Running an Oracle Database: A Step-by-Step Guide


Running an Oracle Database is a fundamental aspect of managing enterprise data systems. Whether you're setting up a new database or restarting an existing one, it's essential to follow the correct procedures to ensure smooth operation. This guide outlines the steps required to run an Oracle Database on CentOS 7.


- A CentOS 7 system with sufficient resources to run Oracle Database.

- Oracle Database software installed on the system.

- Basic familiarity with the Linux command line.

Step 1: Log in to the System

Ensure that you have access to the CentOS 7 system where Oracle Database is installed. Log in with appropriate credentials, either as root or with sudo privileges.

Step 2: Open a Terminal

Once logged in, open a terminal or command prompt. This is where you'll execute commands to interact with Oracle Database.

Step 3: Start the Listener (Optional)

Before starting the database, you may need to start the listener, which listens for incoming connection requests from client applications. Run the following command to start the listener :

lsnrctl start

Verify that the listener has started successfully by running:

lsnrctl status

Step 4: Start the Database

To start the Oracle Database instance, follow these steps:

Using SQL*Plus:

1. Launch SQL*Plus as a user with SYSDBA privileges. Run the following command :

sqlplus / as sysdba

Once logged in, start the database with the following command :


If you need to start the database in mount mode (without opening it), use :

startup mount

Verify the database status by running :

SELECT status FROM v$instance;

The status should be OPEN if the database has started successfully.

Using Enterprise Manager Database Control (Optional):

1. Access Enterprise Manager Database Control through a web browser.

2.Log in as a user with administrative privileges.

3.Locate the database you want to start in the list of available databases.

4. Click the 'Start Database' button or equivalent command.

Step 5: Verify Database Status

Regardless of the method used to start the database, it's crucial to verify its status to ensure it's running correctly. Use SQL*Plus or Enterprise Manager Database Control to check the status and confirm that the database is open and accessible.

Step 6: Perform Post-Startup Tasks (Optional)

After starting the database, you may need to perform additional tasks, such as configuring database parameters, managing users, or starting additional services.

Step 7: Shutdown and Restart (Optional)

To shutdown the database, use the shutdown command in SQL*Plus or equivalent functionality in Enterprise Manager Database Control. You can restart the database using the steps outlined above.

Conclusion: Running an Oracle Database on CentOS 7 involves starting the listener (if necessary) and initiating the database instance using SQL*Plus or Enterprise Manager Database Control. By following the steps outlined in this guide, you can ensure that your Oracle Database is up and running efficiently, ready to handle your organization's data needs.