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
3. Basic operations of Oracle
The basic operations of Oracle refer to operations such as viewing, adding, deleting, updating and filtering of 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;
In Oracle, you can use the INSERT statement to add data.
INSERT INTO table_name (column1, column2, column3, …) VALUES (value1, value2, value3, …);
In Oracle, use the UPDATE statement to update data.
UPDATE table_name SET column1 = value1, column2 = value2, … WHERE condition;
In Oracle, use the DELETE statement to delete data.
DELETE FROM table_name WHERE condition;
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.
expdp username/password directory=my_backup_dir dumpfile=my_backup.dmp full=yes;
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.
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