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

The most common scenario for this error is migrating data between different Oracle versions (e.g., 11g to 19c) or between different operating systems (e.g., Windows to Linux). The metadata prepared in the source environment might not be compatible with the target's internal processing rules. 2. Including System Schemas

SELECT file_name, status FROM dba_temp_files;

Ensure the database has a functioning default temporary tablespace with datafiles attached. tablespace_name dba_temp_files; Use code with caution. Copied to clipboard Exclude Statistics during Import:

Prevention is better than cure. Implement the following strategies to minimize the risk of encountering this error in Data Pump jobs:

If the issue is caused by a corrupt Data Pump catalog, you can re-register the components by running the dpload.sql script as a SYSDBA user: The most common scenario for this error is

ALTER SYSTEM SET PGA_AGGREGATE_TARGET=2G SCOPE=BOTH;

If internal corruption is suspected, reload the Data Pump metadata objects. For 12c and higher: @?/rdbms/admin/dpload.sql (for CDB/PDB environments, ensure PDBs are open). For older versions (10g/11g): @?/rdbms/admin/catdp.sql @?/rdbms/admin/catmetx.sql Check for Invalid Objects: Ensure all objects are valid. owner, object_name, object_type dba_objects Use code with caution. Copied to clipboard Recompile any invalid objects using the @?/rdbms/admin/utlrp.sql Verify Temporary Tablespace:

The KUPW$WORKER process is the core engine of Oracle Data Pump, responsible for orchestrating the export and import of database objects. When the worker dies from an unhandled exception, Oracle raises this error. While the main job may continue, any objects being processed by the failed worker will be incomplete or skipped altogether. Pinpointing the root cause is critical, as the error itself is a generic symptom of a variety of underlying problems.

[IMPDP Client] │ ▼ [Master Process (DM00)] ────► Coordinates the job │ ▼ [Worker Process (DW00)] ────► Executes PREPARE_DATA_IMP [71] ──► [CRASH] Implement the following strategies to minimize the risk

SELECT comp_id, comp_name, version, status FROM dba_registry; SELECT owner, object_name, object_type, status FROM dba_objects WHERE status = 'INVALID' AND object_name IN ('DBMS_METADATA', 'KUPW$WORKER'); Use code with caution.

exec dbms_stats.gather_dictionary_stats; exec dbms_stats.gather_fixed_objects_stats; Use code with caution. Copied to clipboard 3. Targeted Exclusion

ORA-06502: PL/SQL: numeric or value error (Indicates a variable size overflow).

SELECT owner, object_type, status FROM dba_objects WHERE object_name='DBMS_METADATA'; Use code with caution. status FROM dba_objects WHERE object_name='DBMS_METADATA'

Search the Data Pump log file for lines immediately before ORA-39126 . Typical precursors:

EXEC DBMS_STATS.GATHER_DICTIONARY_STATS; EXEC DBMS_STATS.GATHER_FIXED_OBJECTS_STATS; Use code with caution. Copied to clipboard Rebuild Data Pump Utility:

What (e.g., tables, views, synonyms) was the import utility processing when it crashed? Share public link