ORA-12514 TNS 监听程序当前无法识别连接描述符中请求服务

今天下午使用plsql连接Oracle数据库时出现了ORA-12514错误，搜索解决方法对listener.ora文件进行了修改:`

`SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = E:\Oracle10g)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = ORCL)
(ORACLE_HOME = E:\Oracle10g)
(SID_NAME = ORCL)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = onest)(PORT = 1521))
)
)``
增加了加粗部分，重启Oracle就好了。
参考链接