Map Reduce In MongoDB | Learn To Use Map Reduce In MongoDB | MongoDB - Map Reduce | SimpliCode

The fundamentals of the Map Reduce Method used in MongoDB will be Clearly Understood by Watching this Tutorial. MongoDB - Map reduce function is widely used to access large datasets into a handful of aggregated results. In this Tutorial on MongoDB Map Reduce, we shall learn to use MapReduce () function for performing aggregation operations on a MongoDB Collection with the help of examples. This MongoDB Tutorial will demonstrate the fundamentals of the MapReduce function with the help of syntax and Commands. In Addition, You will understand how MapReduce Function works with theoretical and practical examples for a better learning Experience.

The following are the topics covered in this Tutorial:

0:00:00 Introduction to MongoDB MapReduce
0:01:30 What is MapReduce() in MongoDB?
0:01:56 Why use MapReduce()?
0:02:15 MapReduce syntax and Parameters
0:05:23 How Do MapReduce Functions Work in MongoDB?
0:08:50 Execution MapReduce Commands in MongoDB shell
0:16:52 How MapReduce is Different from Aggregation Pipeline?

👉 What is MapReduce in MongoDB?
The map-reduce function is a data processing method that reduces large datasets into useful aggregated results.MapReduce () command is used to execute this function. As a result, the data is independently mapped and reduced in different spaces before being combined in the function and saved to the specified new collection. This MapReduce () function was designed to only work with large data sets. You can perform aggregation operations like max and avg on data using Map Reduce, similar to groupBy in SQL. It works independently and in parallel with data aggregation methods.

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Got a Question on this topic? Let us know in the comment section below 👇 and we'll have our experts answer it for you.

[VivekGuleria-di]

Marks are taken as string values that's why sum or avg operations concatenating those values instead of doing actual sum, so first they need to convert into int

[katw]

thanks for this video Don't know why the you-tube's not create the videos on unique topics every one is following bhed-chal

[HiteshJadhav-rlpx]

bro you are using marks as string thats why its not adding two strings

[vineetbabar]

Bro you just used "Marks" instead of "marks" in the reduce function.

[katw]

values are concatenate that's why answer is wrong

[Pranjaydharkar]

Simply reading no explanation nothing waste of time