TNSNAME配置

Oracle所有的TNS配置文件都存放在：
windows: %ORACLE_HOME%/network/admin/TNSNAME.ORA

orcl = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1421)) ) (CONNECT_DATA = (SERVICE_NAME = mayp) (SERVER = DEDICATED) ) )

orcl 是你远程数据库服务器在你本机的别名，可以随便填写.
HOST = 127.0.0.1 是远程数据库地址
PORT = 1421 是远程数据库服务器端口
SERVICE_NAME = 是远程数据库实例名