How to modify oracle monitoring

The listener in Oracle database is an important configuration, which is responsible for listening for requests from the database instance and distributing them to the correct service. If there is a problem with the listener configuration, it may cause the database to malfunction or fail to connect, so for database administrators, modifying the configuration of the Oracle listener is a necessary skill.

This article will introduce how to modify the configuration of the Oracle listener, including the following steps:

1. Confirm the current status of the listener
2. Edit the listener configuration file
3. Restart the listener

1. Confirm the current status of the listener

Before modifying the listener configuration, we need to confirm the current status of the listener to ensure that it can start normally and stop. In Linux systems, you can use the following command to check the status of the listener:

$ lsnrctl status

This command will display the status information of the listener, including the name of the listener, version number, listening address, etc. Make sure the status of the listener is "READY", indicating that the listener is ready to receive connection requests.

2. Edit the listener configuration file

The configuration file of the Oracle listener is "listener.ora", which is usually located in the $ORACLE_HOME/network/admin directory. We can use any text editor to edit this file.

Before editing, we need to back up the file so that it can be restored if there is a problem with the modification. You can use the following command to back up:

$ cp listener.ora listener.ora.bak

After the backup is completed, open the listener.ora file and modify the configuration information as needed. The following are some common configuration parameters and their descriptions:

• LISTENER: The name of the listener, usually LISTENER.
• ADDRESS: The IP address and port number monitored by the listener. Multiple addresses and port numbers can be specified.
• PROTOCOL: The protocol type used, usually TCP.
• SERVICE_NAME: The service name used to connect to the service.

The following is a sample configuration file:

# listener.ora Configuration File
# Generated by Oracle configuration tools.

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = hostname)(PORT = 1521))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = orcl)
      (SID_NAME = orcl)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
    )
  )

In this configuration file, the listener name is LISTENER, the listening address is "hostname:1521", and the protocol used is TCP. The service name of the connection service is "orcl".

3. Restart the listener

After modifying the configuration file, we need to restart the listener to make it take effect. You can use the following command to stop the listener:

$ lsnrctl stop

After the listener stops, use the following command to start the listener:

$ lsnrctl start

After starting, use the following command again to check the listener. Status:

$ lsnrctl status

If the status is "READY", it means the modification is successful.

Summary

Modifying the configuration of the Oracle listener is a necessary skill that can help database administrators better manage the database. Before making modifications, you need to confirm the status of the listener, back up the configuration file, modify the configuration file as needed, and finally restart the listener to make the configuration take effect. Through the above steps, you can quickly and efficiently modify the configuration of the Oracle listener.

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