43 Aggregation Example 21 $out - MongoDB Aggregation Tutorial

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  1. Bogdan Stashchuk
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This video is part of my full-length course “MongoDB Essentials - Complete MongoDB Guide”.
In this course I teach all what you need to know about MongoDB and I start from the very beginning and explain how MongoDB works behind the scenes.

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Bogdan_Stashchuk
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Great content Sir. i appreciate it. i have a doubt please address it if you could.

Let's assume i have 9000 unique user records in mycollection, and let's assume mycollection has users from 2000 unique cities .
if i use $group by city in my aggregation function, Will aggregation function processes all those 9000 records and give me the grouped result of 2000 cities ? or will the aggregation framework consider only 1000records for processing and give me grouped result of <= 1000 cities?

i have this query because i read in docs that mongo has a default batchsize and it can process/return only 1000 records. if you could provide me details regarding this that will be helpful.

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