集群之MYsql主从服务之引伸出Mysql互为主从(环形结构)外加简单实_MySQL
Mysql集群
备注：
本人资历很浅，说的不对话，万望各位前辈不要计较，
另关于环形的问题，我在后面的评论给予回复，
其实环形，解决多地域问题比较好的选择
关于配置步骤我重新整理了一下（主从AND环形）的配置步骤
在我博客中，有兴趣的朋友可以看一下，
http://my.oschina.net/u/1246814/blog/267518
多谢大家的指导.
比如 我有主的1台mysql服务器，俩从服务服务器 外加一个负载均衡器（如果把负载均衡器非常简单的来说话其实就DNS的转发，非常简单来说，其实 IP的轮换嘛）
我读数据的也就（查询）数据 也就（Select）语句时候，我只是在 仨台从服务器中读取数据
主服务器负责（增，删，改）这个一系列操作
顺便唠叨一下， 为啥 Select 我们建仨服务器或者多个呢？
因为距统计，大概B/S架构70%以上的操作都是以查为主（说白了就是展示嘛）
我们执行了DML语句那么负载均衡器，
就会把请求转发到主mysql服务器上,
这里有个问题？
我们已经向主服务器插入数据，或者删除数据，或者更新了数据，
那么是不是意味从服务里数据也应该发生变化呢
是的，从服务器肯定要发生变化的，不然就出现问题，
比如说，我删除了一个用户，
我查询一下被删除的用户， 丫的发现这个用户压根就没被删除，这不是搞笑了嘛，
那么就有了主从配置一说
主从原理：mysql中有一种日志叫做bin日志（二进制日志），
这个日志会记录下所有对MYSQL进行修改的SQL语句。当向主服务器执行SQL语句时，这条SQL语句会被传递到从服务器上再执行一遍。
说白了，就是Bin日志记录下Dml语句，直接到从服务器执行执行一遍相同的Dml操作，这个方式是以二进制，所有效率很好
至于什么时候用主从
1. 备份(如果数据库出现问题，马上再顶上)
2.优化（分流 读写分离）
Look看图
如果是Dml语句其实也可以直接访问主数据库，不必经过负载均衡器，那么这块从
话说回来哈， 负载均衡其实说白了吧，就是dns轮换，IP轮换嘛
如果可以话，其实我们自己也可以相对简单实现的，但这要分情况哈，
我提一个思路， 以MVC为例子 我粗狂简单的举一下列子，
1.在父类Model中对用户请求的sql语句进行分类。
1.1dml语句(update,insert,delelte)
1.2select语句
1.3dcl语句(数据控制语句)
1.4dtl语句(数据事务语句 )
1.5ddl语句(数据定义语句 )
2.我就以常用的dml 与select 语句为列子并拿3个台mysql服务器1台主mysql 2台从Mysql 与Linux系统为例子
对用户请求数据库的Sql指令进行进行统一分类，管理
主服务器IP: 192.168.0.1
从服务器IP: 192.168.0.2
从服务器IP: 192.168.0.2
3. 对用sql指令分析
如果是dml直接连接 192.168.0.1这台服务器
如果是select语句 怎么办呢？
1.我们首先要确定一个件事情要判断两台从服务器的负载大小
我们肯定要把请求发到负载比较小的服务器上是吧
那么我用socket用连接分别连接两台服务器，搞个类似远程控制客服端，
并利用top指令，对两台服务器的CPU内存等一些负载数据进行获取，
然后通过一些计算与比较最后把查询请求连接其中一个从服务器上。
然后就over
回归正题
关于Mysql环形结构也就mysql服务器互相为主从关系
虽然根据有关平台统计，B/S架构的平台70%以上都是都Select为主
那么如果我这个平台，就是（增，删，该）非常多，非常频繁怎么办呢？
如果是主从配置，那么我处理dml语句的就一台服务器，这不够嘛，这样主从服务器的缺点就暴露出来了
那么mysql的环形结构配置就能解决这样类似问题
原理也是利用bin日志来做
现在3个mysql服务器
我们随便向其中任何一台服务服务器执行dml语句，
那么Bin日志记录下Dml语句，
直接到其他服务器执行执行一遍相同的Dml语句操作
look图
完结
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