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Web crawling is one of the most important applications of the Internet; the selection of database storage directly affects the performance of search engines. In the past few decades, the traditional relational databases almost monopolize all areas of the database applications. However, with the continuous development of web applications, they are facing the severe challenges. NoSQL database is the broad definition of non-relational data storage. This paper gives the data storage structure and query of relational database and NoSQL database MongoDB to meteorological BBS information collection system, and the advantage and the disadvantage are listed in data structure, query and scalability.
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