MYSQL 多实例运行 mysql可以以多实例的方式,实现一台服务器,运行在不同端口不同数据文件的mysql,它们是相互独立的。 1、关闭原有的默认端口3306的mysql:service mysqd stop 2、拷贝或创建数据文件 ? #拷贝现有的mysql数据库文件#我的在/var/lib/mysql,拷
MYSQL 多实例运行mysql可以以多实例的方式,实现一台服务器,运行在不同端口不同数据文件的mysql,它们是相互独立的。
1、关闭原有的默认端口3306的mysql:service mysqd stop
2、拷贝或创建数据文件
?
#拷贝现有的mysql数据库文件 #我的在/var/lib/mysql,拷贝一份至mysql_3307文件夹 [root@test-206 ~]# cp -r /var/lib/mysql /var/lib/mysql_3307
?
#创建一个新的空数据库 [root@test-206 ~]# mkdir /var/lib/mysql_3307 [root@test-206 ~]# mysql_install_db --datadir=/var/lib/mysql_3307 --user=mysql
?3、给数据文件赋予mysql用户与用户组
[root@test-206 ~]# chown -R mysql.mysql /var/lib/mysql_3307
?4、创建multi的配置cnf文件,用于启动这个mysql实例(如3307)载入执行
[root@test-206 ~]# touch /usr/local/my_multi.cnf
?文件中写入你想要的配置,如下为典型配置
[mysqld_multi] mysqld = /usr/bin/mysqld_safe mysqladmin = /usr/bin/mysqladmin user = root #用于登陆和关闭此服务 password = 123456 #同上 [mysqld3307] socket = /tmp/mysql_3307.sock port = 3307 pid-file = /var/lib/mysql_3307/3307.pid datadir = /var/lib/mysql_3307/ log = /var/lib/mysql_3307/3307.log character-set-server = utf8 user = mysql
?5、启动你的多实例
[root@test-206 ~]# mysqld_multi --defaults-extra-file=/usr/local/my_multi.cnf start 3307
?6、检查是否启动成功
[root@test-206 ~]# netstat -ntlp tcp 0 0 :::3306 :::* LISTEN 3919/mysqld tcp 0 0 :::3307 :::* LISTEN 15027/mysqld
?
如果没有发现你要的端口号mysql实例,可以检查下/var/lib/mysql_3307/3307.log文件,排除问题
7、设置新的密码
[root@test-206 ~]# mysqladmin -uroot -S /tmp/mysql_3307.sock password 123456
?8、登入你的新实例
[root@test-206 ~]# mysql -uroot -S /tmp/mysql_3307.sock -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.5.20-log Distributed by The IUS Community Project Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
?再次确认下,你的这个实例,是不是用的mysql_3307这个文件夹的数据
mysql> show variables like '%datadir%'; +---------------+----------------------+ | Variable_name | Value | +---------------+----------------------+ | datadir | /var/lib/mysql_3307/ | +---------------+----------------------+ row in set (0.00 sec) mysql>
?恩,没有错!最后,搞搞权限、用户之类。收工!
#查用户 mysql> select user,host from mysql.user; +------+-----------+ | user | host | +------+-----------+ | root | 127.0.0.1 | | root | ::1 | | | localhost | | root | localhost | | | test-206 | | root | test-206 | +------+-----------+ rows in set (0.00 sec) #设权限 mysql> grant all on *.* to root@'%' identified by 'root' with grant option; Query OK, 0 rows affected (0.00 sec) ##查权限 mysql> show grants for root; ##创用户 mysql> grant select on *.* to backup@'%' identified by 'backup'; Query OK, 0 rows affected (0.00 sec)
?

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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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