Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 Link File

The ORA-39126 error indicates that an unhandled exception was detected internally within a worker process during a Data Pump job, whether export or import. Oracle's official documentation classifies this as an internal error that may require contacting Oracle Support for resolution. However, in many cases, the root cause is known, and specific workarounds or patches exist.

Run impdp with LOGFILE and TRACE to see preceding errors:

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

| Bug Number | Versions Affected | Description | |------------|-------------------|-------------| | 19728326 | 12.1.0.1, 12.1.0.2 | Worker fatal error with LOBs in partitioned tables | | 30578343 | 18c, 19.3-19.8 | Error 71 with XMLType or nested tables | | 35038710 | 19.9-19.14 | Corrupt worker state when importing stats | | 26257043 | 12.2, 18c | KUPW-ERROR 71 with deferred segment creation | The ORA-39126 error indicates that an unhandled exception

He restarted the import script.

This comprehensive technical guide breaks down why this crash happens and provides actionable steps to fix it. 🔍 Root Causes of the Error

Corrupted table statistics in the dump file ( TABLE_STATISTICS ) can trigger this, especially if EXCLUDE=STATISTICS is not used. 2. Preliminary Troubleshooting Steps Run impdp with LOGFILE and TRACE to see

Now came the moment of truth. You can't just "resume" a dead worker. He had to restart the job, but thankfully, Data Pump is smart. Because he had used the REUSE_DUMPFILE parameter and the job had failed, he knew the master table would allow him to restart from a checkpoint if he attached to the job—or, more safely, simply restart the import command to let it reconcile the partial data.

Prevention is far more efficient than cure. To minimize the risk of ORA-39126:

: Moving dump files across distinct Oracle database versions (e.g., from an older release like 11g to a newer release like 12c or 19c) can trigger unhandled edge cases in the data preparation code. 🔍 Root Causes of the Error Corrupted table

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 .

For a quick data recovery, performing an import with CONTENT=DATA_ONLY will load only the data. The schema objects on the target database must already exist for this to work.

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71]

The Oracle Data Pump utility ( impdp ) is a robust and highly optimized tool for database migrations, upgrades, and backups. However, it can occasionally halt with cryptic internal framework exceptions. One of the most disruptive errors database administrators (DBAs) face is: