如何启动/停止/重启MySQL 一、 启动方式 1、使用 service 启动:service mysql start 2、使用 mysqld 脚本启动:/etc/inint.d/mysql start 3、使用 safe_mysqld 启动:safe_mysql 二、停止 1、使用 service 启动:service mysql stop 2、使用 mysqld 脚本启
如何启动/停止/重启MySQL
一、 启动方式
1、使用 service 启动:service mysql start
2、使用 mysqld 脚本启动:/etc/inint.d/mysql start
3、使用 safe_mysqld 启动:safe_mysql&
二、停止
1、使用 service 启动:service mysql stop
2、使用 mysqld 脚本启动:/etc/inint.d/mysql stop
3、mysqladmin shutdown
三、重启
1、使用 service 启动:service mysql restart
2、使用 mysqld 脚本启动:/etc/inint.d/mysql restart
刚开始学mysql时都是用redhat自带的。启动是什么 /rc.d/init.d/ start
这很简单,但是后来越学越多,系统自带的mysql,有的是版本太低,有的是与
自己想要装的web服务需要的低版本的mysql
后来自己学着以tar的方式安装mysql,我的mysql装在/usr/local/mysql目录下启
动碰到过很多问题。最常见的是:
ERROR 2002: Can’t connect to local MySQL server through socket
‘/tmp/mysql.sock’ (111)
解决办法:
[root@test mysql]# /usr/local/mysql/bin/mysqladmin -u root /
-S /var/lib/mysql/mysql.sock password ‘your.passwd’
或者做个连接
ln -s /var/lib/mysql/mysql.sock /tmp
其实提示找不到 /tmp/mysql.sock有时也并不是/tmp目录下没这个文件,是启动
命令不对,我碰到过
常见的几种启动方式,自己也不是记得很 清楚,如果你确定tmp下有mysql.sock这
个文件不妨试试另外的几个命令
/usr/local/mysql/bin/mysql -u root -p
/usr/local/mysql/bin/mysqld –user=mysql&
/usr/local/mysql/bin/mysqld –user=root&
/usr/local/mysql/bin/mysqld_safe –user=root&
/usr/local/mysql/bin/mysqld_safe –user=mysql&
/usr/local/mysql/bin/safe_mysqld–uer=root&(注意safe_mysqld与mysqld_safe是不同的,&表示mysql在后台运行)我的就会报错了
STOPPING server from pid file
/usr/local/mysql/data/localhost.localdomain.pid
060304 11:46:21 mysqld ended
这是权限问题,我的mysql目录属于root用户,也属于root群组,改用mysqld_safe启动就没问题了,
大家只要注意这几个mysql,safe_mysqld,mysqld_safe,mysqld,mysqladmin.多试
几次
其实有时mysql已经正 常启动了,查看mysql是否启动命令
ps -aux | grep mysqld
会看到如下类似内容
mysql 6394 0.0 1.5 10528 992 pts/3 S 16:16 0:00
/usr/local/mysql/
mysql 6395 0.0 1.5 10528 992 pts/3 S 16:16 0:00
/usr/local/mysql/
mysql 6396 0.0 1.5 10528 992 pts/3 S 16:16 0:00
/usr/local/mysql/
root 6422 0.0 1.1 2408 732 pts/3 S 16:20 0:00 grep
mysql
查看mysql是否在监 听端口命令
netstat -tl | grep mysql
会看到如下类似内容
tcp 0 0 :mysql :* LISTEN

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

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.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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