Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 【Confirmed · 2027】

Once the likely cause is identified, several strategies can be employed:

Scenario: Migration from Oracle 12c to 19c. impdp fails with: Once the likely cause is identified, several strategies

ORA-39126: Worker unexpected fatal error in KUPW-WORKER.PREPARE-DATA-IMP [71]
ORA-06550: line 1, column 7: PLS-00201: identifier 'SDO_UTIL.GETNUMELEM' must be declared

Root Cause: The target database lacked Oracle Spatial license or had MDSYS schema invalid objects. Root Cause : The target database lacked Oracle

Solution:

To appreciate the gravity of ORA-39126, one must understand the Data Pump architecture. The KUPW (Data Pump Worker) process handles the actual loading of data into tables. The function PREPARE-DATA-IMP (import data preparation) is responsible for setting up the environment to receive a specific table’s data—evaluating constraints, preparing indexes, and initializing the stream. The number 71 refers to a specific internal subroutine within that preparation phase. To appreciate the gravity of ORA-39126, one must

When the worker encounters a "fatal error" at this stage, it means the process cannot proceed because the metadata or data stream is inconsistent, corrupted, or incompatible with the target database. The worker does not merely throw a warning; it halts the entire import operation.