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

In this article, we will dissect this error, explain the role of the KUPW-WORKER and the PREPARE-DATA-IMP phase, explore the most common causes (including the often-seen "71" sub-code), and provide actionable step-by-step solutions. What is ORA-39126? The full error message usually appears as:

Introduction Oracle Data Pump is the backbone of modern Oracle database migrations, backups, and ETL processes. It is praised for its speed, parallelism, and fine-grained object control. However, when it fails, it often fails cryptically. Among the most dreaded errors encountered by database administrators (DBAs) is: In this article, we will dissect this error,

impdp ... LOGTIME=ALL TRACE=480300 Or, check the Data Pump master table: It is praised for its speed, parallelism, and

This error typically occurs during the phase ( impdp ), specifically when the Data Pump worker process is preparing to load data into a table. The error is a "wrapper" or "umbrella" error—meaning it signals a fatal failure, but the root cause is often hidden in a secondary error stack or requires deep investigation. LOGTIME=ALL TRACE=480300 Or, check the Data Pump master

impdp ... TABLES=SCOTT.DATA_TABLE LOGTIME=ALL TRACE=128000 If the problem relates to storage or segments:

impdp ... ACCESS_METHOD=SEQUENTIAL_FILE If the import succeeds, the issue lies in direct path’s handling of your data. Identify the table that fails (e.g., SCOTT.DATA_TABLE ) and exclude it:

Start by examining the full error stack, isolate the failing table, disable direct path, and incrementally apply transformations. In stubborn cases, rebuilding the dump file or adjusting the target database’s feature set (like Spatial or XML DB) is necessary.