MongoDB: Sharding on single machine. Does it make sense?

Question

created a collection in MongoDB consisting of 11446615 documents.

Each document has the following form:

{ 
 \"_id\" : ObjectId(\"4e03dec7c3c365f57482         


        

Answer 1

No, it does not make sense to shard a on a single server.

There are a few exceptional cases but they mostly come down to concurrency issues related to things like running map/reduce or javascript.