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

If the error persists, a more systematic approach is necessary. The first step is to examine the Data Pump log file. But for deeper insight, you need to look at the detailed trace files.

Check DBA_RESUMABLE to see if the worker is actually stuck on a space issue rather than a logic error.

When this error occurs, it is usually accompanied by a stack trace in the Oracle alert log or the import log file:

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 the error persists, a more systematic approach

For Oracle 12c and higher: Connect as SYSDBA and run @$ORACLE_HOME/rdbms/admin/dpload.sql .

: This indicates that an unhandled exception occurred within a Data Pump worker process. It acts as a wrapper for underlying, more specific errors.

SELECT file_name, status FROM dba_temp_files; Check DBA_RESUMABLE to see if the worker is

Resolving ORA-39126 requires moving beyond a simple retry. The DBA must adopt a forensic approach:

If the issue is in metadata preparation, try importing only the data ( CONTENT=DATA_ONLY ) after manually creating the schema objects, or vice versa, to isolate whether the issue is data-related or metadata-related. Step 4: Validate the Dumpfile

The key component is KUPW$WORKER , which is the PL/SQL package responsible for managing worker processes in Data Pump. The tag is a specific code indicating where in the PREPARE_DATA_IMP procedure the failure occurred, often associated with unexpected data types, large LOB segments, or mismatched metadata during object creation. 2. Common Causes Because it couldn't write the data it was

The data preparation phase often trips over non-essential metadata like statistics, indexes, or materialized view logs. Try excluding them to let the core data load finish:

To find out exactly why your worker process is failing, follow this systematic diagnostic path: 1. Analyze the Contextual Error Stack

exec dbms_stats.gather_dictionary_stats; exec dbms_stats.gather_fixed_objects_stats; Use code with caution. Copied to clipboard 3. Targeted Exclusion