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

He realized what had happened. A developer had dropped a temporary table on the source system exactly as the export began, leaving a ghost entry in the export dump. The import worker reached for the ghost, found nothing, and panicked.

is a generic "Worker unexpected fatal error" that occurs during Oracle Data Pump operations. The specific sub-program KUPW$WORKER.PREPARE_DATA_IMP [71] typically points to an internal failure while the worker is preparing to import data rows into a table. Primary Causes & Solutions He realized what had happened

The full error message usually appears as: He realized what had happened