How To Fix DMCLG264 - Access plan has already been calculated

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 264

• Message text: Access plan has already been calculated

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMCLG264 - Access plan has already been calculated ?

  The SAP error message DMCLG264, which states "Access plan has already been calculated," typically occurs in the context of database access plans in SAP systems, particularly when working with the Data Management and Data Warehousing components. This error indicates that the system is attempting to recalculate an access plan that has already been generated for a particular query or operation.
  Cause:
  
  Duplicate Execution: The error often arises when a query or operation is executed multiple times without any changes to the underlying data or structure, leading the system to recognize that the access plan has already been established.
  Caching Mechanism: SAP uses caching mechanisms to optimize performance. If the system detects that an access plan is already cached, it may throw this error when it tries to recalculate it.
  Configuration Issues: There may be configuration settings that are causing the system to misinterpret the state of the access plan.
  
  Solution:
  
  Check Query Execution: Ensure that the query or operation is not being executed multiple times unnecessarily. If it is, consider optimizing the execution flow to avoid redundant calls.
  Clear Cache: If you suspect that the cache is causing the issue, you can try clearing the cache for the specific query or operation. This can often be done through transaction codes like SM12 (for lock entries) or SM21 (for system logs) to monitor and manage cache entries.
  Review Access Plan: Use transaction codes like ST05 (SQL Trace) to analyze the access plan and understand why it is being recalculated. This can help identify any underlying issues with the query or data model.
  Update Statistics: Ensure that the database statistics are up to date. Outdated statistics can lead to inefficient query plans and may cause the system to behave unexpectedly.
  Consult Documentation: Review SAP notes and documentation related to the specific version of your SAP system. There may be known issues or patches available that address this error.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance. They can provide more specific guidance based on your system configuration and version.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any updates or patches related to this error message. SAP frequently releases notes that address specific issues.
  Performance Tuning: Consider reviewing performance tuning guides for your specific SAP module, as optimizing queries and access plans can help prevent this error.
  Database Administration: If you have access to database administration tools, you may want to analyze the database performance and configuration to ensure that it is optimized for SAP operations.
  
  By following these steps, you should be able to diagnose and resolve the DMCLG264 error in your SAP environment.