oracle usage tutorial

Oracle is a relational database management system that is widely used for data storage, management and processing by major commercial enterprises around the world. Oracle has also become the market leader in database management systems and is widely used in many industries. In this article, we will take an in-depth look at the basic usage tutorials of Oracle.

1. What is Oracle

Oracle is a relational database management system. It was created in 1977 and was developed by Larry Ellison, Ed Oates and Bob Miner. Oracle is extremely easy to use and covers all aspects of SQL in terms of functionality. According to statistics from Oracle's official website, Oracle is one of the most popular database solutions in the global market. Oracle database software is developed by Oracle Corporation and is written in several programming languages, including Java, C, and C. It was originally designed and optimized for handling large enterprise-level databases.

2. Oracle installation

1. The first step is to download and install the Oracle software. Oracle software can be downloaded from the official website, and the installation process can be started after downloading the installation program.
2. After starting the installation program, you first need to select the installation type. In the Select Type dialog box, you can choose between Standard Edition or Enterprise Edition, and so on. Once selected, click the "Next" button.
3. Secondly, you need to configure the Oracle directory. You can use the default values ​​directly, or you can choose to create a new directory. Click the "Next" button.
4. Next, select the installation components, that is, the various components of the Oracle software. You can select the components you need and install them in a specific directory. After selecting the component, you can click the "Next" button at this time.
5. Then you need to set the Oracle service name, which is the name of the Oracle database service. The required service name can be entered on this page. Click the "Next" button.
6. At this point, you need to assign a port number to the database. You can use the default value or choose a different port. Click the "Next" button.
7. When installing the next Oracle step is to select the name and password of the Oracle instance and Oracle Administrator account. In this step, make sure that the password for the database administrator account is strong, as it is required to set up your own database and assign permissions.
8. In this step, you need to specify the basic configuration options of the Oracle software and the names of the managed databases and containers. Click the "Next" button.
9. In the last step, you need to set the system environment variables. This will include Oracle's home directory, middleware and other environment options. By default, Oracle will configure user variables, system variables, administrator variables, etc. for us.

3. Basic operations of Oracle

The basic operations of Oracle refer to operations such as viewing, adding, deleting, updating and filtering of the database.

1. View the database

In Oracle, users can view the structure of the database, such as tables, views, stored procedures, etc. Viewing the database structure is also a prerequisite for other operations. In the Oracle database, use the following SQL statement to view the database.

SELECT table_name FROM all_tables;

2. Add data

In Oracle, you can use the INSERT statement to add data.

INSERT INTO table_name (column1, column2, column3, …) VALUES (value1, value2, value3, …);

3. Update data

In Oracle, use the UPDATE statement to update data.

UPDATE table_name SET column1 = value1, column2 = value2, … WHERE condition;

4. Delete data

In Oracle, use the DELETE statement to delete data.

DELETE FROM table_name WHERE condition;

5. Data filtering

In Oracle, use the SELECT statement to filter data. Specifying the table and the semicolon are required components of the SELECT statement, while WHERE is optional. Used to specify filter conditions.

SELECT * FROM table_name WHERE condition;

4. Oracle backup and recovery

In the database system, backup and recovery are very important steps. In Oracle, the following steps can be used to back up the database.

1. Use the expdp command to back up the database to a specific directory:

expdp username/password directory=my_backup_dir dumpfile=my_backup.dmp full=yes;

2. It is recommended to copy the backup file to another safe place, such as another computer or specific storage device.
3. When restoring the database, please use the following steps:
4. Use the impdp command to restore the backup file from the backup location to the original database.

impdp username/password directory=my_backup_dir dumpfile=my_backup.dmp full=yes;

After the restore is complete, the database will now be exactly the same as the backup file.

5. Summary

Oracle is one of the most widely used database management systems in the global market. Its powerful functions and ease of use make it the first choice for commercial enterprises. In this article, the basic operations of Oracle are introduced, including installation, configuration, backup and recovery, and other operations. Proficient in using Oracle can greatly improve the data management efficiency of an enterprise.

The above is the detailed content of oracle usage tutorial. For more information, please follow other related articles on the PHP Chinese website!