MongoDB （Document Database）是由C++語言編寫的茄蚯，是一個(gè)基于分布式文件存儲(chǔ)的開源數(shù)據(jù)庫系統(tǒng)靡砌。
在高負(fù)載的情況下吨些，添加更多的節(jié)點(diǎn)气筋，可以保證服務(wù)器性能雪猪。
MongoDB 旨在為WEB應(yīng)用提供可擴(kuò)展的高性能數(shù)據(jù)存儲(chǔ)解決方案慈俯。
MongoDB 將數(shù)據(jù)存儲(chǔ)為一個(gè)文檔渤刃，數(shù)據(jù)結(jié)構(gòu)由鍵值(key=>value)對(duì)組成。MongoDB 文檔類似于 JSON 對(duì)象贴膘。字段值可以包含其他文檔卖子，數(shù)組及文檔數(shù)組。
MongoDB is an open-source document database that provides high performance, high availability, and automatic scaling.
A record in MongoDB is a document, which is a data structure composed of field and value pairs. MongoDB documents are similar to JSON objects. The values of fields may include other documents, arrays, and arrays of documents.
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