Are there any tools to estimate index size in MongoDB?

Question

I\'m looking for a tool to get a decent estimate of how large a MongoDB index will be based on a few signals like:

• How many documents in my collection

Answer 1

You can check the sizes of the indexes on a collection by using command:

db.collection.stats()

More details here: http://docs.mongodb.org/manual/reference/method/db.collection.stats/#db.collection.stats