Create an index with MongoDb

Question

I\'m beginner with MongoDB and i\'m trying some stuff. I want to store URL and to avoid duplicate URL I create an unique index on the url. Like that

collection.c         


        

Answer 1

I don't fully understand your problem but I feel it's very likely that you should use ensureIndex instead of createIndex as the latter always tries to create the index while the former will only ensure that it exists.