Service "orcl" has 1 instance(s). Instance "orcl", status READY, has 1 handler(s) for this service... The command completed successfully
后来我本机变更了 IP 地址和主机名，已改 hosts 表。通过 netmgr 这个工具修改了监听信息，发现实例无法启动，lsnrctl status 显示 The listener supports no services，接着参考网上帖子，手动修改了 listener.ora ，实例可以启动了，但状态变成了 UNKNOWN，lsnrctl status 如下：
Service "orcl" has 1 instance(s). Instance "orcl", status UNKNOWN, has 1 handler(s) for this service... The command completed successfully
继续参考别的帖子，尝试了强制注册，手动注册等等方法，lsnrctl status 最终变成了如下：
Service "orcl" has 2 instance(s). Instance "orcl", status UNKNOWN, has 1 handler(s) for this service... Instance "orcl", status READY, has 1 handler(s) for this service... The command completed successfully