监听启动或是停止时提示如下错误：

TNS-12542: TNS:address already in use

TNS-12560: TNS:protocol adapter error

TNS-00512: Address already in use

Linux Error: 98: Address already in use

Listener failed to start. See the error message(s) above...

[oracle@rusky admin]$ netstat -anp | grep 1521  --查看哪些程序正在占用该端口

(Not all processes could be identified, non-owned process info

will not be shown, you would have to be root to see it all.)

tcp 0 0 192.168.1.123:1521 0.0.0.0:* LISTEN 30763/tnslsnr

tcp 0 0 192.168.1.123:19295 192.168.1.123:1521 ESTABLISHED 30961/ora_pmon_bms2

tcp 0 0 192.168.1.123:1521 192.168.1.123:19295 ESTABLISHED 30763/tnslsnr

[oracle@rusky admin]$ kill -9 30763  --kill掉相应的程序

kill -9 30961

kill -9 30763

之后，重新启动监听正常。