How To Fix C2166 - Internal: Error when compressing or decompressing data

SAP Error Message - Details

• Message type: E = Error

• Message class: C2 - Other messages production orders

• Message number: 166

• Message text: Internal: Error when compressing or decompressing data

What causes this issue?

An internal error arose on compressing or decompressing data.
Setup parameters of workbench functions are compressed and decompressed
for internal handling. Parameter handling becomes impossible if an
error occurs here.

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 error must be investigated by SAP. You should inform your systems
administrator.

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 C2166 - Internal: Error when compressing or decompressing data ?

  The SAP error message C2166, which states "Internal: Error when compressing or decompressing data," typically indicates an issue related to data compression or decompression processes within the SAP system. This error can occur in various contexts, such as during data transfer, archiving, or when handling large datasets.
  Causes:
  
  Data Corruption: The data being processed may be corrupted, leading to issues during compression or decompression.
  Insufficient Memory: The system may not have enough memory allocated to handle the compression or decompression tasks.
  Software Bugs: There may be bugs in the SAP software or specific patches that need to be applied.
  Configuration Issues: Incorrect configuration settings related to data handling or compression algorithms can lead to this error.
  Database Issues: Problems with the underlying database, such as locks or inconsistencies, can also trigger this error.
  
  Solutions:
  
  Check Data Integrity: Verify the integrity of the data being processed. If the data is corrupted, you may need to restore it from a backup or correct the issues.
  Increase Memory Allocation: If the error is related to memory, consider increasing the memory allocation for the SAP application server.
  Apply Patches: Check for any available patches or updates from SAP that address known issues related to data compression or decompression.
  Review Configuration Settings: Ensure that the configuration settings for data handling and compression are correctly set according to SAP best practices.
  Database Maintenance: Perform database maintenance tasks, such as checking for locks, inconsistencies, or running database optimization procedures.
  Check Logs: Review the SAP application logs (transaction SM21) and the developer traces (transaction ST22) for more detailed error messages that can provide additional context.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for assistance, especially if it appears to be a bug or a more complex issue.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide guidance on troubleshooting.
  Transaction Codes: Familiarize yourself with transaction codes like SM21 (System Log), ST22 (Dump Analysis), and SNOTE (SAP Note Assistant) for troubleshooting.
  Documentation: Review SAP documentation related to data handling, compression, and performance tuning for additional insights.
  
  By following these steps, you should be able to diagnose and resolve the C2166 error in your SAP environment.