How To Fix DD_CHK_COMPLEXITY201 - Maximum number of joined tables supported on all databases is &1

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_CHK_COMPLEXITY - Messages of CDS complexity check

• Message number: 201

• Message text: Maximum number of joined tables supported on all databases is &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DD_CHK_COMPLEXITY201 - Maximum number of joined tables supported on all databases is &1 ?

  The SAP error message DD_CHK_COMPLEXITY201 indicates that a query or operation is attempting to join more tables than the maximum limit allowed by the database. This limit can vary depending on the specific database system being used (e.g., Oracle, SQL Server, HANA, etc.). The error message specifies that the maximum number of joined tables supported is represented by &1.
  Cause:
  The primary cause of this error is that the SQL query or operation is trying to join more tables than the database can handle in a single query. Each database has its own limitations on the number of tables that can be joined in a single SQL statement, and exceeding this limit results in the error.
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Reduce the Number of Joins:
  
  Review the SQL query and see if you can reduce the number of tables being joined. This might involve:
  
  Eliminating unnecessary joins.
  Using subqueries or Common Table Expressions (CTEs) to break down the query into smaller parts.
  
  
  
  
  
  Optimize the Query:
  
  Analyze the query for optimization opportunities. Sometimes, restructuring the query can help reduce the complexity and the number of joins.
  
  
  
  Use Views:
  
  If certain joins are frequently used together, consider creating a database view that encapsulates those joins. This way, you can query the view instead of joining the tables directly in your main query.
  
  
  
  Check Database Documentation:
  
  Refer to the documentation of the specific database you are using to understand its limitations regarding the maximum number of joins. This can help you design your queries accordingly.
  
  
  
  Database Configuration:
  
  In some cases, it may be possible to adjust database settings or configurations to allow for more joins, but this is generally not recommended as it can lead to performance issues.
  
  
  
  Split the Query:
  
  If the query is too complex, consider splitting it into multiple simpler queries that can be executed sequentially, and then combine the results in your application logic.
  
  
  
  Related Information:
  
  
  Database-Specific Limits: Each database has its own limits for the number of joins. For example:
  
  Oracle: Typically allows up to 32 tables in a join.
  SQL Server: Allows up to 256 tables in a join.
  HANA: Has its own limits which may vary based on the version.
  
  
  
  Performance Considerations: Even if you can technically join a large number of tables, doing so can lead to performance degradation. Always consider the performance implications of complex queries.
  
  
  SAP Notes: Check SAP Notes and Knowledge Base Articles for any specific recommendations or patches related to this error message.
  
  
  By following these steps, you should be able to address the DD_CHK_COMPLEXITY201 error and optimize your queries effectively.