reading event queue".
  Example note numbers might vary depending on SAP version and kernel.
  
  
  
  SAP Kernel:
  
  Ensure the SAP kernel is up to date, as kernel bugs can cause event queue errors.
  
  
  
  Event Queue Concept:
  
  The event queue is used in SAP to manage asynchronous events, such as update tasks or dialog events.
  Proper functioning of the event queue is critical for system stability.
  
  
  
  
  If the problem persists after these steps, consider raising a support ticket with SAP, providing detailed logs, dumps, and system information for further analysis.