Check if Oracle Database is Running

There are several ways to check if the Oracle database is running.

1. Open a terminal window and enter “sqlplus / as sysdba” and press enter. If you successfully connect to the database, it will display “Connected to an idle instance,” indicating that the database is already running. If the connection fails, it means the database is not running.
2. By using Oracle Enterprise Manager: access the website of Oracle Enterprise Manager in a web browser, log in, and check the status of the database instance. If the database instance status is displayed as “Open”, it means the database has been started.
3. Using Oracle Services: In Windows operating system, you can determine if the database is started by viewing and managing Oracle services. Open the “Services” management interface, locate services with names starting with “Oracle”, and check if their status is “Running”, which indicates that the database is already started.
4. To use the Oracle console in Linux or Unix operating systems, you can check the status of a database instance by entering the appropriate command in a terminal window and pressing enter.
5. Set the ORACLE_SID variable to your SID, then enter SQL*Plus in silent mode. Connect as the sysdba user and start up the Oracle database.
6. If the database instance is successfully started, it will display “Database opened,” indicating that the database has been successfully launched.

Any of these methods can be used to check if the Oracle database is running, simply choose one.