: Specific versions of Oracle have known bugs (e.g., bug 28307854) that cause ORA-39126 when importing package bodies or certain metadata. Oracle Forums Common Solutions and Workarounds To resolve this error, try the following steps in order:
One of the most thoroughly documented causes for this specific error is an Oracle bug that occurs during the import of certain types of metadata. This is evident when the error is accompanied by .
: Using a newer export version to import into an older database version without setting the parameter correctly. Resource Issues
This is the most common resolution, particularly if the error occurs shortly after an database upgrade or patch. Rebuilding the packages ensures the internal Data Pump dictionary is valid. Log in as sysdba . Navigate to $ORACLE_HOME/rdbms/admin . : Specific versions of Oracle have known bugs (e
Summary
The KUPW$WORKER process is the core engine of Oracle Data Pump, responsible for orchestrating the export and import of database objects. When the worker dies from an unhandled exception, Oracle raises this error. While the main job may continue, any objects being processed by the failed worker will be incomplete or skipped altogether. Pinpointing the root cause is critical, as the error itself is a generic symptom of a variety of underlying problems.
Proactive steps can significantly reduce the likelihood of encountering ORA-39126 errors. : Using a newer export version to import
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Standard practice is to perform imports using a user with the DATAPUMP_IMP_FULL_DATABASE role (like SYSTEM ) rather than using the AS SYSDBA connection, which can cause unexpected behavior in worker processes.
: The target database lacked Oracle Spatial license or had MDSYS schema invalid objects. Log in as sysdba
The ORA-39126 error is a critical issue that requires immediate attention. By understanding the causes, symptoms, and solutions for this error, database administrators and developers can troubleshoot and resolve the issue efficiently. By following best practices for data validation, database configuration, and Data Pump job execution, the risk of encountering the ORA-39126 error can be minimized. If you are experiencing the ORA-39126 error, use the information provided in this article to guide your troubleshooting and resolution efforts.
to a non-system user can cause unexpected behavior in certain environments. Bug-related issues
The solution for the ORA-39126 error depends on the root cause of the issue. Some possible solutions include:
While intimidating, ORA-39126 is almost always solvable. Here are the most important takeaways:
If Data Pump continues to fail, export using legacy exp and import with imp (may lose advanced features but works for many data-only scenarios).