How To Fix SMMSS_DDIC001 - A clustered index already exists: &1

SAP Error Message - Details

• Message type: E = Error

• Message class: SMMSS_DDIC - DDIC Messages for Microsoft SQL Server

• Message number: 001

• Message text: A clustered index already exists: &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMMSS_DDIC001 - A clustered index already exists: &1 ?

  The SAP error message SMMSS_DDIC001 indicates that there is an attempt to create a clustered index on a database table where a clustered index already exists. This situation typically arises during database operations such as table modifications, upgrades, or when executing certain ABAP programs that involve database schema changes.
  Cause:
  
  Existing Clustered Index: The primary cause of this error is that the database table already has a clustered index defined. In most databases, a table can only have one clustered index because the clustered index determines the physical order of data storage.
  Database Schema Changes: This error can occur during attempts to modify the database schema, such as adding a new index or changing the structure of the table.
  Development or Transport Issues: If there are inconsistencies in the transport requests or development objects, it may lead to attempts to create an index that already exists.
  
  Solution:
  
  Check Existing Indexes: Use transaction codes like SE11 (Data Dictionary) or SE14 (Database Utility) to check the existing indexes on the table. You can also use SQL queries to inspect the indexes directly in the database.
  Remove or Modify the Index: If you need to create a new clustered index, you may need to drop the existing one first. Be cautious with this approach, as it may affect application performance or data integrity.
  Adjust the ABAP Code: If the error arises from ABAP code, review the code to ensure it does not attempt to create an index that already exists. Modify the logic to check for the existence of the index before attempting to create it.
  Transport Request Review: If this error occurs during a transport, review the transport request to ensure that it does not contain conflicting changes. You may need to adjust the transport or resolve conflicts in the development environment.
  Database Administration: If you are not comfortable making changes to the database schema, consult with your database administrator (DBA) for assistance.
  
  Related Information:
  
  Database Documentation: Refer to the documentation for your specific database (e.g., SAP HANA, Oracle, SQL Server) for details on managing indexes.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Performance Considerations: Be aware that changing indexes can impact performance. Always test changes in a development or quality assurance environment before applying them to production.
  
  By following these steps, you should be able to resolve the error and ensure that your database operations proceed smoothly.