MySQL数据库优化（一）_MySQL
数据库优化是一项很复杂的工作，因为这最终需要对系统优化的很好理解才行。尽管对系统或应用系统的了解不多的情况下优化效果还不错，但是如果想优化的效果更好，那么就需要对它了解更多才行。
本章主要讲解了几种优化MySQL的方法，并且给出了例子。记着，总有各种办法能让系统运行的更快，当然了，这需要更多的努力。
1 优化概述
让系统运行得快得最重要因素是数据库基本的设计。并且还必须清楚您的系统要用来做什么，以及存在的瓶颈。
最常见的系统瓶颈有以下几种：
磁盘搜索。它慢慢地在磁盘中搜索数据块。对现代磁盘来说，平时的搜索时间基本上小于10毫秒，因此理论上每秒钟可以做100次磁盘搜索。这个时间对于全新的新磁盘来说提高的不多，并且对于只有一个表的情况也是如此。加快搜索时间的方法是将数据分开存放到多个磁盘中。
磁盘读/写。当磁盘在正确的位置上时，就需要读取数据。对现代磁盘来说，磁盘吞吐量至少是10-20MB/秒。这比磁盘搜索的优化更容易，因为可以从多个媒介中并行地读取数据。
CPU周期。数据存储在主内存中(或者它已经在主内存中了)，这就需要处理这些数据以得到想要的结果。存在多个?硐啾饶诖嫒萘坷此蹈
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