在安装ORACLE 11G 过程中由于配置的原因，安装过程中报了如下错误：
按照安装提示执行后面的操作后，打开PL/SQL DEVELOPER 连接数据库时总报ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务!
ORACLE NET MANAGER里面测试，测试服务是否能够成功。结果还是报如上错误
在网上百度了一下这个错误ORA-12514，原来很多人都碰到过这个问题，于是按照别人的处理步骤依依配置了，这个问题解决了，不过还是觉得有必要把这个问题解决的步骤记录下来，一来让自己能跟深刻的体会一下，锻炼一下总结能力，二来可以帮助到以后碰到这个问题的人。
先找到找到listener.ora 文件,实验机器位于：E:appkerryproduct11.2.0dbhome_1NETWORKADMIN 目录下的listener.ora文件。问题都在这个文件上。
该文件初始如下所示：
# listener.ora Network Configuration File: E:appkerryproduct11.2.0dbhome_1networkadminlistener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = E:appkerryproduct11.2.0dbhome_1)
(PROGRAM = extproc) www.2cto.com
(ENVS = "EXTPROC_DLLS=ONLY:E:appkerryproduct11.2.0dbhome_1binoraclr11.dll")
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.20.32.106)(PORT = 1521))
)
)
ADR_BASE_LISTENER = E:appkerry
解决办法：
在
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = E:toolsoracleproduct11.2.0dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:E:toolsoracleproduct11.2.0dbhome_1binoraclr11.dll")
)
后面添加
(SID_DESC =
(GLOBAL_DBNAME = orcl.20.32.106 )
(ORACLE_HOME = E:toolsoracleproduct11.2.0dbhome_1)
(SID_NAME = ORCL)
)
添加后的文件内容：
# listener.ora Network Configuration File: E:appkerryproduct11.2.0dbhome_1networkadminlistener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = E:appkerryproduct11.2.0dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:E:appkerryproduct11.2.0dbhome_1binoraclr11.dll")
)
(SID_DESC =
(GLOBAL_DBNAME = orcl.20.32.106)
(ORACLE_HOME = E:appkerryproduct11.2.0dbhome_1)
(SID_NAME = ORCL) www.2cto.com
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.20.32.106)(PORT = 1521))
)
)
ADR_BASE_LISTENER = E:appkerry
注意SID_NAME对应网络服务命名， GLOBAL_DBNAME对应服务名。配置这些后，然后重新开启服务从新连接，OK，问题迎刃而解！
作者 潇湘隐者
