How To Fix RSENQ078 - Collector already started by user &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RSENQ - Lock Manager

• Message number: 078

• Message text: Collector already started by user &1

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 RSENQ078 - Collector already started by user &1 ?

  The SAP error message RSENQ078 indicates that a data collector process has already been started by another user. This typically occurs in the context of data collection processes in SAP BW (Business Warehouse) or similar environments where data is being collected or processed.
  Cause:
  The error is caused by the following scenarios:
  
  Concurrent Execution: Another user or process has already initiated the data collection process, and the system does not allow multiple instances of the same collector to run simultaneously.
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If a collector is already running, it locks the process, and any subsequent attempts to start the same collector will result in this error.
  
  Solution:
  To resolve the RSENQ078 error, you can take the following steps:
  
  
  Check Running Processes:
  
  Use transaction SM66 (Global Work Process Overview) or SM50 (Work Process Overview) to check if the collector is currently running. Look for the user ID mentioned in the error message.
  If you find the collector running, you may need to wait for it to complete.
  
  
  
  Terminate the Process:
  
  If the collector is stuck or taking too long, and you have the necessary authorizations, you can terminate the process. Be cautious with this step, as it may lead to data inconsistencies.
  In SM50, select the process and choose the option to "Cancel" or "Terminate".
  
  
  
  Check for User Sessions:
  
  Ensure that the user who started the collector is not logged in multiple times or has multiple sessions open that might be causing the conflict.
  
  
  
  Review Logs:
  
  Check the logs for any additional error messages or warnings that might provide more context about why the collector is running or if there are any underlying issues.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to the specific collector you are using for any known issues or additional troubleshooting steps.
  
  
  
  Contact SAP Support:
  
  If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM66, SM50, ST22 (Dump Analysis), and SLG1 (Application Log) for monitoring and troubleshooting.
  User Authorizations: Ensure that users have the appropriate authorizations to start and manage collectors.
  System Performance: Monitor system performance and resource utilization, as high load can sometimes lead to processes hanging or taking longer than expected.
  
  By following these steps, you should be able to address the RSENQ078 error effectively.