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

Solution C: Recompile Invalid ObjectsEnsure the database is "clean" before attempting the import.

During the preparation phase, Data Pump heavily utilizes the database's default temporary tablespace to handle index mapping, row layout configurations, and sorting. If the temporary tablespace is completely empty, offline, or misconfigured at the global database level, PREPARE_DATA_IMP will crash. 3. Source and Target Schema Definition Mismatches

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

Oracle Bug 27155601, Bug 31145156, and similar internal bugs related to object types, partitioning, or virtual columns are notorious for triggering ORA-39126 at line or block 71. Step-by-Step Troubleshooting Checklist

The solution for the ORA-39126 error depends on the root cause of the issue. Some possible solutions include: Solution C: Recompile Invalid ObjectsEnsure the database is

: In a Multitenant environment, ensure all PDBs are open and run this from the CDB. 2. Refresh Dictionary Statistics

To resolve the ORA-39126 error, follow these troubleshooting steps:

After running this, recompile any remaining invalid objects using the utlrp.sql script. 2. Exclude Statistics

However, for a complete import of both schema and data, a permanent fix is required. According to Oracle, this issue was addressed in Oracle Database 20c and later. For customers on older versions, the solution is to apply the interim patch 29450761 . This patch should be available for various platforms and Oracle versions. Before applying it, it is crucial to check for any conflicting patches using the Oracle MOS Patch Planner Tool (Note 1317012.1) to ensure a clean installation. When you see "prepare-data-imp 71"

ORA-39126: Worker unexpected fatal error in KUPW-WORKER.PREPARE-DATA-IMP [worker_process_id] ORA-XXXXX: Underlying cause

The specific message ending with [71] provides a powerful clue. In the context of the KUPW worker, the numeric code points to the exact point of failure. When you see "prepare-data-imp 71", it indicates that the worker encountered an issue while preparing for the data import, specifically during an attempt to populate a table. This phase is critical for setting up the import environment.

Running the import as SYSDBA rather than a standard user with DATAPUMP_IMP_FULL_DATABASE privileges can lead to unexpected behavior.

Data Pump uses a Master Table to track progress. If this table becomes inconsistent, the worker crashes. Before applying it

Bugs in specific Oracle versions (often fixed in later Patch Sets). Conflicts with "External Tables" or "Virtual Columns."

💡 The ORA-39126 [71] error is almost always a metadata inconsistency. Cleaning up orphaned Data Pump tables and excluding statistics are the highest-probability fixes.

To help me narrow down the specific fix for your environment, could you tell me: What is your (e.g., 19.3)? Are you importing into a schema that already contains data ?

The ORA-39126 error is a generic "wrapper" error in Oracle Data Pump that indicates a worker process has crashed unexpectedly. When paired with the specific internal procedure KUPW$WORKER.PREPARE_DATA_IMP and the error code [71], it typically points to a failure during the metadata loading phase of an import (IMPDP) operation.