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

If validation fails, re-export the source data.

This error indicates that a worker process encountered an unexpected fatal error while preparing data for import. The error can occur due to various reasons, including:

Because ORA-39126 is an unhandled internal exception wrapper, the true culprit is often found in subsequent lines of the error log or the database alert log. In the context of PREPARE_DATA_IMP [71] , the error usually boils down to a handful of architectural issues: 1. Data Pump Metadata Component Corruption

If the import succeeds, the issue lies in direct path’s handling of your data.

Proactive steps can significantly reduce the likelihood of encountering ORA-39126 errors. If validation fails, re-export the source data

impdp ... PARALLEL=1

Identify the table that fails (e.g., SCOTT.DATA_TABLE ) and exclude it:

Running the import as SYSDBA rather than a standard user with DATAPUMP_IMP_FULL_DATABASE privileges can lead to unexpected behavior.

To find out exactly why your worker process is failing, follow this systematic diagnostic path: 1. Analyze the Contextual Error Stack In the context of PREPARE_DATA_IMP [71] , the

: After exporting a dump file, always verify its integrity before moving or importing it.

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

Corrupt or invalid KUPW$WORKER or DBMS_METADATA package bodies can prevent the worker from initializing correctly.

The is a complex, often frustrating error, but it is rarely insurmountable. By understanding that it signals a failure during the data preparation phase—often tied to LOBs, XML, spatial data, or conversion logic—you can systematically narrow down the root cause. often frustrating error

Troubleshooting ORA-39126: Worker Unexpected Fatal Error in KUPW$WORKER.PREPARE_DATA_IMP [71]

impdp ... FULL=Y SQLFILE=check.sql

ALTER SYSTEM SET "_disable_asynch_sampling"=TRUE; (Consult with a DBA before changing hidden parameters). Summary Checklist

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