Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 |verified| Jun 2026
ALTER TABLESPACE temp ADD TEMPFILE '/new_path/temp02.dbf' SIZE 2G;
Bugs in specific Oracle versions (often fixed in later Patch Sets). Conflicts with "External Tables" or "Virtual Columns."
Outdated statistics on internal dictionary tables or fixed objects can cause Data Pump to fail during its preparation queries. Invalid Objects: Dependent objects like SYS.KUPW$WORKER SYS.DBMS_METADATA might be invalid. Empty Temporary Tablespace:
: If you are using Oracle 12c or higher, this error often occurs in Pluggable Databases (PDBs) where the Data Pump catalog is invalid or incomplete, frequently after a remote clone. ALTER TABLESPACE temp ADD TEMPFILE '/new_path/temp02
: This indicates that an unhandled exception occurred within a Data Pump worker process. It acts as a wrapper for underlying, more specific errors.
Resolving ORA-39126: Worker Unexpected Fatal Error in KUPW$WORKER.PREPARE_DATA_IMP [71]
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 Empty Temporary Tablespace: : If you are using
If you continue to face issues, it is highly recommended to open a Service Request (SR) with Oracle Support, attaching the impdp log file, the trace file created during the error, and the output of select * from v$version .
For Oracle 12c and higher: Connect as SYSDBA and run @$ORACLE_HOME/rdbms/admin/dpload.sql .
The error is occurring in the KUPW_WORKER.PREPARE_DATA_IMP procedure, which is part of the Data Pump worker process. The error code is 71, which is an internal Oracle error code. attaching the impdp log file
Differences in the source and target database versions or character sets.
For a quick data recovery, performing an import with CONTENT=DATA_ONLY will load only the data. The schema objects on the target database must already exist for this to work.
He restarted the import script.
Clear out potential confusion in the optimizer by gathering fresh internal stats: EXEC DBMS_STATS.GATHER_DICTIONARY_STATS; EXEC DBMS_STATS.GATHER_FIXED_OBJECTS_STATS; .
