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

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71]

is a generic internal error in Oracle Data Pump that typically indicates an unhandled exception within a worker process. The specific code

often points to an issue during the initialization phase where the worker is preparing for data import. Oracle Communities Potential Causes Corrupted Data Pump Metadata

: The internal packages or views used by Data Pump may be invalid or corrupted. Missing or Incorrect Tablespaces

: If the default temporary tablespace is missing or empty, Data Pump cannot manage the metadata for the import job. Schema Conflicts : Attempting to import system schemas (like ) along with application data can trigger this fatal error. Privilege Issues : Sometimes granting IMP_FULL_DATABASE

to a non-system user can cause unexpected behavior in certain environments. Bug-related issues

: Specific versions of Oracle have known bugs (e.g., bug 28307854) that cause ORA-39126 when importing package bodies or certain metadata. Oracle Forums Common Solutions and Workarounds To resolve this error, try the following steps in order:

The error ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is an internal exception within the Oracle Data Pump (impdp) utility. It occurs when a worker process encounters an unhandled state while preparing data for import, often leading to a premature job termination. Common Causes ORA-39126: Worker unexpected fatal error in KUPW$WORKER

This specific error is frequently linked to metadata inconsistencies or environment-specific bugs:

Malformed Statistics: Stale or corrupt optimizer statistics in the source dump file can cause the worker to crash during the preparation phase.

Invalid Data Pump Components: If the Data Pump internal packages (like KUPW$WORKER) or the database catalog are invalid or out of sync, workers will fail.

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

System Schema Conflicts: Attempting to import system-related schemas (like SYSMAN) across different Oracle versions (e.g., 11g to 12c) often triggers internal preparation errors. Troubleshooting and Resolution Steps 1. Rebuild Data Pump Metadata

If the issue is caused by a corrupt Data Pump catalog, you can re-register the components by running the dpload.sql script as a SYSDBA user:

-- For Container Databases (CDB), ensure all PDBs are open first ALTER PLUGGABLE DATABASE ALL OPEN; -- Run the script from the rdbms/admin directory @?/rdbms/admin/dpload.sql Use code with caution. The Fix Arthur checked the disk usage

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

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71]

is a generic "unhandled exception" within the Data Pump worker process, typically occurring during the initial setup of an import job. While the code

identifies the specific internal routine failing, this error often stems from environment mismatches or corrupted Data Pump metadata. Potential Causes Permissions & Sessions : Running Data Pump as

can trigger unexpected behavior or performance issues; it is recommended to use a user with the DATAPUMP_IMP_FULL_DATABASE role instead. Metadata Corruption : The Data Pump packages or required views (like SYS.DBMS_METADATA ) might be invalid or missing. Version Mismatch

: Using a newer export version to import into an older database version without setting the parameter correctly. Resource Issues

: An empty or improperly configured default temporary tablespace can cause the worker process to fail during initial work item dispatch. Recommended Solutions He waited

The ORA-39126 error in KUPW$WORKER.PREPARE_DATA_IMP [71] indicates an internal Data Pump failure during import, often caused by corrupted Data Pump catalogs, PDB/CDB mismatches, or issues within the temporary tablespace. Resolving the issue typically involves validating the Data Pump catalog, ensuring the temporary tablespace is valid, or using the EXCLUDE=STATISTICS parameter. For a detailed troubleshooting guide, refer to Oracle Communities

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] — oracle-mosc

The Fix

Arthur checked the disk usage. The USERS tablespace was at 99.9% capacity. The migration had simply been too large for the allocated space.

He typed rapidly:

ALTER DATABASE DATAFILE '/u01/app/oracle/oradata/orcl/users01.dbf' RESIZE 10G;

He waited. The database confirmed the resize.

Now came the moment of truth. You can't just "resume" a dead worker. He had to restart the job, but thankfully, Data Pump is smart. Because he had used the REUSE_DUMPFILE parameter and the job had failed, he knew the master table would allow him to restart from a checkpoint if he attached to the job—or, more safely, simply restart the import command to let it reconcile the partial data.

He restarted the import script.

Prevention

2. Data Type Mismatch or Conversion Failure

When importing into a target table with a different definition than the source:

3. Retry with minimal parameters

Exclude statistics, constraints, and indexes temporarily:

impdp user/pwd DIRECTORY=dp_dir DUMPFILE=exp.dmp \
EXCLUDE=STATISTICS,CONSTRAINT,INDEX \
TRANSFORM=SEGMENT_ATTRIBUTES:N \
TABLE_EXISTS_ACTION=TRUNCATE