mysql 索引文章

http://hi.baidu.com/mesong1/item/da7ca2ccb637052de90f2e7a

http://linux.chinaunix.net/techdoc/system/2009/07/20/1125190.shtml

http://www.cnblogs.com/kupig/archive/2011/10/19/2217228.html

http://blog.csdn.net/yjj1s/article/details/6253140

 http://book.51cto.com/art/200906/132448.htm

事务隔离级别：

10.3.1 可重复读(RR-Repeatable Read)

http://book.51cto.com/art/200906/129571.htm

http://book.51cto.com/col/1220/

http://www.cnblogs.com/ggjucheng/archive/2012/11/14/2770445.html

MySQL索引背后的数据结构及算法原理

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