How to enable oracle monitoring

How to enable the listener in Oracle? Check the listener status If the listener is not started, start it using lsnrctl start Verify that the listener has started successfully

How to turn on listening in Oracle Device

Opening the Oracle listener is an important step in the database startup process. Listeners monitor incoming connection requests and forward them to the relevant database instance. Here are the steps on how to turn on a listener in Oracle:

1. Check the listener status

First, check if the listener is running using the following command:

<code>lsnrctl status</code>

If the listener is started, you will see output similar to the following:

<code>LSNRCTL for Linux: Version 19.3.0.0.0 - Production on 19-AUG-2022 17:43:44
Copyright (c) 1991, 2022, Oracle.  All rights reserved.

STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 19.3.0.0.0 - Production
Start Date                19-AUG-2022 17:43:44
Uptime                  0 days 0 hr. 0 min. 0 sec
Trace Level              off
Security                  ON: Local OS Authentication
SNMP                      OFF</code>

2. Start the listener

If the listener is not started, It can be started using the following command:

<code>lsnrctl start</code>

3. Verify the listener status

Again use the following command to verify that the listener has been started:

<code>lsnrctl status</code>

If the listener started successfully, you will see output similar to the one shown in step 1.

Tip:

• If you encounter an error when starting the listener, please check the listener configuration file (usually located in $ORACLE_HOME/network/ admin/listener.ora).
• After the listener is started, you can use tools such as tnsping to test whether the listener can accept connections.

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