How to choose WiredTiger engine over MMAPv1?

Question

MongoDB

1. Can this be done during installation?
   
2. How to do it after installation?
   

PS: Tell me as a beginner who has not touched the inside of MongoDB and is just starting to work with it.

Answer 1

1. Can be selected when launching an instance via the option --storageEngine docs.mongodb.org/manual/reference/program/mongod/#...
1a. Instead of command line options, options can be passed via config: docs.mongodb.org/manual/reference/configuration-options
2. Can be selected when creating a collection: https://docs.mongodb.org/v3.0/reference/method/ db....