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

Just stumbled over this question and there are some changes since Version 3.0.0

db.collection.ensureIndex(keys, options)

Deprecated since version 3.0.0: db.collection.ensureIndex() is now an alias for db.collection.createIndex().

Creates an index on the specified field if the index does not already exist.