Mysql 基础之 索引

转载自 ：  由浅入深探究mysql索引结构原理、性能分析与优化

相关参考 ： 

http://www.cnblogs.com/hustcat/archive/2009/10/28/1591648.html

http://www.cnblogs.com/oldhorse/archive/2009/11/16/1604009.html

http://blog.csdn.net/zuiaituantuan/article/details/5909334

http://www.codinglabs.org/html/theory-of-mysql-index.html

http://isky000.com/database/mysql_order_by_implement

http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html

http://www.docin.com/p-211669085.html