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zIZdRQ?5d};-dg4yJM-$8vD(<@cQa*lSUKDBhibqzz~XhO>?lG_adr=hhQPi6Q(D;8 zII{mvT@ZnEwkB14z>hXz8C#@iVc?4kh$58*X4yZ~T=)<0n_cKJ%L}vc;`&MN`wH-g z4xnq959W)mvO-aWgHm>gh@LR{A04D@fzj0*t>BT1aJ$B!7_XvbJHt$yJ47!_hJ3L{ zKy47ALujw;+A6AgicMYH+QqmI!J2H+)@j@uR8%pUF#!t7_o8=h!KmXwd< z0faF7=f0XwUi+m-cwr6%B;XAmKJ&x~#c5nMn%IH5oUO6bDyip&vzBH9ip0hbs8x|j zLRy2>iNGArft!w6j6^(f_jSed1y-h z1YI03l^48`FkExYP MySQL' +draft: false +lang: '' +--- +# 什么是MySQL的主从同步机制 + +MySQL的主从同步机制是一种数据复制技术,用于将住数据库上的数据同步到一个或者多个从数据库中。 +主要是通过二进制日志 binlog 实现数据的复制。 +主数据库在执行写操作的时候,会把这些操作记录在binlog里面,然后推送给从数据库,从数据库重放对应的日志即可完成复制。 + +# MySQL主从复制类型 + +MySQL支持异步复制,同步复制,半同步复制 + +异步复制: 主库不需要等待从库的响应(性能高,一致性低) +同步复制: 主库同步等待所有从库确认收到的数据(性能差,一致性高) +半同步复制: 主库等待至少一个从库确认收到数据(性能折中,数据一致性比较高) + +## 异步复制 + +![](https://blog.meowrain.cn/api/i/2025/09/09/y283pk-1.webp) + +MySQL默认是异步复制。 + + +# 主从复制流程 + +1. 线程创建,从服务器创建一个IO线程,一个SQL线程,IO线程负责读取主服务器上的binlog,并写入到本地relay log中,SQL线程负责读取relay log中的日志,并执行到从服务器上 +2. 连接建立: 从服务器的IO线程与主服务器建立连接,主服务器的binlog dump线程和从服务器的IO线程进行交互 +3. 从服务器的IO线程告诉主服务器开始日志传送的对应位置 +4. 主服务器更新的时候把记录保存到binlog中 +5. 主服务器dump线程检测到binlog变化,从指定位置开始读取,从服务器进行拉取。 +6. 中继日志存储: 从服务器的IO线程把接收到的内容保存到relay log中 +7. 数据写入: 从服务器的SQL线程读取relay log中的内容,进行数据写入。 + +# 主从复制延迟 + +主从复制延迟是指主服务器和从服务器之间数据同步的时间差。 +主从复制延迟的原因有很多,例如网络延迟,主服务器和从服务器之间的硬件差异,主服务器和从服务器之间的操作系统差异,主服务器和从服务器之间的MySQL版本差异,主服务器和从服务器之间的MySQL配置差异等。 + +解决方法: +优化网络 +提高从服务器性能 +利用MySQL并行复制功能提升效率,减少延迟。https://blog.csdn.net/weixin_42587823/article/details/144842206 \ No newline at end of file