How to enable monitoring of oracle database

How to enable Oracle database monitoring

Oracle database monitoring is the portal for communication between the database and the client. The following is how to turn on Oracle listening:

Step 1: Verify the listening status

Use the following command to check whether the listening has been started:

<code>lsnrctl status</code>

If the listening has been started When started, the output will display the monitored status information.

Step 2: Start the listener

If the listener is not started, start it using the following command:

<code>lsnrctl start</code>

This will start the listener so that the client can Connect to the database.

Step 3: Verify that the listener has started

Run the following command again to verify that the listener has started successfully:

<code>lsnrctl status</code>

The output should show that the listener is Started status.

Note:

• Make sure the listener file is configured correctly (usually located at $ORACLE_HOME/network/admin/listener.ora).
• If you have problems starting the listener, check the error log (usually located at $ORACLE_HOME/network/log/listener.log).
• In some cases, you may need to restart the database for the changes to take effect.

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