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Technical Articles

Database

Mysql Tutorial

Are mysql and sql the same

MySQL and SQL are brothers, not twins. SQL is a database query language standard, while MySQL is a relational database management system (RDBMS) that follows the SQL standard. There is the following difference between the two: SQL defines rules for interacting with the database, and MySQL is a concrete implementation of these rules. Standard SQL statements can run on any database system that complies with SQL standards, but may require fine tuning. Functions and syntaxes specific to a specific database system are only applicable to that system, such as the LOAD_FILE() function of MySQL. Learning SQL is essential for operating any database system, while learning MySQL and other specifics

Apr 08, 2025 pm 05:12 PM

mysql oracle sql语句防止sql注入

Can mysql store arrays

MySQL does not support array types in essence, but can save the country through the following methods: JSON array (constrained performance efficiency); multiple fields (poor scalability); and association tables (most flexible and conform to the design idea of relational databases).

Apr 08, 2025 pm 05:09 PM

mysql 解决方法

mysql whether to change table lock table

When MySQL modifys table structure, metadata locks are usually used, which may cause the table to be locked. To reduce the impact of locks, the following measures can be taken: 1. Keep tables available with online DDL; 2. Perform complex modifications in batches; 3. Operate during small or off-peak periods; 4. Use PT-OSC tools to achieve finer control.

Apr 08, 2025 pm 05:06 PM

mysql

Can mysql run on android

MySQL cannot run directly on Android, but it can be implemented indirectly by using the following methods: using the lightweight database SQLite, which is built on the Android system, does not require a separate server, and has a small resource usage, which is very suitable for mobile device applications. Remotely connect to the MySQL server and connect to the MySQL database on the remote server through the network for data reading and writing, but there are disadvantages such as strong network dependencies, security issues and server costs.

Apr 08, 2025 pm 05:03 PM

mysql linux 操作系统电脑

Can mysql and mariadb be installed on the same server?

MySQL and MariaDB can be installed simultaneously on a single server to meet the needs of different projects for specific database versions or features. The following details need to be paid attention to: different port numbers; different data directories; reasonable allocation of resources; monitoring version compatibility.

Apr 08, 2025 pm 05:00 PM

mysql 操作系统数据丢失

Unable to access mysql from terminal

Unable to access MySQL from the terminal may be due to: MySQL service not running; connection command error; insufficient permissions; firewall blocks connection; MySQL configuration file error.

Apr 08, 2025 pm 04:57 PM

mysql linux windows 操作系统 mysql连接

Unable to log in to mysql as root

The main reasons why you cannot log in to MySQL as root are permission problems, configuration file errors, password inconsistent, socket file problems, or firewall interception. The solution includes: check whether the bind-address parameter in the configuration file is configured correctly. Check whether the root user permissions have been modified or deleted and reset. Verify that the password is accurate, including case and special characters. Check socket file permission settings and paths. Check that the firewall blocks connections to the MySQL server.

Apr 08, 2025 pm 04:54 PM

mysql linux 操作系统 access 解决方法用户权限管理为什么

Can mysql be used for commercial purposes

MySQL can be used for commercial purposes, depending on business size, budget and technical capabilities. The open source MySQL Community Edition is free but has no commercial support, while the paid MySQL Enterprise Edition offers comprehensive technical support and advanced features. Additionally, commercial use should consider factors such as high availability, high performance, and disaster recovery, and may require advanced technologies such as cluster deployment and read-write separation.

Apr 08, 2025 pm 04:51 PM

mysql sql语句

Can mysql be downloaded on mac

Installing MySQL on a Mac is easy, you can use Homebrew or download the installation package from the official website. After installation, you need to start the service and set the root password. MySQL is a relational database management system that stores and organizes data. Common problems include password errors and connection failures, and debugging methods are by checking passwords, network connections, and SQL syntax. Performance optimization is key, involving index optimization, query optimization and database design. Proficiency in MySQL takes time and practice.

Apr 08, 2025 pm 04:48 PM

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Can mysql be distributed

MySQL can be distributed, but the implementation depends on the requirements. The basic solutions include master-slave replication (to implement read and write separation), MySQL Group Replication (multi-master replication), middleware agent (load balancing), and library and tables (to handle super-large data). Performance, cost, and complexity should be considered when choosing a solution. The distribution plan involves replication delay, data consistency and other issues, and needs to be optimized and debugged according to actual conditions.

Apr 08, 2025 pm 04:45 PM

mysql

Can mysql be used offline

MySQL cannot be used completely offline, but can partially implement offline functions: when data import is completed and no interaction with the outside world is required, MySQL can perform query and update operations as a local file system. At this point, you need to configure the MySQL configuration file and disable all network-related options, such as skip-networking, to prevent MySQL from trying to connect to an external network. However, this partially offline approach limits the functionality of MySQL, such as the inability to manage and maintain using replication or online tools.

Apr 08, 2025 pm 04:42 PM

mysql

Can mysql be sharded

MySQL supports sharding, but requires careful selection of solutions to avoid increasing complexity. Sharding involves horizontal sharding (divided by row) and vertical sharding (divided by column), and good sharding keys and planned data distribution must be designed. The methods to implement sharding include client proxy and middleware-based. The former has high code coupling and good performance, while the latter has strong scalability and complexity. Sharding cannot improve the performance of a single library, and still need to pay attention to index and cache optimization. Before choosing a sharding plan, you need to weigh the pros and cons, consider the complexity and maintenance costs, and avoid blindly following the trend.

Apr 08, 2025 pm 04:39 PM

mysql python

Which is better, MySQL or SQLite?

Database management systems (DBMS) are mainly divided into two categories: relational and non-relational. This article will focus on relational databases and compare two popular options: MySQL and SQLite. MySQL: The powerful open source database MySQL is a relational database management system (RDBMS) developed by Michael Widenus. Originally developed by SunMicrosystems, it was acquired by Oracle in 2009 and became part of its product line. In order to maintain its open source and free features and to cope with Oracle's commercialization strategy, the community has derived alternatives such as MariaDB. Therefore, MySQL still maintains its open source free

Apr 08, 2025 pm 04:36 PM

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Avoid the trap of duplicate indexes in MySQL

MySQL index is the cornerstone of database performance optimization and can significantly improve data retrieval speed and efficiency. However, duplicate indexing may backfire, resulting in waste of resources and degrading query performance. This article is intended to provide practical guides to help you understand and avoid the pitfalls of duplicate indexing. The harm of duplicate indexes Repeated indexes bring a series of problems: Waste of storage space: Each redundant index takes up valuable disk space, which is particularly worrying for large databases. Query efficiency decreases: MySQL query optimizer may experience difficulties when selecting the best index, which affects query performance. Increased replication latency: The transmission of duplicate data between nodes will prolong replication time. Reduced backup efficiency: Larger backup files will lead to longer backup and recovery times, increasing

Apr 08, 2025 pm 04:33 PM

mysql 为什么