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

Stale or corrupt optimizer statistics in the source dump file can cause the worker to crash during the preparation phase.

The error is an internal exception within the Oracle Data Pump (impdp) utility. It occurs when a worker process encounters an unhandled state while preparing data for import, often leading to a premature job termination. Common Causes Stale or corrupt optimizer statistics in the source

This specific error is frequently linked to metadata inconsistencies or environment-specific bugs: Stale or corrupt optimizer statistics in the source

After running this, recompile any remaining invalid objects using the utlrp.sql script. 2. Exclude Statistics Stale or corrupt optimizer statistics in the source