http://dba.stackexchange.com/questions/65554/mongodb-insert-performance-rapidly-dropping

http://www.searchdatabase.com.cn/showcontent_51990.htm

http://wenku.baidu.com/link?url=V0zYX47g_mVgr4sncymgGJpyPPtnE93gNa8o7D07wix8z4JHelTN0h6XZmYm6HymeMKDERl-JVcpVDK3w3IYLRbZkE1SDtj0hJYkNLiQ3nu

http://www.cnblogs.com/renyb/archive/2013/01/18/2866632.html

http://architects.dzone.com/articles/use-mongosniff-see-what-your

http://docs.mongodb.org/manual/reference/program/mongosniff/

http://huoding.com/2011/08/09/104