Error
Error Code:
129
SAP S/4HANA Error 129: Transaction Rollback Error
Description
Error 129, 'ERR_TX_ROLLBACK', indicates that a database transaction initiated within SAP S/4HANA failed and was automatically reversed to maintain data integrity. This typically occurs when the system encounters an unrecoverable issue during a data modification operation, preventing its successful completion.
Error Message
ERR_TX_ROLLBACK
Known Causes
4 known causesDatabase Deadlock or Concurrency
Multiple transactions attempting to access or modify the same data simultaneously can lead to a deadlock, forcing one transaction to roll back.
Resource Exhaustion
Insufficient system resources, such as memory or CPU, can prevent a transaction from completing, leading to its rollback.
Database Constraint Violation
The transaction attempted to commit data that violates a defined database constraint, such as a unique key or foreign key rule.
Network or Communication Failure
A temporary interruption in network connectivity between the SAP application server and the database server can abort an ongoing transaction.
Solutions
3 solutions available1. Investigate Transaction Logs for Specific Rollback Cause medium
Analyze detailed transaction logs to pinpoint the exact reason for the rollback.
1
Access the SAP Gateway logging. This can often be done via transaction SM21 (System Log). Look for entries around the time of the error.
2
In SM21, filter by 'Error' and potentially by user or transaction code if known. Look for specific error messages preceding or accompanying the ERR_TX_ROLLBACK.
Example filter criteria in SM21: "Error Type" = 'A' (Error), "Message Class" = 'S' (System), "Message Number" = '000' (or a relevant system message number).3
If the rollback is related to a specific database operation, examine the SAP trace files. Transaction ST05 (Performance Trace) can be enabled to capture SQL statements.
4
Analyze the trace file from ST05 for the problematic transaction. Look for any SQL errors, deadlocks, or constraint violations that might have triggered the rollback.
Example: Search for 'SQL Error' or 'ORA-' (for Oracle), 'SQL0' (for DB2), 'Msg ' in the trace output.5
Consult SAP Notes related to ERR_TX_ROLLBACK and the specific error messages found in the logs. These notes often provide known issues and solutions.
2. Review Database Resource Utilization and Performance medium
Check for database-level issues like deadlocks, insufficient memory, or disk space that could cause rollbacks.
1
Connect to the underlying database of your SAP S/4HANA system (e.g., HANA Studio, SQL Server Management Studio, Oracle Enterprise Manager).
2
Monitor database performance metrics, paying close attention to CPU usage, memory consumption, and I/O activity. High utilization can lead to timeouts and rollbacks.
For SAP HANA, use HANA Studio's Administration perspective or SQL queries like: SELECT * FROM SYS.M_SERVICE_RESOURCES;3
Check for active database deadlocks. These are a common cause of transaction rollbacks as the database aborts one of the conflicting transactions to resolve the deadlock.
For SAP HANA: SELECT * FROM SYS.M_DEADLOCK_EVENTS;4
Verify sufficient disk space is available for the database. Running out of disk space can cause various database operations to fail, leading to rollbacks.
SQL query (example for HANA): SELECT * FROM SYS.M_VOLUME_FILES;5
If resource constraints are identified, consider scaling up the database resources (CPU, RAM) or optimizing database queries and configurations.
3. Examine Application-Specific Logic and Custom Code advanced
Identify potential issues in custom ABAP code or specific SAP transactions that might be causing inconsistent states.
1
If the error occurs during a specific SAP transaction or process, thoroughly review the corresponding ABAP code. Look for any custom enhancements or modifications.
2
Pay close attention to how database updates are handled. Ensure that all database operations within a transaction are committed or rolled back consistently. Look for unhandled exceptions or programming errors.
Example ABAP considerations: Use of `COMMIT WORK` and `ROLLBACK WORK` statements, error handling blocks (`TRY...CATCH`), and the correct use of database locks.3
Use the ABAP Debugger to step through the code execution when the error occurs. This will help pinpoint the exact line of code causing the rollback.
4
If the issue is related to a standard SAP transaction with a known bug, check for relevant SAP Notes that might provide a correction or workaround.
5
Consider the possibility of data inconsistencies being introduced by custom logic. This might require data reconciliation or correction procedures.