有一些虚拟机、云主机提供商仍然使用的是老版本的安装套件。预装的应用软件版本很低。有些IDC使用的云服务器，其中MySQL预装版本
有一些虚拟机、云主机提供商仍然使用的是老版本的安装套件。预装的应用软件版本很低。有些IDC使用的云服务器，其中MySQL预装版本为老版本5.1.x。而较新的MySQL 5.6版本在性能、功能、安全性等方面都有了很多的改进。
要从最新版本获益，你需要把现有系统升级到5.5+（最新的版本是5.7），，我保守一点，升级到5.6.20。
有相关测试数据说明从5.1到5.5+，MySQL性能会有明显的提升，具体的需要自己建立测试环境去实践下。
1. 首先更新rpm
从MySQL Yum仓库下载最新的rpm文件：
（需要Oracle帐号以及填写一些使用信息，才能进入下载页面）
我需要下载的是：mysql-community-release-el6-5.noarch.rpm
2. 安装这个发布包
> yum localinstall mysql-community-release-el6-5.noarch.rpm
可以通过下面的命令来确认这个仓库被成功添加：
yum repolist enabled | grep "mysql.*-community.*
3. 安装MySQL服务器
> yum install mysql-community-server
新版本的目标文件是/usr/bin/mysql，如果原预装路径在/bin下面，则需要进行替换，最好是使用软链接，比如ln -s /usr/bin/mysql /bin/
这样在需要的时候，可以方便的在不同版本之间进行切换。（有时候需要版本回退来定位问题）
4. 重启服务器就可以了
> service mysqld restart
确认版本信息：
[root@west195246 bin]# mysql -V
mysql Ver 14.14 Distrib 5.6.20, for Linux (x86_64) using EditLine wrapper
参考阅读：
--------------------------------------分割线 --------------------------------------
Ubuntu 14.04下安装MySQL
《MySQL权威指南(原书第2版)》清晰中文扫描版 PDF
Ubuntu 14.04 LTS 安装 LNMP Nginx\PHP5 (PHP-FPM)\MySQL
Ubuntu 14.04下搭建MySQL主从服务器
Ubuntu 12.04 LTS 构建高可用分布式 MySQL 集群
Ubuntu 12.04下源代码安装MySQL5.6以及Python-MySQLdb
MySQL-5.5.38通用二进制安装
--------------------------------------分割线 --------------------------------------
本文永久更新链接地址：
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