oracle 11g database tutorial

Oracle 11g is currently one of the most commonly used databases and has a wide range of applications in enterprise applications. This article will introduce you to the installation, configuration and use of Oracle 11g database.

1. Install Oracle 11g database

1. Download the Oracle 11g installation program

Visit Oracle's official website and download the corresponding version of the Oracle 11g database installation program.

2. Run the installation program

Double-click the installation program, select "Install Oracle software" in the Oracle Universal Installer interface, and select "Create and configure a new database".

Then, fill in the name of the database, select the database character set, set the administrator account, etc. according to the prompts to complete the installation wizard.

3. Install database software

After completing the above steps, start installing the database software. According to the installation wizard, select the installation path, installation options and other configuration items. After the installation is completed, the system automatically creates an Oracle 11g database instance for you.

2. Configure Oracle 11g database

1. Create a listener

After creating the Oracle 11g database instance, you need to create a listener program to ensure that the database Can communicate normally with the client. Enter the installation directory of Oracle 11g, execute the "netca.exe" command, and create a listener in the wizard.

2. Modify the listener configuration

After creating the listener, you need to modify the configuration information of the listener to ensure it can work properly. Open the listener's management tool by running the "lsnrctl" command, and then open the "listener.ora" file. In this file, add the name and port number information of the database instance.

3. Modify Oracle database configuration

Open the Oracle database configuration file "init.ora" and modify the database parameters to ensure that the database can work normally. For example, you can modify the memory buffer size, maximum number of connections, log file size, etc.

3. Using Oracle 11g database

1. Database connection

After the Oracle 11g database is installed, you can use the tools provided by the database or write code. Data manipulation. For example, use the SQL Plus command line tool to connect to the database and enter the administrator account information.

2. Create database objects

After the database connection is established, you can start to create database objects, such as creating tables, views, indexes, etc. Enter the corresponding SQL statement and execute it in the Oracle 11g database.

3. Database Query

Oracle database supports standard SQL language and some extended languages. Developers can choose appropriate query syntax according to specific needs. For example, SELECT query statement, JOIN statement, subquery statement, etc.

Summary

Oracle 11g database is one of the most commonly used databases in enterprise applications. This article introduces the installation, configuration and use of Oracle 11g database. Proficiency in these contents can provide strong support for enterprise application development.

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