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

impdp ... EXCLUDE=VIEW,EXCLUDE=PROCACT_INSTANCE

The error is a generic "catch-all" internal error during an Oracle Data Pump import ( impdp ). It typically signifies an unhandled exception triggered by corrupted metadata, invalid system objects, or specific version incompatibilities . Common Root Causes

The ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is a classic example of an Oracle internal error that surfaces due to underlying environmental issues, bugs, or data corruption. It is not a death sentence for your database but rather a signal that the Data Pump’s internal consistency checks have been tripped.

Based on the analysis above, here is a tiered strategy to resolve the error, ranging from simple workarounds to permanent fixes. Common Root Causes The ORA-39126: Worker unexpected fatal

If you have identified that the error occurs on a specific table or view (e.g., exclude=table:"IN('PROBLEM_TABLE')" ):

SELECT * FROM v$pgastat;

: During an impdp operation, the Data Pump master process creates a snapshot of the metadata to be imported. If there is a mismatch or corruption in the SYS.KU$_xxx master tables (specifically the SYS_IMPORT_SCHEMA_xx tables), the worker process cannot find the data it expects, throwing a "no data found" exception and wrapping it as ORA-39126. If you have identified that the error occurs

: The internal packages or views used by Data Pump may be invalid or corrupted. Missing or Incorrect Tablespaces

One effective workaround is to import only the data itself. If the primary goal is to get the data into the target database without recreating the schema objects, the CONTENT=DATA_ONLY parameter can be used. This bypasses the problematic metadata processing step entirely.

The ORA-39126 error is not a single issue but a symptom of many potential problems. The official Oracle documentation defines it as an internal error, but in practice, the root causes often fall into the following categories: but in practice

The ORA-39126 error during Data Pump import generally indicates a metadata corruption issue or a conflict involving statistics, often manifesting as an ORA-01403 "no data found" error. Common solutions involve excluding statistics ( EXCLUDE=STATISTICS ) during the import or revalidating the Data Pump components using dpload.sql .For further discussion on this error, see the Oracle Support Community .

If the error happens during tablespace mapping, ensure that the schemas you are importing have the necessary quotas on the target tablespaces and that the REMAP_TABLESPACE parameter is used if the source and target tablespace names differ. 4. Summary Checklist Fix corrupted SYS.KUPW$WORKER objects. Use EXCLUDE=STATISTICS Skip corrupted TABLE_STATISTICS objects. Check Data Pump Jobs Drop hung/failed jobs in dba_datapump_jobs . Check Data Version Ensure target version is ≥ source version.

Inspect the Oracle Alert Log ( alert_ .log ) of the target database.

: Corruption within the Data Pump utility or the DBMS_METADATA package can prevent the worker from correctly interpreting the dump file.