本次实验将配置静态监听到listener L1上，项目SID_LIST_L1为L1的静态监听配置信息：
（2）listener.ora文件编辑好后，使用reload重新读取该配置文件（reload同时也会重新注册动态监听）：
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In addition, the database services, instances, service handlers, and listening endpoints that were dynamically registered with the listener will be unregistered and subsequently registered again.
http://download.oracle.com/docs/cd/A97630_01/network.920/a96581/lsnrctl.htm
）