I dont recall the question number in the final, but there is a question that asserts as true the statment “–wiredTigerDirectoryForIndexes” allows for putting indexes on another device" (to paraphrase). That statement is in fact false. That option allows for indexes for a database to be located in a sub-directory under the database directory. Per Mongo docs:
When you start mongod with
--wiredTigerDirectoryForIndexes , mongod stores indexes and collections in separate subdirectories under the data (i.e.
--dbpath ) directory. Specifically, mongod stores the indexes in a subdirectory named
index and the collection data in a subdirectory named
That subdirectory can be symlinked to another device but that was not part of the question. Answered a question correctly but missed it because the answer in the test is incorrect.