MongoDB $addToSet vs $push (speed)
arrays, mongodb, mongodb-query, time-complexity
Solution
The `push()` should be faster, because it has not to check for duplicates like `addToSet()` needs to. There is also a description on how to profile in the documentation if you want to test both methods in a real world like setup.
Problem
I have a collection of 150 million documents in a database in MongoDB and I want to add an array field to each document (keywords) ``` { Subject: "value1", Object: "value2", "keywords": [A,A,B,C,D] } ``` So the field I want to add elements to is "keywords". Should I do `addToSet(A)` or `push(A)`? I don't care about duplicates. So the above example is correct. But I only care about speed. which one is faster (time wise) `$addToSet` or `$push` ??