while performing an import datapump (impdp) to an Oracle 18c database from 12cR2 database dump…..the following errors were thrown:

ORA-39006: internal error

ORA-39065: unexpected master process exception in DISPATCH

ORA-56935: existing datapump jobs are using a different version of time zone data file

ORA-06512: at “SYS.DBMS_DST”, line 1855

ORA-06512: at “SYS.DBMS_SYS_ERROR”, line 79

ORA-06512: at “SYS.DBMS_DST”, line 1818

ORA-06512: at “SYS.KUPM$MCP”, line 19693

ORA-06512: at “SYS.KUPM$MCP”, line 12495

ORA-06512: at “SYS.KUPM$MCP”, line 11882

ORA-06512: at “SYS.KUPM$MCP”, line 14507

ORA-06512: at “SYS.KUPM$MCP”, line 9794

SOLUTION:

sqlplus / as sysdba

SQL> SELECT PROPERTY_NAME, SUBSTR (property_value, 1, 30) value

FROM   DATABASE_PROPERTIES

WHERE  PROPERTY_NAME LIKE ‘DST_%’

ORDER  BY PROPERTY_NAME;

 

SQL> ALTER SESSION SET EVENTS ‘30090 TRACE NAME CONTEXT FOREVER, LEVEL 32’;

SQL> exec dbms_dst.unload_secondary;

**** Important Remark: make sure DST_UPGRADE_STATE is set to “NONE“….you may need to execute the following multiple times: SQL> exec dbms_dst.unload_secondary;