本文系统Centos6.0MySQL代理是一个介于MySQL客户端和MySQL服务器之间的简单程序,可用来监视、分析或者传输他们之间的通讯。他的灵活性允许你最大限度的使用它,
本文系统Centos6.0
MySQL代理是一个介于MySQL客户端和MySQL服务器之间的简单程序,可用来监视、分析或者传输他们之间的通讯。他的灵活性允许你最大限度的使用它,香港服务器,虚拟主机,这些包括负载平衡、容错 、分析查询和修正等等。
master : 192.168.182.128
slave :192.168.182.129
mysql-proxy:192.168.182.130
1、主从服务器安装数据库;
master、slave操作:
[root@master ~]# yum install mysql mysql-devel -y配置主从复制;
master:
vim /etc/my.cnf log-bin=mysql-bin #新增 server-id=1 #新增slave:
vim /etc/my.cnf log-bin=mysql-bin #新增 server-id=2 #新增master: 添加授权用户;
mysql> grant replication slave on *.* to 'leo'@'%' identified by 'leo123';slave:
mysql> change master to master_host='192.168.182.128',master_user='leo',master_password='leo123',master_log_file='mysql-bin.000001',master_log_pos=247; mysql> start slave;查看状态:
主从复制ok;
下面在mysql-proxy上配置读写分离;
[root@mysql-proxy ~]# wget [root@mysql-proxy ~]# useradd -r mysql-proxy [root@mysql-proxy ~]# tar zxvf mysql-proxy-0.8.3-linux-glibc2.3-x86-32bit.tar.gz -C /usr/local [root@mysql-proxy ~]# mv /usr/local/mysql-proxy-0.8.3-linux-glibc2.3-x86-32bit /usr/local/mysql-proxy [root@mysql-proxy ~]# export PATH=$PATH:/usr/local/mysql-proxy/bin/ [root@mysql-proxy ~]# echo "PATH=$PATH:/usr/local/mysql-proxy/bin" >> /etc/profile这里先来介绍下mysql-proxy的相关参数;
下面我们启动下:
首先在master\slave上创建用来远程的测试用户
master:
mysql> grant all on *.* to root@'%' identified by 'root123';slave上就不操作了;我配置mysql库也同步;所以无需多余操作;
开始启动:
[root@mysql-proxy ~]# mysql-proxy --daemon --log-level=debug --user=mysql-proxy --keepalive --log-file=/var/log/mysql-proxy.log --plugins="proxy" --proxy-backend-addresses="192.168.182.128:3306" --proxy-read-only-backend-addresses="192.168.182.129:3306" --proxy-lua-script="/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua" --plugins=admin --admin-username="admin" --admin-password="admin" --admin-lua-script="/usr/local/mysql-proxy/lib/mysql-proxy/lua/admin.lua"查看相关信息:
495进程是mysql-proxy启动该进程
root是keepalive在起作用;进程崩溃时尝试重启;这也是mysql-proxy新的特性;
4040是proxy端口;4041是admin端口;也就是管理
下面进行测试了;
开几个终端;
登录admin查看
因为rw-splitting.lua脚本默认有4个链接才启用分离;所以多开启几个终端;多测试几下;你也可以去修改里面的相关值;
出现该state;分离成功;
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,虚拟主机
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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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