Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 (2026)

The ORA-39126 error during Data Pump import generally indicates a metadata corruption issue or a conflict involving statistics, often manifesting as an ORA-01403 "no data found" error. Common solutions involve excluding statistics (EXCLUDE=STATISTICS) during the import or revalidating the Data Pump components using dpload.sql.For further discussion on this error, see the Oracle Support Community. 

Prevention

• Always transfer .dmp files in binary mode
• Ensure NLS_LANG matches between source and target
• Use the same Oracle version (or newer target, but not older) for export/import
• Validate dump files with impdp ... validate=full before production import
• Set FILESIZE to split large dumps rather than creating multi-gigabyte single files

Suggested immediate next actions for you The ORA-39126 error during Data Pump import generally

Note: In a Multitenant environment, ensure all PDBs are open and run this from the CDB. 2. Refresh Dictionary Statistics Always transfer

SELECT * FROM dba_datapump_jobs;
SELECT * FROM dba_datapump_errors WHERE job_name = 'YOUR_JOB_NAME';