mysql 索引
标签：blog hash mysq post white ref color 比较 .net
mysql 索引
btree索引和hash索引的比较
http://mxdxm.iteye.com/blog/2196229
http://www.cnblogs.com/xiaoboluo768/p/5164342.html
btree索引详解：
http://blog.csdn.net/u011727893/article/details/52735688
http://blog.jobbole.com/86594/
索引的类型与实用优化：
http://www.jb51.net/article/49346.htm