oracle11.2.0.1导入12.2.0.1报错：
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 1837
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 79
ORA-06512: at "SYS.DBMS_DST", line 1800
ORA-06512: at "SYS.KUPM$MCP", line 19749
ORA-06512: at "SYS.KUPM$MCP", line 12206
ORA-06512: at "SYS.KUPM$MCP", line 11616
ORA-06512: at "SYS.KUPM$MCP", line 14215
ORA-06512: at "SYS.KUPM$MCP", line 9426
ORA-39097: Data Pump job encountered unexpected error -56935
解决方法：
SELECT PROPERTY_NAME, SUBSTR (property_value, 1, 30) value
FROM DATABASE_PROPERTIES
WHERE PROPERTY_NAME LIKE 'DST_%'
ORDER BY PROPERTY_NAME;
ALTER SESSION SET EVENTS '30090 TRACE NAME CONTEXT FOREVER, LEVEL 32';
exec dbms_dst.unload_secondary;
直到DST_UPGRADE_STATE为NONE，问题则解决