How to connect to an Oracle database from scratch?
To connect to an Oracle database, you need to follow the steps below:
- To install the Oracle database software, you first need to download the version suitable for your operating system from the official Oracle website.
- Create a database instance: After installation, you will need to create a database instance. This is an independent copy of an Oracle database running on your computer.
- Start the database instance: After creating the database instance, you will need to start it. You can use the command line tools or the graphical interface tools provided by the Oracle database software to start the database instance.
- Database user creation: Before connecting to the database, it is necessary to create one or more database users. These users are identities used to access and manage the database.
- Connecting to the database: Once the database instance is started and the database user is created, you can use client tools provided by Oracle (such as SQL*Plus, SQL Developer, etc.) to connect to the database.
- To connect using SQL*Plus, open a command line tool (such as Command Prompt in Windows or Terminal in Linux) and type the following command:
sqlplus username/password@databaseWhere username is the username of the database user you created before, password is the password, and database is the name of your database instance.
- To connect using SQL Developer:
Download and install the Oracle SQL Developer tool, open it and enter the following information to connect to the database:Connection Name: Name of the connection (can be customized)
Username: Username of the database user
Password: Password
Hostname: The hostname or IP address of the database instance
Port: The port number of the database instance
Service Name: The service name of the database (can be specified when the database instance is started)
After successfully connecting, you will be able to execute SQL queries and other database operations in SQL*Plus or SQL Developer.
