How To Fix RSDBMAN004 - - Parallel subaccesses ended; serial accesses exist

RSDBMAN004 - Overview

• Message type: E = Error

• Message class: RSDBMAN -

• Message number: 004

• Message text: - Parallel subaccesses ended; serial accesses exist

What causes this issue?

All subaccesses that can be processed in parallel are processed. Some
subaccesses to be processed sequentially remain. This is described in
the documentation on processing queries under <ZK>Partial Parallel
Processing</>.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDBMAN004 - - Parallel subaccesses ended; serial accesses exist ?

  The SAP error message RSDBMAN004 - Parallel subaccesses ended; serial accesses exist typically occurs in the context of data extraction or reporting processes, particularly when using the SAP BW (Business Warehouse) or SAP HANA systems. This error indicates that while the system attempted to execute parallel data accesses, it encountered some serial accesses that prevented it from fully utilizing parallel processing capabilities.
  
  Cause:
  
  Data Locking: The presence of locks on certain data records can force the system to revert to serial processing for those records.
  Data Model Configuration: Certain configurations in the data model or queries may not support parallel processing.
  Resource Constraints: Limited system resources (CPU, memory) can lead to a fallback to serial processing.
  Query Design: Inefficient query design or complex joins can lead to serial execution paths.
  Database Configuration: The underlying database settings may not be optimized for parallel processing.
  
  
  Solution:
  
  Check Locks: Investigate if there are any locks on the data being accessed. You