How to view oracle database

With the rapid development of the Internet, data has become one of the most important assets in enterprises and organizations. For data processing and management needs, Oracle database has become the first choice of many businesses and organizations because it is a powerful and stable solution. However, for those who are just starting to use Oracle databases, viewing and managing the database may feel a little difficult. In this article, we will introduce how to view the Oracle database so that you can better understand and master database management.

1. Using the Oracle client

The Oracle client is a necessary tool to connect to the Oracle database. Most Oracle clients provide viewing and management functions for Oracle databases. Oracle provides several different versions of the client, including:

1. SQL Developer
2. SQL Plus
3. Oracle Enterprise Manager

SQL Developer is a downloadable, visual tool that creates and manages new database connections and executes various SQL queries. SQL Plus is a command line-based tool that is suitable for users who are familiar with the command line interface. Oracle Enterprise Manager is a web-based tool that can be accessed through a browser.

2. Using the command line

In addition to using the Oracle client, you can also use SQL Plus to view the Oracle database through the command line. The following are some commonly used commands:

1. Connect to the database

Enter the following command on the command line to connect to the database:

sqlplus username/password@ database

where username is your Oracle database username, password is your database password, and database is the name of the database you want to connect to.

2. View database version

At the SQL Plus prompt, enter the following SQL statement to display the database version information:

SELECT * FROM v$version ;

3. View database tables

At the SQL Plus prompt, enter the following command to view all tables in the database:

SELECT table_name FROM all_tables ;

4. View table fields

At the SQL Plus prompt, enter the following command to view all fields of a table:

DESCRIBE table_name;

3. Using Oracle SQL Developer

SQL Developer is a comprehensive tool for managing and operating Oracle databases through a graphical user interface (GUI). SQL Developer provides many functions, such as:

1. Create and edit database objects
2. Execute SQL queries
3. View tables and views
4. Database management

Here are the steps on how to use SQL Developer to view an Oracle database:

1. Open SQL Developer and log in to your Oracle database.
2. In the left navigation bar, click the "Connect" button (as shown in the figure below).
3. In the next dialog box, select the database type (Oracle) you want to connect to, host name, port number, service name (or SID), and database user name and password.
4. Click the "Test" button to verify your connection is successful.
5. Click the "Connect" button and wait for the connection to complete.
6. In the left navigation bar, you can select the "Table" and "View" tabs to view and manage database objects.
7. To execute a SQL query, you can right-click in the window and select the "Run" button to execute your SQL query.

Conclusion

Tools such as Oracle client, command line and SQL Developer can help you view and manage Oracle databases. For those who are just starting to work with Oracle databases, these tools may seem a bit complex. But once you're familiar with how to use them, you'll have an easier time managing your database.

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