汇总一些mongo性能优化的
10 Key MongoDB Performance Indicators
http://www.slideshare.net/iammutex/10-key-mongodb-performance-indicators
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Optimizing MongoDB: Lessons Learned at Localytics
http://www.slideshare.net/andrew311/optimizing-mongodb-lessons-learned-at-localytics
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MongoDB connection?overhead
http://blog.boxedice.com/2011/06/08/mongodb-connection-overhead/
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How to save 200% RAM by selecting the right key data type for #MongoDB
http://notes.alexdong.com/choose-the-right-data-type-for-mongodb? （Fanqiang）
