How To Fix SMMSS_DDIC011 - Clustered CS index cannot be created in tables with existing indexes

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 011

• Message text: Clustered CS index cannot be created in tables with existing indexes

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMMSS_DDIC011 - Clustered CS index cannot be created in tables with existing indexes ?

  The SAP error message SMMSS_DDIC011 indicates that there is an issue with creating a clustered column store (CS) index on a table that already has existing indexes. This error typically arises during the process of trying to optimize or modify the database schema, particularly when working with SAP HANA databases.
  Cause:
  The primary cause of this error is that a clustered column store index cannot coexist with existing non-clustered indexes on the same table. In SAP HANA, a table can only have one clustered index, and if there are already existing indexes (especially non-clustered ones), the system will not allow the creation of a new clustered index.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Identify Existing Indexes: Check the existing indexes on the table that is causing the error. You can do this by using SQL commands or through the SAP HANA Studio.
  SELECT * FROM M_INDEXES WHERE TABLE_NAME = 'your_table_name';
  
  
  Drop Existing Indexes: If the existing indexes are not needed, you can drop them. Be cautious with this step, as dropping indexes can impact performance for queries that rely on those indexes.
  DROP INDEX your_index_name ON your_table_name;
  
  
  Create the Clustered Index: After dropping the necessary indexes, you can proceed to create the clustered column store index.
  CREATE COLUMN TABLE your_table_name (
      column1 datatype,
      column2 datatype,
      ...
  ) WITH PRIMARY KEY (column1);
  
  
  Recreate Necessary Indexes: If you dropped any indexes that are still needed for performance, consider recreating them after the clustered index has been created.
  
  
  Review Table Design: If you frequently encounter this issue, it may be worth reviewing the design of your tables and indexes to ensure they align with best practices for SAP HANA.
  
  
  Related Information:
  
  SAP HANA Documentation: Refer to the official SAP HANA documentation for guidelines on index management and best practices.
  Performance Considerations: Understand the implications of dropping and creating indexes on performance, especially in production environments.
  Backup: Always ensure you have a backup of your data before making structural changes to your database.
  
  By following these steps, you should be able to resolve the SMMSS_DDIC011 error and successfully create the clustered column store index on your table.