创建一个dblink

CREATE database link KHTY127_LINK
CONNECT TO KHTY2012 IDENTIFIED BY KHTY2012
USING '(DESCRIPTION =
    (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.8.127)(PORT = 1521))
    )
    (CONNECT_DATA =
        (SERVICE_NAME = orcl)
    )
)'; 

SELECT a.id FROM que_answer@KHTY127_LINK a; ok