How To Fix DT739 - Buffering is only possible if all fields are NOT NULL

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 739

• Message text: Buffering is only possible if all fields are NOT NULL

What causes this issue?

The table is buffered.

System Response

The technical settings will not be activated because the property "Write
access only with Jave" was also selected for this table. This
combination is only possible if all the fields of the table have the
property NOT NULL.

How to fix this error?

You can remove the property 'Write access only with Java'. Switching
off the table buffer would also be an option. If you wish to set the
fields to NOT NULL, remember that this can be a lengthy operation -
depending on the database.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT739 - Buffering is only possible if all fields are NOT NULL ?

  The SAP error message DT739, which states "Buffering is only possible if all fields are NOT NULL," typically occurs in the context of database table buffering in SAP. This error indicates that the system cannot enable buffering for a particular database table because one or more fields in the table are defined as nullable (i.e., they can contain NULL values). Buffering in SAP requires that all fields in the table must be defined as NOT NULL to ensure data integrity and consistency.
  Cause:
  
  Nullable Fields: The table has one or more fields that are defined to allow NULL values. This is a common scenario in database design where certain fields may not always have a value.
  Buffering Configuration: The buffering settings for the table are being configured in a way that requires all fields to be NOT NULL.
  
  Solution:
  To resolve the DT739 error, you can take the following steps:
  
  
  Check Table Definition:
  
  Go to the Data Dictionary (transaction SE11) and check the definition of the table that is causing the error.
  Identify any fields that are defined as nullable (i.e., they allow NULL values).
  
  
  
  Modify Field Attributes:
  
  If possible, change the attributes of the nullable fields to NOT NULL. This may involve altering the database schema and ensuring that all existing records in the table comply with this change (i.e., they must have valid values for those fields).
  Note that changing a field from NULL to NOT NULL may require data migration or cleanup to ensure that no existing records violate the NOT NULL constraint.
  
  
  
  Re-evaluate Buffering Needs:
  
  If changing the field attributes is not feasible (e.g., due to business requirements), consider whether buffering is necessary for this table. If buffering is not critical, you can choose to disable buffering for the table.
  To disable buffering, go to the table definition in SE11, navigate to the "Technical Settings," and set the buffering option to "No buffering."
  
  
  
  Test Changes:
  
  After making the necessary changes, test the application or process that was generating the error to ensure that the issue is resolved.
  
  
  
  Related Information:
  
  Buffering Types: SAP supports different types of buffering (single record buffering, full table buffering, etc.). Understanding the specific requirements for your application can help determine the best approach.
  Impact of Buffering: Enabling buffering can improve performance by reducing database access, but it also requires careful consideration of data consistency, especially in multi-user environments.
  Documentation: Refer to SAP documentation and best practices regarding database table design and buffering to ensure compliance with SAP standards.
  
  If you are unsure about making changes to the database schema or buffering settings, it is advisable to consult with a database administrator or an SAP technical consultant.