How To Fix RSUOM161 - Secondary index on SID columns created (&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: RSUOM - BW: Conversion of Units of Measure

• Message number: 161

• Message text: Secondary index on SID columns created (&1)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSUOM161 - Secondary index on SID columns created (&1) ?

  The SAP error message RSUOM161 indicates that a secondary index on SID (Surrogate ID) columns has been created for a specific InfoObject. This message typically arises in the context of SAP BW (Business Warehouse) and is related to the handling of master data and its associated attributes.
  Cause:
  The error message RSUOM161 is usually triggered when:
  
  A secondary index is created on SID columns for an InfoObject, which may not be necessary or optimal.
  There may be performance implications or redundancy in having a secondary index on SID columns, as these columns are already indexed by default.
  
  Solution:
  To resolve the RSUOM161 error, consider the following steps:
  
  
  Review the Need for the Secondary Index:
  
  Assess whether the secondary index on the SID columns is truly necessary. In many cases, the primary index on the SID columns suffices for performance.
  
  
  
  Remove the Secondary Index:
  
  If the secondary index is not needed, you can remove it. This can typically be done through the Data Warehousing Workbench (transaction RSA1) or by using the appropriate database management tools.
  
  
  
  Optimize Data Model:
  
  Review the data model and ensure that the design is optimal. Sometimes, restructuring the InfoObjects or the way data is loaded can eliminate the need for additional indexes.
  
  
  
  Check for Updates:
  
  Ensure that your SAP BW system is up to date with the latest support packages and notes, as SAP may provide fixes or recommendations for handling such scenarios.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes that may provide additional insights or specific instructions related to this error message. You can search for notes in the SAP Support Portal.
  
  
  
  Related Information:
  
  SID (Surrogate ID): In SAP BW, SIDs are unique identifiers for master data records. They are used to link fact tables with dimension tables.
  Indexes in SAP BW: Indexes are crucial for performance in data retrieval. However, unnecessary indexes can lead to increased overhead during data loading and maintenance.
  Performance Tuning: Regularly monitor and tune the performance of your BW system, especially after changes to the data model or after significant data loads.
  
  If you continue to experience issues or if the error message persists after following the above steps, consider reaching out to SAP support for further assistance.