How to configure the listener in oracle database

Oracle listener allows clients to connect to the database server. Configuration steps include: creating the listener.ora configuration file and specifying the listening address (HOST) and port (PORT). Start the listening program: lsnrctl start. Verify listener status: lsnrctl status. Client connection: Use the format @[database_host]:[port]/[database_name].

How to configure the listener in the Oracle database

The Oracle listener is a software component responsible for managing the client connection to the server. The following are the steps to configure the Oracle listener:

1. Create the listener configuration file

Create the text file listener.ora and place it in the specified or default directory (for example, $ORACLE_HOME/network/admin). The file contents should be as follows:

<code>LISTENER =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
)</code>

• The ADDRESS section specifies the address and port on which the listener listens.
• The PROTOCOL section specifies the network protocol (TCP in this case).
• The HOST section specifies the IP address or host name on which the listener listens. The
• PORT section specifies the port number on which the listener listens.

2. Start the listening program

Use the following command to start the listening program:

<code>lsnrctl start</code>

3. Verify the listening program

Verify that the listener is running using the following command:

<code>lsnrctl status</code>

If the listener is running, you will see information about the listener status and connection.

4. Client connection

The client can connect to the Oracle database by specifying the listener program:

<code>[database_username]/[database_password]@[database_host]:[port]/[database_name]</code>

For example:

<code>scott/tiger@localhost:1521/orcl</code>

Other configuration options

In addition to the basic configuration, the listener has the following other configuration options:

• SID Name: Specify The name of the Oracle instance on which the listener will listen.
• Connection pooling: Enable connection pooling to improve performance.
• Security Configuration: Configure a security protocol (such as SSL) to protect the connection.

See the Oracle documentation for more configuration options.

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