ORA-12514:TNS:lisntener does not currently know of service requested in connect descriptor
在使用工具连接oracle库的时候出现了异常

根据理解初步估计是服务或者监听器没有启动
于是链接到数据库服务器进行查看 服务都已经开启,重启后链接依旧出现上述问题
使用lsnrctl status 命令后查看监听状态

发现服务实例中没有包含我链接的orcl实例
于是进行启动实例
按照 https://jingyan.baidu.com/article/a3f121e4b40b49fc9052bb94.html
教程启动实例后,到最后一步 发现会报出启动实例错误,out of memory 错误,结果查看电脑硬盘果然被占满,是内存不足导致..于是叫公司运维加了硬盘后重启服务器..
再次查看监听状态

显示orcl实例已经打开 此时可以使用工具连接上..
参考资料:https://jingyan.baidu.com/article/a3f121e4b40b49fc9052bb94.html
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