Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 !!top!! Jun 2026

impdp ... EXCLUDE=VIEW,EXCLUDE=PROCACT_INSTANCE

Or, check the Data Pump master table:

Run the import command as a standard user with the appropriate Data Pump roles instead of using / as sysdba . 4. Check for Specific Patches

The ORA-39126 error is a generic "wrapper" error in Oracle Data Pump that indicates a worker process has crashed unexpectedly. When paired with the specific internal procedure KUPW$WORKER.PREPARE_DATA_IMP and the error code [71], it typically points to a failure during the metadata loading phase of an import (IMPDP) operation.

If you want, I can draft a concise incident report email for stakeholders including timeline, impact, and next steps — tell me the desired recipients and tone. Check for Specific Patches The ORA-39126 error is

The solution for the ORA-39126 error depends on the root cause of the issue. Some possible solutions include:

: This is the internal routine within the worker package where the error was triggered. This specific method handles the preparation and metadata mapping for rows before actual data loading commences.

For more specific guidance, you can check the Oracle Community Discussion or consult on My Oracle Support.

Data Pump uses a master table ( SYS_IMPORT_TABLE_xx ) to keep track of operations. If this table is corrupted, restart the job using impdp ... TABLE_EXISTS_ACTION=TRUNCATE . The solution for the ORA-39126 error depends on

How it helps : This bypasses the problematic metadata preparation phase entirely, only loading row data. Command :

This error typically occurs during the phase ( impdp ), specifically when the Data Pump worker process is preparing to load data into a table. The error is a "wrapper" or "umbrella" error—meaning it signals a fatal failure, but the root cause is often hidden in a secondary error stack or requires deep investigation.

The key component is KUPW$WORKER , which is the PL/SQL package responsible for managing worker processes in Data Pump. The tag is a specific code indicating where in the PREPARE_DATA_IMP procedure the failure occurred, often associated with unexpected data types, large LOB segments, or mismatched metadata during object creation. 2. Common Causes

The error is a generic internal error in Oracle Data Pump that typically indicates an unhandled exception within the worker process during the data import preparation phase. Root Causes Share public link

Importing a dump file from a much higher Oracle version into a lower version without using the VERSION parameter correctly. Step-by-Step Solutions 1. Exclude Statistics

Invalid objects related to the Data Pump utility or XML processing can trigger this error during the "prepare" phase. Unsupported Datatypes: Tables containing specific datatypes like

Does the error happen or after some data has already been loaded? Share public link