mongodb mysql 索引

mongodb 
索引交叉
https://docs.mongodb.com/manual/core/index-intersection/#index-intersection-compound-indexes

mysql sql 
https://docs.mongodb.com/manual/core/index-intersection/#index-intersection-compound-indexes


mysql index
http://wulijun.github.io/2012/08/21/mysql-index-implementation-and-optimization.html






stackflow
http://stackoverflow.com/questions/tagged/mongodb-indexes


index 整理
http://quentinxxz.iteye.com/blog/2125433




mongodb-indexes
http://www.cnblogs.com/cswuyg/p/4355948.html




mongodb index
http://blog.youkuaiyun.com/black_ox/article/details/22078501




计算代价
http://blog.itpub.net/564597/viewspace-988528/


mongodb组合索引
https://emptysqua.re/blog/optimizing-mongodb-compound-indexes/




mongodb index
http://stackoverflow.com/questions/33545339/how-does-the-order-of-compound-indexes-matter-in-mongodb-performance-wise/33546159#33546159