How To Fix RSDD301 - Reading from aggregate &3 not possible due to block by user &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD - Message class for data manager

• Message number: 301

• Message text: Reading from aggregate &3 not possible due to block by user &1

What causes this issue?

Data is read from aggregate &V3& in InfoCube &V2& for the creation of
an aggregate. To ensure that the data in aggregate &V3& has not changed
during the reading, an attempt was made to set a lock.
The aggregate is, however, already blocked by another transaction from
user &V1&.
Either the data in aggregate &V3& is currently being created or user
&V1& is currently changing the definition of the aggregate.

System Response

Reading from aggregate &V3& is not currently possible.

How to fix this error?

Check why aggregate &V3& is blocked by user &V1&, and start the
transaction again at a later point in time.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD301 - Reading from aggregate &3 not possible due to block by user &1 ?

  The SAP error message RSDD301 indicates that there is an issue with reading from an aggregate in the SAP BW (Business Warehouse) system. The message typically states that the reading operation is blocked by a specific user. Here’s a breakdown of the cause, potential solutions, and related information for this error:
  Cause:
  
  User Lock: The aggregate is currently locked by a user (identified as &1 in the error message). This can happen if a user is performing a long-running query or data load that is accessing the same aggregate.
  Transaction in Progress: A transaction that involves the aggregate is still in progress, preventing other users from accessing it.
  System Configuration: There may be system settings or configurations that are causing the aggregate to be locked for certain operations.
  
  Solution:
  
  
  Identify the Locking User: 
  
  Use transaction code SM12 to check for locks in the system. Look for the user ID mentioned in the error message. This will help you identify what process is holding the lock.
  
  
  
  Terminate the Lock: 
  
  If the locking user is not actively using the aggregate or if the process has hung, you may need to terminate the session or process that is holding the lock. This can be done through transaction SM12 by selecting the lock entry and deleting it.
  
  
  
  Wait for Completion: 
  
  If the locking user is performing a legitimate operation, it may be best to wait until they complete their task. You can communicate with the user to understand the situation.
  
  
  
  Check for Long-Running Queries: 
  
  If the issue is due to a long-running query, consider optimizing the query or the aggregate to reduce the time it takes to complete.
  
  
  
  Review System Settings: 
  
  Check the system settings related to locking mechanisms and aggregate access. Ensure that they are configured correctly to minimize conflicts.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM12: To view and manage lock entries.
  SM21: To check system logs for any related errors or warnings.
  ST22: To check for dumps that might provide additional context.
  
  
  
  Documentation: 
  
  Review SAP documentation on aggregates and locking mechanisms in BW for a deeper understanding of how they work and best practices for managing them.
  
  
  
  Performance Tuning: 
  
  Consider performance tuning for aggregates and queries to reduce the likelihood of locks occurring in the future.
  
  
  
  By following these steps, you should be able to resolve the RSDD301 error and prevent it from occurring in the future.