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

Mark felt a cold drop of sweat slide down his neck. ORA-39126 wasn’t just a regular error; it was a "worker" error. The internal plumbing of the Oracle Data Pump engine had just burst, and the "71" at the end was a cryptic pointer to a specific failure point in the PL/SQL package.

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

The error occurs during an Oracle Data Pump import operation (using impdp ). It indicates that a worker process encountered a critical, unexpected failure while preparing to load data into a table or partition.

Understanding and Resolving ORA-39126: Worker Unexpected Fatal Error in KUPW$WORKER.PREPARE_DATA_IMP [71] Mark felt a cold drop of sweat slide down his neck

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.

: Keep your Oracle database on the latest Release Update (PSU/RU). The bug described in this article is fixed in later 19c PSUs and 20c+. A regular patching cycle is the most effective prevention.

To help narrow down the exact fix for your environment, let me know: What are the ? After running this, recompile any remaining invalid objects

The rows began to flow again. 95%. 96%.

This error halts the import job or leaves it in a plagued state. It usually stems from a mismatch between the export and import database environments, metadata corruption, or hitting an unmapped Oracle internal bug. Common Root Causes

Here are targeted solutions for common ORA-39126 scenarios. It indicates that a worker process encountered a

The Data Pump worker process had essentially walked into a room that was already full. The tablespace where the temporary import tables were being built had run out of space. Because it couldn't write the data it was preparing, the worker process crashed, triggering the generic ORA-39126 alert.

If you are moving data between different Oracle versions (e.g., 19c to 12c), ensure you used the VERSION parameter during the (EXPDP). If you didn't, try adding it to your import command: VERSION=12.1 (or your target version) Use code with caution. 4. Check for Corrupt Metadata