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

When doing a full import, avoid importing system schemas. Use the EXCLUDE parameter to skip these schemas in your impdp command:

Database upgrades, partial patch applications, or system crashes can leave internal dictionary objects or views (such as those prefixed with KU$_ ) in an invalid state. When the worker reads metadata, missing or invalid SYS packages cause an immediate unhandled exception. 3. Structural Constraints and Remapping Clashes When doing a full import, avoid importing system schemas

Then review and manually execute the DDL, adjusting problem columns. PARALLEL=1 # or match CPU cores Sometimes the

impdp ... PARALLEL=1 # or match CPU cores adjusting problem columns. impdp ...

Sometimes the error is isolated to a specific object type that the Data Pump worker cannot process.

The error is a generic internal error in Oracle Data Pump that typically indicates an unhandled exception within the worker process during the data import preparation phase. Root Causes