How To Fix DT225 - Table &: key length > & (Buffering not possible)

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 225

• Message text: Table &: key length > & (Buffering not possible)

What causes this issue?

The key length of the table, i.e. the sum of the lengths of all the key
fields of the table, is too large for tables to be buffered.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

The table cannot be buffered. Before activating the table, remove the
entry for the buffering type from the technical settings.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT225 - Table &: key length > & (Buffering not possible) ?

  The SAP error message DT225 indicates that the key length of a specified table exceeds the maximum allowed length for buffering. This error typically arises when you attempt to enable buffering for a database table that has a key length greater than what SAP allows for buffered tables.
  Cause:
  
  Key Length Exceeds Limit: The primary cause of this error is that the key length of the table in question exceeds the maximum limit set by SAP for buffered tables. In SAP, the maximum key length for buffering is generally 255 bytes.
  Table Configuration: The table may have been defined with a composite key or a long primary key that surpasses this limit.
  
  Solution:
  
  
  Disable Buffering: If buffering is not essential for the table, you can disable buffering for that table. This can be done in the Data Dictionary (SE11):
  
  Go to transaction SE11.
  Enter the table name and click on "Display."
  Click on "Technical Settings."
  Change the buffering option to "No buffering."
  Save your changes.
  
  
  
  Review Table Design: If buffering is necessary for performance reasons, consider redesigning the table:
  
  Reduce Key Length: If possible, modify the key fields to reduce the overall key length.
  Use Alternative Keys: Consider using alternative keys that have a shorter length and can still meet your access requirements.
  
  
  
  Consult Documentation: Review SAP documentation or consult with your SAP Basis team for best practices regarding table buffering and key design.
  
  
  Related Information:
  
  Buffering in SAP: Buffering is a performance optimization technique that allows frequently accessed data to be stored in memory, reducing database access time.
  Key Length Limits: Familiarize yourself with the limits imposed by SAP on key lengths for different types of tables (transparent tables, pooled tables, etc.).
  Performance Considerations: Understand the trade-offs between enabling buffering for performance and the limitations imposed by key lengths.
  
  If you continue to experience issues or if the table design is critical, it may be beneficial to engage with SAP support or a consultant who specializes in SAP database design and performance optimization.