常用的MySQL操作维护命令
常用的MySQL操作维护命令 1.更改口令: mysqladmin -u root -p password 新的口令 再输入老的口令 2.导出整个数据库: mysqldump -u 用户名 -p 数据库名 导出的文件名 3.导入数据库: 进入mysql数据库控制台, 如mysql -u root -p mysqluse 数据库名 mysqlso
常用的MySQL操作维护命令
1.更改口令:
mysqladmin -u root -p password 新的口令
再输入老的口令
2.导出整个数据库:
mysqldump -u 用户名 -p 数据库名 > 导出的文件名
3.导入数据库:
进入mysql数据库控制台,
如mysql -u root -p
mysql>use 数据库名
mysql>source d:test.sql
4.修复数据库:
a.修复单个库:
mysqlcheck -r -o -u root 数据库名 -p 密码
如:mysqlcheck -r -o -u root sq_test -p (root的密码)
b.修复所有库:
mysqlcheck -A -r -o -u root -p
再输入root口令
c.修复某个库里的表:
myisamchk -r -q 数据库路径 (-r -q意味着“快速恢复模式”)。
如:myisamchk -r -q /data/sq_test/*.MYI
5. 创建一个数据库及其用户
mysql4
Create DataBase 数据库名;
GRANT Select, Insert, Update, Delete, Create, Drop, INDEX, Alter ON 数据库名.* to 登录名@"%" identified by "密码";
mysql5
Create DataBase 数据库名;
GRANT Create VIEW, SHOW VIEW, Create ROUTINE, Alter ROUTINE, EXECUTE,Select, Insert, Update, Delete, Create, Drop, INDEX, Alter ON 数据库名.* to 登录名@"%" identified by "密码";
6. Innodb库转换到MyISAM库
a. 将innodb通过mysqldump 用root备份出来。
b. 用EmEditor(可能部分编码无法识别造成编码丢失,在导入到时候就会报语法错误,最好是使用UE) ,打开备份得到的文件。
用搜索-替换 功能,查找 ENGINE=InnoDB 替换为 TYPE=MyISAM 保存文件。
c. 备份使用innodb引擎的原始文件目录到其他地方,然后删除里面的所有表,以便失败后恢复。
d. 重新导入数据库。
7.关于MYSQL数据库的恢复问题:
a.如果客户使用的是DISCUZ或者PHPWIND论坛程序,无论数据库使用的是哪个版本,是MYSQL4.X还是MYSQL5.X,都可以利用论坛自带的数据库恢复工具恢复回去,不需要去考虑数据库的迁移。请记住这个可以节约很多很的时间和精力。
b.mysqldump -u 用户名 --compatible=mysql40 -p 数据库名 > 导出的文件名
c.关于MYSQL数据库导入失败的问题,修改数据库文件ENGINE=MyISAM DEFAULT CHARSET=gbk为TYPE=MyISAM,然后在导入。
,
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

AI Hentai Generator
Generate AI Hentai for free.

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

Big data structure processing skills: Chunking: Break down the data set and process it in chunks to reduce memory consumption. Generator: Generate data items one by one without loading the entire data set, suitable for unlimited data sets. Streaming: Read files or query results line by line, suitable for large files or remote data. External storage: For very large data sets, store the data in a database or NoSQL.

MySQL query performance can be optimized by building indexes that reduce lookup time from linear complexity to logarithmic complexity. Use PreparedStatements to prevent SQL injection and improve query performance. Limit query results and reduce the amount of data processed by the server. Optimize join queries, including using appropriate join types, creating indexes, and considering using subqueries. Analyze queries to identify bottlenecks; use caching to reduce database load; optimize PHP code to minimize overhead.

Backing up and restoring a MySQL database in PHP can be achieved by following these steps: Back up the database: Use the mysqldump command to dump the database into a SQL file. Restore database: Use the mysql command to restore the database from SQL files.

How to insert data into MySQL table? Connect to the database: Use mysqli to establish a connection to the database. Prepare the SQL query: Write an INSERT statement to specify the columns and values to be inserted. Execute query: Use the query() method to execute the insertion query. If successful, a confirmation message will be output.

One of the major changes introduced in MySQL 8.4 (the latest LTS release as of 2024) is that the "MySQL Native Password" plugin is no longer enabled by default. Further, MySQL 9.0 removes this plugin completely. This change affects PHP and other app

To use MySQL stored procedures in PHP: Use PDO or the MySQLi extension to connect to a MySQL database. Prepare the statement to call the stored procedure. Execute the stored procedure. Process the result set (if the stored procedure returns results). Close the database connection.

Creating a MySQL table using PHP requires the following steps: Connect to the database. Create the database if it does not exist. Select a database. Create table. Execute the query. Close the connection.

Oracle database and MySQL are both databases based on the relational model, but Oracle is superior in terms of compatibility, scalability, data types and security; while MySQL focuses on speed and flexibility and is more suitable for small to medium-sized data sets. . ① Oracle provides a wide range of data types, ② provides advanced security features, ③ is suitable for enterprise-level applications; ① MySQL supports NoSQL data types, ② has fewer security measures, and ③ is suitable for small to medium-sized applications.
