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A complete list of commonly used commands for mysql databases 30 most commonly used commands for administrators
A complete list of commonly used commands for mysql databases 30 most commonly used commands for administrators
Jun 04, 2025 pm 06:03 PM
MySQL administrators should master 30 key commands: 1. SHOW DATABASES view all databases; 2. USE SHOW TABLES view tables in the database; 3. DESCRIBE view table structure; 4. INSERT/UPDATE/DELETE operation data; 5. SELECT query data; 6. mysqldump backup and restore database; 7. EXPLAIN analyze query execution plan; 8. CREATE USER/GRANT/REVOKE/DROP USER manage users and permissions; 9. SHOW PROCESSLIST/SHOW ENGINE/ CHECK/REPAIR/OPTIMIZE TABLE Monitors and maintains databases.
In MySQL database management, administrators need to master a series of commonly used commands to efficiently operate and maintain the database. Today, I will share my years of experience as a database administrator, listing the 30 MySQL commands I consider the most practical, and explaining their usage scenarios and considerations in detail.
First, let's talk about why these commands are so important. As a database administrator, we will encounter various tasks in our daily work, from backup and restore data, to optimizing query performance, to user management and permission control, these commands are all powerful tools in our hands. Not only do they help us solve problems quickly, they also give us a better understanding of the internal functioning of the database.
Let's start with some basic commands:
SHOW DATABASES;
This command allows us to see all available databases on the current server. Every time I log in to the MySQL server, I habitually run this command to quickly understand the current environment.
Next is to check the tables in a database:
USE mydatabase; SHOW TABLES;
After switching to the mydatabase database, SHOW TABLES lists all tables in the database. This command is very useful when we need to conduct a comprehensive check of a database.
For viewing table structures, I often use:
DESCRIBE mytable;
This command can display the structure of the table mytable , including field name, data type, whether it can be NULL, etc. As an administrator, I often need to check the table structure to ensure the correctness of the data model.
In terms of data operations, INSERT , UPDATE and DELETE are the commands we have to deal with every day. For example:
INSERT INTO users (username, email) VALUES ('john_doe', 'john@example.com'); UPDATE users SET email = 'newemail@example.com' WHERE username = 'john_doe'; DELETE FROM users WHERE username = 'john_doe';
Use of these commands requires special care, as they directly affect the integrity of the data. When executing the DELETE command, I always use the SELECT statement to confirm the data to be deleted first to avoid misoperation.
When querying data, SELECT statements are our most commonly used tool:
SELECT * FROM users WHERE age > 30;
This query will return all user records older than 30 in the users table. As an administrator, I often need to query data based on various conditions to monitor the usage of the system.
For database backup and recovery, the mysqldump command is indispensable:
mysqldump -u root -p mydatabase > backup.sql mysql -u root -p mydatabase < backup.sql
These two commands are used to back up and restore the database respectively. Regular backups are one of the most important tasks in database management, and I usually set up automated scripts to perform these operations to ensure the security of the data.
In terms of performance optimization, EXPLAIN command can help us analyze the execution plan of the query:
EXPLAIN SELECT * FROM users WHERE age > 30;
Through this command, we can see the execution plan of the query, including the index used, the number of scanned rows and other information. This is very useful for optimizing slow queries.
In terms of user management and permission control, the following commands are essential:
CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password'; GRANT ALL PRIVILEGES ON mydatabase.* TO 'newuser'@'localhost'; REVOKE ALL PRIVILEGES ON mydatabase.* FROM 'newuser'@'localhost'; DROP USER 'newuser'@'localhost';
These commands allow us to create new users, assign permissions, revoke permissions, and delete users. As an administrator, I need to make sure that each user has the appropriate permissions to ensure the security of the database.
Finally, I want to mention the monitoring and maintenance commands of the database:
SHOW PROCESSLIST; SHOW ENGINE INNODB STATUS; CHECK TABLE mytable; REPAIR TABLE mytable; OPTIMIZE TABLE mytable;
These commands can help us monitor the running status of the database, check the integrity of the table, repair corrupted tables, and optimize table performance. As an administrator, I use these commands every day to ensure the healthy operation of the database.
There are several points to pay attention to when using these commands:
- Backup data : Be sure to back up data before performing any operations that may cause data loss.
- Permission management : Rationally allocate user permissions to avoid security issues caused by abuse of permissions.
- Performance monitoring : Regularly monitor the performance of the database and promptly discover and solve problems.
- Error handling : When executing commands, pay attention to catching and handling errors to avoid unexpected situations.
Through these commands and experience sharing, I hope to help everyone better manage MySQL databases. If you have any questions or need further guidance, please feel free to communicate.
The above is the detailed content of A complete list of commonly used commands for mysql databases 30 most commonly used commands for administrators. For more information, please follow other related articles on the PHP Chinese website!
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