Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 Jun 2026

Troubleshooting ORA-39126: Worker Unexpected Fatal Error in KUPW$WORKER.PREPARE_DATA_IMP [71]

Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] ORA-06512: At SYS.DBMS_SYS_ERROR , line 95 ORA-06512: At SYS.KUPW$WORKER , line 9001 Summary Checklist Fix corrupted SYS

: Attempting a broad import that accidentally encompasses system-protected schemas or administrative schemas (like SYSMAN , XDB , or SYSTEM ) often causes the worker process to crash. Check Data Version Ensure target version is ≥

If the error happens during tablespace mapping, ensure that the schemas you are importing have the necessary quotas on the target tablespaces and that the REMAP_TABLESPACE parameter is used if the source and target tablespace names differ. 4. Summary Checklist Fix corrupted SYS.KUPW$WORKER objects. Use EXCLUDE=STATISTICS Skip corrupted TABLE_STATISTICS objects. Check Data Pump Jobs Drop hung/failed jobs in dba_datapump_jobs . Check Data Version Ensure target version is ≥ source version. line 95 ORA-06512: At SYS.KUPW$WORKER

The log file was messy. The error was followed by a cascade of Java stack traces, looking like digital debris after a car crash. He scrolled past the ORA-39126 to find the root cause buried beneath it.