fedora 12下安装mysql及相关目录介绍_MySQL
Fedora
bitsCN.com fedora 12下安装mysql及相关目录介绍 打开终端,用su用户登陆 输入 Shell代码 yum install mysql mysql-server 等以上两个软件包安装好之后 输入 Shell代码 chkconfig --levels 235 mysqld on /etc/init.d/mysqld start 这样设置系统启动自动启动mysql服务 输入 Shell代码 /etc/init.d/mysqld start 现在就启动mysql服务 为root用户设置一个密码,输入 Shell代码 mysqladmin -u root password 19871015(你的密码) 输入 Shell代码 mysql -u root -p 登录Mysql,然后输入ps进入mysql即可。 相关目录介绍: /var/lib/mysql/ 数据库目录 /usr/share/mysql mysql.server命令及配置文件 /usr/bin mysqladmin mysqldump等命令 /etc/rc.d/init.d 启动脚本文件mysql的目录 部分命令: Shell代码 /usr/bin/mysqladmin -u root 19871015 new-ps //修改登录密码 /etc/init.d/mysqlstart //启动mysql /usr/bin/mysqladmin -u root -pshutdown //停止mysql 自启动设置: Shell代码 /sbin/chkconfig --list //查看mysql是否在自启动列表 /sbin/chkconfig --add mysql //把mysql添加到你的启动服务组中 /sbin/chkconfig --del mysql //把mysql从启动服务中删除 作者 wang_2011_ying bitsCN.com
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In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

MySQL has a free community version and a paid enterprise version. The community version can be used and modified for free, but the support is limited and is suitable for applications with low stability requirements and strong technical capabilities. The Enterprise Edition provides comprehensive commercial support for applications that require a stable, reliable, high-performance database and willing to pay for support. Factors considered when choosing a version include application criticality, budgeting, and technical skills. There is no perfect option, only the most suitable option, and you need to choose carefully according to the specific situation.

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1. Use the correct index to speed up data retrieval by reducing the amount of data scanned select*frommployeeswherelast_name='smith'; if you look up a column of a table multiple times, create an index for that column. If you or your app needs data from multiple columns according to the criteria, create a composite index 2. Avoid select * only those required columns, if you select all unwanted columns, this will only consume more server memory and cause the server to slow down at high load or frequency times For example, your table contains columns such as created_at and updated_at and timestamps, and then avoid selecting * because they do not require inefficient query se

To fill in the MySQL username and password: 1. Determine the username and password; 2. Connect to the database; 3. Use the username and password to execute queries and commands.

MySQL is suitable for beginners because it is simple to install, powerful and easy to manage data. 1. Simple installation and configuration, suitable for a variety of operating systems. 2. Support basic operations such as creating databases and tables, inserting, querying, updating and deleting data. 3. Provide advanced functions such as JOIN operations and subqueries. 4. Performance can be improved through indexing, query optimization and table partitioning. 5. Support backup, recovery and security measures to ensure data security and consistency.

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