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当你第一次在机器上安装MySQL时,mysql数据库中的授权表是这样初始化的:
你可以从本地主机(localhost)上以root连接而不指定口令。root用户拥有所有权限(包括管理权限)
并可做任何事情。(顺便说明,MySQL超级用户与Unix超级用户有相同的名字,他们彼此毫无关系。)
匿名访问被授予用户可从本地连接名为test和任何名字以test_开始的数据库。匿名用户可对数据库做任
何事情,但无管理权限。
从本地主机多服务器的连接是允许的,不管连接的用户使用一个localhost主机名或真实主机名。如:
% mysql -h localhost test
% mysql -h pit.snake.net test
你以root连接MySQL甚至不指定口令的事实只是意味着初始安装不安全,所以作为管理员的你首先要做的
应该是设置root口令,然后根据你设置口令使用的方法,你也可以告诉服务器重载授权表是它知道这个改
变。(在服务器启动时,它重载表到内存中而可能不知道你已经修改了它们。)
对MySQL 3.22和以上版本,你可以用mysqladmin设置口令:
% mysqladmin -u root password yourpassword
对于MySQL的任何版本,你可以用mysql程序并直接修改mysql数据库中的user授权表:
% mysql -u root mysql
mysql>UPDATE user SET password=PASSWORD("yourpassword") WHERE User="root";
如果你有MySQL的老版本,使用mysql和UPDATE。
在你设置完口令后,通过运行下列命令检查你是否需要告诉服务器重载授权表:
% mysqladmin -u root status
如果服务器仍然让你以root而不指定口令而连接服务器,重载授权表:
% mysqladmin -u root reload
在你设置了root的口令后(并且如果需要重载了授权表),你将需要在任何时候以root连接服务器时指定
下面是我整理的一些方法
首先让mysql以普通用户权限运行mysql。类似sqlserver的设置方法,如果不会的朋友可以使用工具实现。
1.设置或修改Mysql root密码:
默认安装后空密码,以mysqladmin命令设置密码:
登陆mysql:
mysqladmin -uroot password "password";
Mysql命令设置密码:
mysql> set password for root@localhost=password('password);
更改密码:
update mysql.user set password=password('password') where user='root';
flush privileges;
2.删除默认的数据库和用户
drop database test;
use mysql;
delete from db;
delete from user where not(host="localhost" and user="root");
flush privileges;
3. 更改默认root账号名称:
update mysql.user set user="admin" where user="root";
flush privileges;
4. 本地文件安全:
set-variable=local-infile=0
5. 禁止远程连接mysql,远程管理可通过phpmyadmin,编辑my.cnf在[mysqld]添加:
skip-networking
6.最小权限用户:
create database db1;
grant select,insert,update,delete,create,drop privileges on database.* to user@localhost identified by 'passwd';
7. 限制普通用户浏览其它数据库,编辑my.cnf在[mysqld]添加:
--skip-show-database8
.快速修复MySQL数据库
修复数据库
mysqlcheck -A -o -r -p修复指定的数据库
mysqlcheck -o -r database -p
9.跟据内存的大小选择MySQL的配置文件:
my-small.cnf # > my-medium.cnf # 32M - 64M
my-large.cnf # memory = 512M
my-huge.cnf # 1G-2G
my-innodb-heavy-4G.cnf # 4GB

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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