文档解释
ORA-23434: master site string not known for object group
Cause: The site name given as an argument to a routine was not already known to the replicated object group.
Action: Execute the dbms_offline_og.begin_instantiation() routine to add a new site to the replicated object group.
Oracle数据库会报 ORA-23434 错误，表示系统无法识别某个对象组的主服务器字符串。
官方解释
ORA-23434: Master site string not known for object group