Oracle中数据库的连接-监听配置文件的介绍

参考网址:http://blog.csdn.net/pan_tian/article/details/7611179

• TNSNAMES.ORA - This file contains a list of service names, which translate into the instances the client can connect to. It (tnsnames.ora) is used on outgoing requests.
• SQLNET.ORA - this file is used to configure Oracle Net on the client. For example, tracing can be turned on.
•  LISTENER.ORA - This file configures the listener on the host (server).

连接示意图:其中需要用到环境变量方面的知识，请参考http://www.cnblogs.com/caroline/archive/2012/06/12/2545778.html