增加dblink

create public database link 名称
  connect to 用户名 identified by 密码
  using '(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = IP地址)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SID)
    )
  )';

11g 区分大小写  账号 密码 加双引号