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

impdp ... transform=lob_storage:no_change

The Oracle Data Pump worker process encountered an unexpected fatal error while preparing data for import. The specific error code is "ora-39126" and the error message indicates that the issue occurred in the KUPW_WORKER.PREPARE_DATA_IMP module.

Understanding ORA-39126 During Data Pump Import The is a generic wrapper error in Oracle Data Pump. It indicates that an internal worker process encountered an unhandled exception and failed. When paired with KUPW$WORKER.PREPARE_DATA_IMP [71] , it pinpoints a specific failure location. The worker process crashed while executing internal code block 71 during the data preparation phase of an import ( impdp ) operation.

Summary

The schema being imported contains invalid spatial indexes, functional indexes, or complex constraints that fail during the "prepare" phase.

Outdated statistics on internal dictionary tables or fixed objects can cause Data Pump to fail during its preparation queries.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:

Most ORA-39126 block 71 errors are known bugs fixed in newer quarterly release updates. Ensure both your source and target environments are patched to the latest RU level. Understanding ORA-39126 During Data Pump Import The is

The internal procedure PREPARE_DATA_IMP prepares the target database objects to receive data rows. The visual tag [71] identifies the precise line or block of code within that internal procedure where the execution encountered an unhandled exception. Root Causes of the Error

ORA-01653: unable to extend table SYSTEM.SYS_EXPORT_TABLE_01 by 1024 in tablespace USERS

Aftermath : Once the import is successful, regenerate statistics manually: The worker process crashed while executing internal code

If you are moving data between different Oracle versions (e.g., 19c to 12c), ensure you used the VERSION parameter during the (EXPDP). If you didn't, try adding it to your import command: VERSION=12.1 (or your target version) Use code with caution. 4. Check for Corrupt Metadata

Short-term remediation steps

Check the Data Pump trace directory for worker trace files ( *dw*.trc ). Look for errors like ORA-01403: no data found , ORA-00942: table or view does not exist , or LPX-00210: expected AS exhibited . Step 2: Verify Database Component Validity If you didn't

Bugs in specific Oracle versions (often fixed in later Patch Sets). Conflicts with "External Tables" or "Virtual Columns."