Home Database Mysql Tutorial MySQL数据库密码恢复笔记

MySQL数据库密码恢复笔记

Jun 07, 2016 pm 04:16 PM
mysql password recover database notes

前言: 在LINUX下装了MYSQL,刚装完的时候把ROOT空密码改了,当时也改了个好记的密码,没想到过了一个小时就忘记了,于是有了这篇恢复密码过程笔记 因为MySQL密码存储于数据库mysql中的user表中 所以只需要将我windows 2003下的MySQL中的user表拷贝过来覆盖掉

前言:

在LINUX下装了MYSQL,刚装完的时候把ROOT空密码改了,当时也改了个好记的密码,没想到过了一个小时就忘记了,于是有了这篇恢复密码过程笔记

因为MySQL密码存储于数据库mysql中的user表中

所以只需要将我windows 2003下的MySQL中的user表拷贝过来覆盖掉就行了

在c:mysqldatamysql(linux 则一般在/var/lib/mysql/mysql/)目录下有三个user表相关文件user.frm、user.MYD、user.MYI

user.frm //user表样式文件

user.MYD //user表数据文件

user.MYI //user表索引文件

为保险起见,三个都拷贝过来,不过其实如果之前在要恢复的那个MySQL上没有更改过表结构的话,只要拷贝user.MYD就行了

然后

 

#. /etc/rc.d/init.d/mysql stop #. /etc/rc.d/init.d/mysql start #mysql -u root -p XXXXXX

好了,可以用windows 2003下mysql密码登陆了

 

mysql>use mysql mysql>update user set Password=PASSWORD('xxxxxx') where User='root';

这时候会出错,提示user表只有读权限

我分析了一下原因,只这样的,因为user.*文件的权限分配是windows 2003下的,在windows 2003下我ls -l一看权限是666

在linux下我一看,,拷过来后权限变成了600(其实正常情况下600就行了,只不过这里的文件属主不是mysql,拷过来后的属主变为了root,所以会出现权限不够,这时候如果你改成权限666则可以了,当然这样不好,没有解决问题的实质),在/var/lib/mysql/mysql/下ls -l看了一下再

 

#chown -R mysql:mysql user.* #chmod 600 user.*

//OK,DONE

重起一下MYSQL

重新连接

 

mysql>use mysql mysql>update user set Password=PASSWORD('xxxxxx') where User='root'; mysql>FLUSH PRIVILEGES;

有一点值得注意:如果你windows 下mysql如果是默认配置的话,注意要还要执行

 

mysql>delete from user where User=''; mysql>delete from user where Host='%'; mysql>FLUSH PRIVILEGES;

好了,到这里恢复密码过程就完成了

这个方法么就是有点局限性,你必须也具备另外的user表文件

其他还有几种方法

其它方法一(这个是网上流传较广的方法,mysql中文参考手册上的)

1. 向mysqld server 发送kill命令关掉mysqld server(不是 kill -9),存放进程ID的文件通常在MYSQL的数据库所在的目录中。

 

killall -TERM mysqld

你必须是UNIX的root用户或者是你所运行的SERVER上的同等用户,才能执行这个操作。

2. 使用`--skip-grant-tables' 参数来启动 mysqld。 (LINUX下/usr/bin/safe_mysqld --skip-grant-tables , windows下c:mysqlbinmysqld --skip-grant-tables)

3. 然后无密码登录到mysqld server ,

 

>use mysql >update user set password=password("new_pass") where user="root"; >flush privileges;

你也可以这样做:`

 

mysqladmin -h hostname -u user password 'new password''

4. 载入权限表: `

 

mysqladmin -h hostname flush-privileges'

或者使用 SQL 命令`

 

FLUSH PRIVILEGES'

5.

killall -TERM mysqld

6.用新密码登陆

其它方法二

直接用十六进制编辑器编辑user.MYD文件

不过这个里面我要说明一点,我这里编辑的时候发现个问题,加密的密码串有些是连续存储的,有些的最后两位被切开了,后两位存储在后面其他地方.这一点我还没想明白.还有注意一点就是编辑的是加密过的密码串,也就是说你还是需要另外有user表文件。这种方法和我最上面介绍的方法的区别在于,这种方法直接编辑linux下的user表文件,就不需要重新改文件属主和权限了

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

MySQL: An Introduction to the World's Most Popular Database MySQL: An Introduction to the World's Most Popular Database Apr 12, 2025 am 12:18 AM

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.

MySQL's Place: Databases and Programming MySQL's Place: Databases and Programming Apr 13, 2025 am 12:18 AM

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

How to connect to the database of apache How to connect to the database of apache Apr 13, 2025 pm 01:03 PM

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.

Why Use MySQL? Benefits and Advantages Why Use MySQL? Benefits and Advantages Apr 12, 2025 am 12:17 AM

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.

How to start mysql by docker How to start mysql by docker Apr 15, 2025 pm 12:09 PM

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

MySQL's Role: Databases in Web Applications MySQL's Role: Databases in Web Applications Apr 17, 2025 am 12:23 AM

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

Laravel Introduction Example Laravel Introduction Example Apr 18, 2025 pm 12:45 PM

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

How to install mysql in centos7 How to install mysql in centos7 Apr 14, 2025 pm 08:30 PM

The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting

See all articles