How to view sharding keys in mongodb shell?

Question

This might be a dummy question, but I cannot find any clue in all online doc.

For a already-built-up mongodb cluster, How can I find which sharding key(s) is used for given collecton?

Answer 1

As outlined in the Sharding Administration Docs, you can use db.printShardingStatus() to see this information.

For sharded collections it will print the key pattern.