前言：
最近Oracle MySQL在其官方Blog上贴出了 5.6中一些变量默认值的修改。其中innodb_old_blocks_time 的默认值从0替换成了1000（即1s）
关于该参数的作用摘录如下：
how long in milliseconds (ms) a block inserted into the old sublist must stay there after its first access before it can be moved to the new sublist. Increasing this value protects against the bu
