oracle listening settings

Listening in Oracle database is an important component. It is responsible for listening to connection requests from clients, allocating these requests and forwarding them to the database instance. Therefore, when we install the Oracle database, we need to set up a listener for it.

The following will introduce how to set up a listener in the Oracle database.

Step one: Check the current monitoring status

Before setting up monitoring, we need to check the current monitoring status. We can do this using the command line tool lsnrctl. Enter the following command in the terminal or command line:

lsnrctl status

This command will display the current listening status. If you see "Service has started", then there is already a listener running. Otherwise, we need to start the listener first.

Step 2: Start the listener

If there is no currently running listener, we can use the following command to start it:

lsnrctl start

This The command will start a listener and run it on the default port 1521. If you want to change the port number, you can use the port parameter in the startup command.

Step 3: Configure the service for the listener

After starting the listener, we need to configure the service to it so that the listener knows how to handle the connection request.

We can use the following command to add a service to the listener:

lsnrctl add service [-protocol tcp] [-port portnumber] [-redirect redirect_address]

Among them, is the service name we want to add, which must be the same as the database instance name in the application. The -protocol parameter is used to specify the protocol, the default is TCP. The -port parameter is used to specify the port number, which defaults to 1521. The -redirect parameter is used to specify the redirect address.

For example, if we want to add the database with the service name mydb to the listener, we can use the following command:

lsnrctl add service mydb

Step 4: Saving listener settings

After completing the configuration of the listener and service, we need to save these settings to the listener's configuration file so that these settings are automatically loaded the next time the listener is started.

We can use the following command to save the listener settings:

lsnrctl save_config

At this point, we have completed the basic settings of the Oracle database listener.

Summary

The listener of Oracle database is an important component. It is responsible for monitoring connection requests from clients and allocating and forwarding these requests to the database instance. When setting up the listener, we need to first check the current listening status to determine whether the listener needs to be started. After starting the listener, we need to configure the service for it and save these settings to a configuration file so that they are automatically loaded the next time the listener is started. In practical applications, we also need to consider factors such as network environment and security, and make corresponding settings and optimizations.

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