oracle installation and use

Oracle is currently the most widely used relational database management system in private enterprises around the world, with powerful and stable data processing and data storage capabilities. Oracle can run on various operating systems such as Windows and Linux, supports multiple programming languages, such as C, C, Java, Python, etc., and provides complete development tools, such as PL/SQL, SQL Developer, etc. This article will introduce the installation and use of Oracle.

1. Oracle installation

1. Download the Oracle installation package

First you need to download it from the Oracle official website (https://www.oracle.com/index.html) or other Download the Oracle software installation package from official channels. After selecting the appropriate version and operating system, download the corresponding software package. It should be noted that Oracle requires a large amount of hard disk space and memory during the installation process. It is recommended to use a high-configuration computer for installation.

2. Install Oracle

After downloading, unzip the installation package and run the setup.exe file to enter the installation interface. Make selections and settings according to the installation prompts, and pay attention to the following points:

(1) Oracle installation requires administrator rights, and you must log in with an administrator account during installation.

(2) The Oracle installation process requires setting the Oracle SID (System Identifier) ​​and password. The SID is the unique identifier of the Oracle database. The user name and password are used to log in to the database.

(3) During the Oracle installation process, you need to set parameters such as the character set, locale, and installation path of the database. These parameter settings affect the use of Oracle database and should be selected according to actual needs.

(4) During the Oracle installation process, you can choose to install Oracle's graphical management tool SQL Developer. After installation, you can easily perform database management and development.

After the installation is completed, you need to start the Oracle service and configure the Oracle listener (Listener). The Oracle service refers to the Oracle process running in the operating system and is used to manage and maintain the database; the Oracle listener is used to process The service requested by the connection between the client and the database server.

3. Using Oracle

1. Start the Oracle service

Find the bin directory in the Oracle installation directory and run the startup.bat file to start the Oracle service. After successful startup, you can use the netstat command to confirm whether the Oracle listener has been started.

2. Log in to Oracle

Use SQL Developer or command line tools to enter the user name and password to log in to the Oracle database. After successful login, you can use SQL statements to perform database operations.

3. Create a database

In Oracle, you can create databases and data tables through SQL statements. For example, create a database named "test".

CREATE DATABASE test;

4. Create data table

In the database, you can create one or more data tables, each data table contains multiple columns and rows , the columns define the attributes of the data, and the rows represent the specific data. In Oracle, you can create a data table through the following SQL statement.

CREATE TABLE employee (
employee_id INT PRIMARY KEY,
employee_name VARCHAR2(50),
employee_age INT,
employee_phone VARCHAR2(20)
);

5. Insert data

After creating the data table, you can insert data into the data table through SQL statements, for example:

INSERT INTO employee VALUES (1, 'Zhang San', 25 , '136xxxxxxxx');
INSERT INTO employee VALUES (2, '李思', 28, '139xxxxxxxx');

6. Query data

You can use SQL statements to query data Data in the table, for example:

SELECT * FROM employee;

7. Update and delete data

You can use SQL statements to update and delete data in the data table, for example ：

UPDATE employee SET employee_name='王五' WHERE employee_id=1;
DELETE FROM employee WHERE employee_id=2;

To sum up, Oracle is a very powerful The relational database management system can quickly develop and manage databases through simple installation and configuration. During use, you need to be familiar with the SQL language and various functions of Oracle in order to better use its capabilities.

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