Mongodb mapreduce usage summary, mongodbmapreduce
This article is from my blog: mongodb mapreduce usage Summary
As we all know, mongodb is a non-relational database. That is to say, each table in the mongodb database exists independently and
Due to the limitations of the Nodejs itself, it is inefficient to use JS for high-volume calculation in the program. The V8 engine itself limits memory size (1.4G under 64-bit systems), which also limits the size of the data. Therefore, compared to
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Original: MongoDB Data summaryThe previous Redis Data summary topic is very popular, here the MongoDB series of information is also a simple collation. Hope to be useful to everyone. Last update time: 2013-04-22What is 1.MongoDB?
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When I first read the Mongodb getting started manual, I saw mapreduce. It was so difficult that I ignored it directly. Now, when I see this part of knowledge again, I am determined to learn it. 1. concept description: MongoDB's MapReduce is
Map/reduce in MongoDB makes some compound queries, because MongoDB does not support group by queries, and MapReduce is similar to SQL's group by, so it can be thought that MapReduce is the MongoDB version of group B Y
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