One of the documents in your collection has an _id based upon an older database design and you want to change it. You write an update command to find the document and replace the _id but the _id isn't changed. How should you fix the issue?

A compound index allows you to _ ?

Why are ad-hoc queries useful?

How often do the members of a replica set send heartbeats to each other?

Which command returns all of the documents in the customers collection?

Given a cursor named myCursor, pointing to the customers collection, how to you get basic info about it?

What do drivers use with protocol on the wire?

What is the extra space allocated to document on the disk to prevent moving a document when it grows as the result of update() operations.

MongoDB document names cannot start with the characters:

Which of the following binaries handles routing of sharded queries to the proper shard?

An operation is said to be "idempotent" if it is proven to: