Oracle数据库监听服务无法启动

（1） 安装好Oracle后，启动Net Manager，测试orcl失败，报错“ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务”，需要修改监听文件。
修改前：

# listener.ora Network Configuration File: D:\Soft\oracle10g\listener.ora# Generated by Oracle configuration tools. SID_LIST_LISTENER =(SID_LIST =(SID_DESC =(SID_NAME = CLRExtProc)(ORACLE_HOME = D:\Oracle11g\product\11.2.0\dbhome_1)(PROGRAM = extproc)(ENVS = "EXTPROC_DLLS=ONLY:D:\Oracle11g\product\11.2.0\dbhome_1\bin\oraclr11.dll"))) LISTENER =(DESCRIPTION_LIST =(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.12.31)(PORT = 1521)))) ADR_BASE_LISTENER = D:\Oracle11g 修改后：# listener.ora Network Configuration File: D:\Soft\oracle10g\listener.ora# Generated by Oracle configuration tools. SID_LIST_LISTENER =(SID_LIST =(SID_DESC =(SID_NAME = CLRExtProc)(ORACLE_HOME = D:\app\Administrator\product\11.2.0\dbhome_1)(PROGRAM = extproc))(SID_DESC =(GLOBAL_DBNAME = ORCL)(ORACLE_HOME = D:\app\Administrator\product\11.2.0\dbhome_1)(SID_NAME = ORCL))) LISTENER =(DESCRIPTION_LIST =(DESCRIPTION =(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)))(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.12.31)(PORT = 1521)))) ADR_BASE_LISTENER = D:\app\Administrator 这样修改之后貌似都没问题了。（2）C#连接不上Oracle 9i数据库（连接Oracle11g没问题。）
    问题描述：用PLSQL Developer可以登录，客户端不能登录，报错“ORA-12154:TNS:无法处理服务名” ,解决方法：