浅谈MySql的存储引擎(表类型)
通常意义上,数据库也就是数据的集合,具体到计算机上数据库可以是存储器上一些文件的集合或者一些内存数据的集合
这种引擎是mysql最早提供的。这种引擎又可以分为静态MyISAM、动态MyISAM 和压缩MyISAM三种:
这种类型是MyISAM类型的一种变种。合并表是将几个相同的MyISAM表合并为一个虚表。常应用于日志和数据仓库。
3 InnoDB:
4 memory(heap):
5 archive:
当然MySql支持的表类型不止上面几种。
下面我们介绍一下如何查看和设置数据表类型。
1 查看数据库可以支持的存储引擎
用show engines; 命令可以显示当前数据库支持的存储引擎情况,如图1所示:
图1 数据库的存储引擎
由上图可见当前系统的默认数据表类型是MyISAM。当然,我们可以通过修改数据库配置文件中的选项,设定默认表类型。
2 查看表的结构等信息的若干命令
要查看表的定义结构等信息可以使用以下几种命令:
2.1Desc[ribe]
例如,查看表t1的结构,可得下图。
图2:查看表t1的结构
2.2 Show create table tablename; //显示表的创建语句
同上查询表t1,得下图:
图3 显示创建表t1的语句
2.3 show table status like ‘tablename'\G显示表的当前状态值
同上查询表t1,得下图:
图4 显示表t1 的当前状态值
综上可见,后两种方式都可以帮助我们查看某一表的存储引擎类型(图中已用红色方框标出)。
3 设置或修改表的存储引擎
3.1创建数据库表时设置存储存储引擎的基本语法是:
图6 显示表t1 的当前状态值
3.2修改存储引擎,可以用命令Alter table tableName engine =engineName
图7 修改表user的存储引擎
图8 显示表user修改后的状态值

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



You can open phpMyAdmin through the following steps: 1. Log in to the website control panel; 2. Find and click the phpMyAdmin icon; 3. Enter MySQL credentials; 4. Click "Login".

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

Redis uses a single threaded architecture to provide high performance, simplicity, and consistency. It utilizes I/O multiplexing, event loops, non-blocking I/O, and shared memory to improve concurrency, but with limitations of concurrency limitations, single point of failure, and unsuitable for write-intensive workloads.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.

The methods for viewing SQL database errors are: 1. View error messages directly; 2. Use SHOW ERRORS and SHOW WARNINGS commands; 3. Access the error log; 4. Use error codes to find the cause of the error; 5. Check the database connection and query syntax; 6. Use debugging tools.

Effective monitoring of Redis databases is critical to maintaining optimal performance, identifying potential bottlenecks, and ensuring overall system reliability. Redis Exporter Service is a powerful utility designed to monitor Redis databases using Prometheus. This tutorial will guide you through the complete setup and configuration of Redis Exporter Service, ensuring you seamlessly build monitoring solutions. By studying this tutorial, you will achieve fully operational monitoring settings
