错误代码：Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
1、确认自己本地监听服务已经开启
2、确认自己的oracle服务已经全部启动
3、找到自己的oracle安装地址文件 G:\oracle\product\12.2.0\dbhome_1\network\admin
编辑文件 listener.ora
# listener.ora Network Configuration File: G:\oracle\product\12.2.0\dbhome_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = G:\oracle\product\12.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:G:\oracle\product\12.2.0\dbhome_1\bin\oraclr12.dll")
)
(SID_DESC =
(GLOBAL_DBNAME = ORCL)
(ORACLE_HOME = G:\oracle\product\12.2.0\dbhome_1)
(SID_NAME = ORCL)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.102.177)(PORT = 1521))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
)
)
ADR_BASE_LISTENER = G:\oracle\product\12.2.0\dbhome_1\log
DIAG_ADR_ENABLED_<LISTENERNAME> = OFF
增加加粗的代码。
4、重启红色框框两个服务
5、打开sqldeveloper重新连接自己的数据库就可以了
参考：https://liyf155.iteye.com/blog/1538209