ora-12541:tns: 无监听程序解决办法

1.首先找到 Oracle 安装文件 中 listener.ora文件与tnsnames.ora文件； 列如：路径：E:\app\当前系统的账户名\product\11.2.0\dbhome_1\NETWORK\ADMIN

2.打开之后listener.ora 中： 如下示列：

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = E:\app\当前系统的账户名\product\11.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:E:\app\当前系统的账户名\product\11.2.0\dbhome_1\bin\oraclr11.dll")
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 当前计算机名称或者 ip地址也可)(PORT = 1521))
)
)

ADR_BASE_LISTENER = E:\app\当前系统的账户名

3.上边更改之后，打开tnsnames.ora文件 ： 如下示列：

ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)

ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 当前计算机名称或者 ip地址也可)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)

4.保存上面两个文件，则重启下Oracle的监听服务：“OracleOraDb11g_home1TNSListener”这个服务即可。

5.重新连接数据库，即可。