数据库监听无法监测Oracle实例服务
发现本地本地监听字符串被修改
SQL> show parameter listener NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ forward_listener string listener_networks string local_listener string -oraagent-dummy- remote_listener string fwoadb-scan:1521
通过修改本地监听字符串。监听恢复正常
SQL> alter system set local_listener=‘(ADDRESS=(PROTOCOL=TCP)(HOST=10.3.19.71)(PORT=1521))‘;
System altered.
SQL>
原文：https://www.cnblogs.com/hanglinux/p/15209904.html