2. About me
• Ph.D. in PKU
• Maze, CANT, MAPS
• Microsoft Asia Fellow
• Director in KUWO
• Personalized Radio
• Web Platform, Online Show
• 50+ team & tens of millions income
• Senior Expert in BABA
• SUOPINGBAO
• Ali Knowledge Graph
• O2O Advertising
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• Co-founder of BitTiger
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Summary of MongoDB
• MongoDB saves documents whose attributes can be updated freely
• MongoDB adds paddings into documents to reduce fragments
• MongoDB uses pre/next points to increase lookup speed
• MongoDB saves the documents into a sequence of 16M, 32M, … 2GB files
• MongoDB uses BTree (a better version of BST) to build index
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