ORA-39126 and ORA-12838: cannot read/modify an object after modifying it in parallel from Datapump Export
(Doc ID 1558708.1)
Last updated on SEPTEMBER 24, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 11.2]
Information in this document applies to any platform.
***Checked for relevance on 16-Dec-2014***
Performing datapump export and receiving errors:
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS 
ORA-12838: cannot read/modify an object after modifying it in parallel
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 8996
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