How to remove duplicates based on a key in Mongodb?

Question

I have a collection in MongoDB where there are around (~3 million records). My sample record would look like,

 { \"_id\" = ObjectId(\"50731xxxxxxxxxxxxxxxxxx         


        

Answer 1

While @Stennie's is a valid answer, it is not the only way. Infact the MongoDB manual asks you to be very cautious while doing that. There are two other options

1. Let the MongoDB do that for you using Map Reduce
   • Another way
2. You do programatically which is less efficient.