The database listener process reads the listener.ora and sqlnet.ora files for its configuration; the database administrator (DBA) manages it by using the lsnrctl command-line utility. You can use the utility to do these things to the listener:
There is no direct relationship between the listener process and the database itself; the processes operate independently.
To start the listener, issue the lsnrctl start command:
c:\> lsnrctl start
If you need to stop the listener, you can issue the lsnrctl stop command:
c:\> lsnrctl stop
To determine what databases the listener is configured to service requests, you can read the listener.ora configuration file. Or you can issue the lsrnctl status command:
c:\> lsnrctl status
After changing the listener.ora file, you must restart the listener process. You can do this via the stop and start commands.
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