作为一个运维人员,不光是要学会mysql服务的搭建和安装,也要懂得基础命令及语法的使用。 这是我学习之后总结出来的笔记,希望对和我一样的菜鸟有所帮助。 一、登录mysql数据库 1、连接本地mysql数据库,默认端口为3306。 #mysql –u root –p 123456 //-u:指定用户 -p:指定与用户对应的密码。 2、通过IP和端口连接远程mysql服务器。 #mysql –u root –p 123456 –h 192.168.100.1 –P 3306 //-h:指定数据库服务器IP -P:指定要连接的端口号。 3、通过TCP连接管理不同端口的多个MySQL(注意:MySQL4.1以上版本才有此项功能) #mysql -u root –p 123456 --protocol=tcp --host=localhost --port=3307 4、通过socket套接字管理不同端口的多个MySQL #mysql -u root -p --socket=/tmp/mysql3307.sock 5、退出mysql. >exit; 二、数据库操作语句 1、显示所有数据库。 >show databases; 2、创建一个test1234数据库。 >create database test1234; 3、选定test1234数据库。 >use test1234; 4、删除test1234数据库。 >drop database test1234; 三、表操作语句 1、显示当前库中的所有表。 >show tables; 2、在当前库中创建一个user表,字段id为主键、唯一索引,存储引擎为MYISAM。 >create table user (id int(5) unsigned,name char(10) not null, pass char(20) not null,primary key (id)) engine = myisam; 3、查看user表结构。 >describe user; 4、 查询user表中的记录。 >select * from user; 5、在user表中指定条件查询。 >select * from user where name = 'zhangsan' ; 6、查询user表,并按id排序。 >select * from user order by id desc; 7、在user表中指定字段name、pass查询。 >select name,pass from user; 8、在user表中查询唯一不重复的记录。 >select distinct name from user; 9、向user表中插入记录。 >insert into user (id,name,pass) values (1,'zhangsan','123456'); 10、更新user表中的指定信息。 >update user set pass='123456' where name='zhangsan'; 11、给user表的pass字段后增加date字段。 >alter table user add column date char(8) after pass; 12、在user表中修改pass字段名及字段数据类型。 >alter table user change column pass password char(10); 13、在user表中删除date字段。 >alter table user drop column date; 14、删除user表中指定的信息。 >delete from user where id=1; 15、删除user表中所有的信息。 >delete from user; 16、删除user表。 >drop table user; 四、数据库权限操作 1、创建一个具有root权限,可从任意IP登录的账号test123。 >grant all privileges on *.* to ' test123'@'%' identified by '123456'; 2、创建一个针对mysqltest库具有数据操作权限的账号test1234,并且只能从192.168.1.10登录。 >grant select,insert,update,delete on mysqltest to 'test1234'@'192.168.1.10' identified by '123456'; 3、收回test1234账号针对mysqltest库的某些数据操作权限。 >revoke insert,update,delete on mysqltest from 'test1234'@'192.168.1.10' identified by '123456'; 4、删除test1234用户。 >drop user 'test1234'@'%'; 五、mysqld的备份还原 1、备份mysqltest数据库。 #mysqldump –u root –p 123456 mysqltest > bak_mysqltest.sql 2、备份mysqltest数据库下user表的数据。 #mysqldump –u root –p 123456 mysqltest user > bak_table_mysqltest_user.sql 3、备份mysqltest数据库,并压缩。 #mysqldump –u root –p 123456 mysqltest | gzip > bak_mysqltest.sql.gz 4、恢复mysqltest.sql到mysqltest库中。 #mysql –u root –p 123456 mysqltest 六、mysql其它命令 1、启动mysql服务。 #service mysqld start 源码包安装不适用 #/etc/init.d/mysqld start 源码包安装不适用 #/usr/local/mysql/bin/mysqld_safe –user=mysql & 2、关闭mysql服务。 #service mysqld stop 源码包安装不适用 #/etc/init.d/mysqld stop 源码包安装不适用 #/usr/local/mysql/bin/mysqladmin –p 123456 shutdown 这里的-p指的是mysql管理员账号的密码。 3、重启mysql服务。 #service mysqld restart 源码包安装不适用 #/etc/init.d/mysqld restart 源码包安装不适用 4、将源码包安装的mysql加入到开机自启动。 #echo "/usr/local/mysql/bin/mysqld_safe --user=mysql &" >>/etc/rc.local 5、将源码包安装的mysql加入环境变量中。 #echo "export PATH=$PATH:/usr/local/mysql/bin" >>/etc/profile 加入环境变量 #source /etc/profile 更新环境变量

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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