How To Fix FKKBIX426 - Block size for database access is reduced from &1 to &2

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKBIX - Conv.Inv.: Billing (Invoice Preprocessing)

• Message number: 426

• Message text: Block size for database access is reduced from &1 to &2

What causes this issue?

The value entered in the technical settings for the block size for
database access is too large. Only values between 1 and &V2& are
supported.

System Response

The block size defines the size of a COMMIT block in billing. By means
of the block size, you specify the maximum number of billing documents
that are created in an LUW (Logical Unit of Work). For example, for a
block size of 1, the system sets a COMMIT-WORK statement after each
billing document created; for a block size of 10, there is normally a
COMMIT after 10 billing documents are created. You should be aware that
the block size entered in the mass activity defines only the benchmark
for the size of a COMMIT block that is not allowed to be exceeded in
billing. The actual number of billing documents that can be processed in
a COMMIT block is determined internally by the program using additional
criteria, such as the number of billable items processed.

How to fix this error?

Use a value between 1 and &V2& for the block size.
Setting a COMMIT after a number of documents generally has a positive
effect on the runtime of billing.
A block size that is too small causes more frequent accesses to the
database; a block size that is too large increases the load on the main
memory and the system caused by the management of the data.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FKKBIX426 - Block size for database access is reduced from &1 to &2 ?

  The SAP error message FKKBIX426 indicates that the block size for database access has been reduced from a higher value (&1) to a lower value (&2). This typically occurs during the execution of a program or transaction that is trying to access a large amount of data from the database, and the system is adjusting the block size to optimize performance or to accommodate certain limitations.
  Cause:
  
  Data Volume: The program is attempting to process a large volume of data, which may exceed the optimal block size for database access.
  Database Configuration: The database settings or configurations may limit the maximum block size that can be used for data retrieval.
  Memory Constraints: The system may be experiencing memory constraints, leading to a reduction in the block size to prevent performance degradation.
  Transaction Type: Certain types of transactions or operations may inherently require a smaller block size due to their nature.
  
  Solution:
  
  Review Database Configuration: Check the database configuration settings to ensure that the block size is set appropriately for the expected data volume. Consult with your database administrator if necessary.
  Optimize Queries: If the error occurs during specific queries, consider optimizing those queries to reduce the amount of data being processed at once. This can include adding filters or pagination.
  Increase Memory Allocation: If memory constraints are causing the issue, consider increasing the memory allocation for the SAP application server or the database server.
  Adjust SAP Parameters: Review and adjust relevant SAP parameters that control database access and memory management. This may involve consulting SAP documentation or support.
  Monitor Performance: Use performance monitoring tools to analyze the system's performance and identify any bottlenecks that may be contributing to the issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Transaction Codes: Use transaction codes like ST22 (Dump Analysis) or SM21 (System Log) to check for any related dumps or logs that may provide additional context for the error.
  Database Logs: Review the database logs for any errors or warnings that may indicate underlying issues with database performance or configuration.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.