The simpler you keep your client and server configurations, and the closer you adhere to the
default values, the simpler the management of your configuration files will be. The Oracle Net
Manager simplifies your configuration file administration. One word of caution: If you are using
your listener to listen for connections from the Internet through a firewall, be sure that you do not
leave a listener listening on the default port, 1521, because a hole through your firewall can leave
you open to potential remote listener reconfiguration. An unsecured listener using default values
can enable a hacker to obtain database information that could compromise your site.
Starting the Listener Server Process
The listener process is controlled by the Listener Control utility, executed via the lsnrctl command.
The options available for the lsnrctl command are described in the next section. To start the listener,
use this command:
lsnrctl start
This command will start the default listener (named LISTENER). If you wish to start a listener
with a different name, include that listener??™s name as the second parameter in the lsnrctl command.
For example, if you created a listener called MY_LSNR, you could start it via the following
command:
lsnrctl start my_lsnr
In the next section you will find descriptions of the other parameters available for the Listener
Control utility.
After starting a listener, you can check that it is running by using the status option of the
Listener Control utility.
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