创建DBlink

create database link calcdb.com

　　connect to bitask identified by viewsonic2010

　　using ' (DESCRIPTION =

   (ADDRESS_LIST =

     (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.123.1)(PORT = 1521))

   )

   (CONNECT_DATA =

     (SERVICE_NAME = pwba)

   )

 ) ';