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

When the error is linked to a specific object type, the quickest workaround can be to exclude it from the operation. This is particularly effective for objects like table statistics ( EXCLUDE=STATISTICS ) or problematic Advanced Queuing (AQ) tables. While you may lose some data in the process, you can often recreate or re-import it later, allowing the main job to succeed.

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:

This script recompiles all invalid PL/SQL packages in the database. Re-run your Data Pump job after compilation completes.

Physical corruption of the .dmp file or file system issues can cause the worker to abort when trying to read the data.

For most modern Oracle versions (12c+), the most effective fix is to rebuild the Data Pump utility packages to clear internal corruption. When the error is linked to a specific

General solutions involve checking system resources and making configuration changes.

If the temp file is missing or offline, add a new temp file:

Arthur let out a breath he didn’t know he was holding. It wasn’t corruption. It wasn't a hardware failure. The worker process— KUPW$WORKER —had tried to prepare a chunk of data for import, hit a wall, and threw its hands up in a "fatal error."

Data Pump workers are heavily reliant on Program Global Area (PGA) memory. If the PGA allocation is insufficient or a specific event has limited the heap size, the workers fail. Ensure the database has a functioning default temporary

: If the Data Pump internal packages (like KUPW$WORKER ) are invalid or have become desynchronized, they will fail to process the import stream.

[IMPDP Client] │ ▼ [Master Process (DM00)] ────► Coordinates the job │ ▼ [Worker Process (DW00)] ────► Executes PREPARE_DATA_IMP [71] ──► [CRASH]

: 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.

Attempting to import system-related schemas (such as SYSTEM , SYSMAN , or SYS ) during a user data import can cause severe conflicts in the dictionary data. The import process fails when PREPARE_DATA_IMP cannot reconcile these system objects. 3. Oracle Bug in DBMS_METADATA Re-run your Data Pump job after compilation completes

a Data Pump internal error that typically occurs when the worker process encounters an unhandled exception during the preparation phase of an import . The specific code is often associated with underlying ORA-01403: no data found errors in the internal Data Pump packages. Oracle Communities Likely Causes Data Pump Metadata Corruption:

Internal Data Pump packages or objects may be in an inconsistent state. Stale Dictionary Statistics:

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

impdp ... table_exists_action=truncate

impdp ... transform=lob_storage:no_change