datalink编写

create database link dw_xnh_LINK
  connect to dw_xnh identified by dw_xnh
  using ‘(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.10.181)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = orcl)
    )
  )‘