编译 升级mysql的一些注意问题 如php连接 mysqlnd phpmyadmin
对于 InnoDB 引擎的，拷贝data目录下的ib_logfile0，ib_logfile1，ibdata1和数据库文件夹（里面只有frm文件）
不要惧怕版本啦，my.cnf设置了什么问题，尽管去冷备份好了，如果感觉大，可以tar压缩，压缩效率吓人
对于myisam引擎的，拷贝data目录下的数据库文件夹（含MYD,MYI,frm）
当然最好用cp -pr 命令，p是保存属性的意思。
编译安装mysql指明路径的话，尽可放心，当然如果不能编译时设置sock文件和pid文件的话，在my中指定也可以，最好在备份时
执行ps aux|grep mysql 查一下原来的设置的sock，pid，log，data路径
关于与php的链接，现在看来是php的问题，无关于mysql和php的安装的先后问题（mysq5.6.23，php5.6），链接方式用了mysqlnd
php是用php56w的源安装的，因为它不是很重要，安装在哪个目录中没有关系（我的服务商只提供数据盘的每周备份）
ps：开始，php无法链接上数据库，查了半天发现在phpinfo信息表中mysql client api 是老版本的，不是mysqlnd，在php5.5以后默认提供的是mysqlnd了
即使pdo mysql方式好像也没提供
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