12c Data Pump Export Fails With ORA-39126: Worker Unexpected Fatal Error In KUPW$WORKER.FETCH_XML_OBJECTS  ORA-1403 and ORA-6512 Errors
Last updated on OCTOBER 11, 2017
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 and later
Information in this document applies to any platform.
On : 220.127.116.11 version, Data Pump Export.
You are attempting to perform an full or schema based export (EXPDP), and shortly after the estimate, the job fails with the following errors:
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS 
ORA-01403: no data found
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 11254
Upgrade to 18.104.22.168 and change of PLSQL_OPTIMIZE_LEVEL from the default setting of 2.
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