How to check the status of Oracle in Linux?

There are several ways to check the status of an Oracle database.

1. Connect to the Oracle database using the SQL*Plus command line tool, and execute the following SQL statement to view the database status.

SELECT * FROM V$INSTANCE;

This SQL statement will retrieve information about the database instance, including the name, version, and status of the database.

1. Use the Enterprise Manager tool provided by Oracle to check the status of the database. Enterprise Manager is a set of management tools provided by Oracle that can be used to monitor and administer Oracle databases.
2. Check the status of an Oracle database using command-line tools in a Linux system. Use the following command to see if the Oracle database listener is running:

lsnrctl status

This command will return the status information of the listener, including its name, port, and status.

Additionally, you can also use the following command to check if the Oracle database instance is running:

ps -ef | grep ora_

This command will return all process information containing the keyword “ora_”, allowing you to verify if an Oracle database instance is running.