ORACLE用DB_LINK连接PG数据库查询时报错：ORA-28500: 连接 ORACLE 到非 Oracle 系统时返回此信息:

ERROR: relation "TABLE_NAME" does not exist;
No query has been executed with that handle {42P01,NativeErr = 1}
ORA-02063: 紧接着 3 lines (起自 DL_PG120)

不过，表名和列名加上"就可以正常查询，这个是哪配置有问题？