廢話不多說直接上SQL語句：

create database link linkname 
　　 connect to dbuser identified by dbpassword 
　　 using '(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.122.110)(PORT = 1521))
    )
    (CONNECT_DA

TA =
      (SERVICE_NAME = rac)
    )
  )';

其中  linkname 是資料鏈名稱 ,dbuser 登陸使用者名稱 ,dbpassword 登陸密碼 ,HOST= 資料庫所在ip,PORT =埠（預設是1521）,SERVICE_NAME=資料庫的sid（一般預設是orcl）

獲取資料庫的sid：select instance_name from v$instance

例子： create database link interfaceDb_8_11 　　 connect to interfaceDb identified by 000000 　　 using '(DESCRIPTION =     (ADDRESS_LIST =       (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.8.11)(PORT = 1521))     )     (CONNECT_DATA =       (SERVICE_NAME = orcl)     )   )';