When I try to start listener use the command as below:
lsnrctl start
It will report ORA-12541 problem. I don't know what I changed to make this problem. But luckily today I found it out the solution:
Open network in Redhat, and in the hosts tab: set the IP address as the IP address of this system.
Mine was wrong before and makes the listener start up failed.
After this, we can use a command to reset the network:
/etc/init.d/network restart
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