Choose the statement that best describes the query below: db.myCol.find().sort({_id:1});

Suppose we have a collection of users with different ages. Which call will find the oldest person with the name John?

Describe the best use case for choosing MongoDB map-reduce.

What is the minimum nodes required for replica?

Which is correct index types?

Given the below statement, please choose the most probable reason:- 'You have a web application with mongodb as a backend. A query returns a resultset, however when called a second time the result set is empty.'

In MongoDB, a query ____ consists of a combination of query, sort, and projection specifications.

What is a covered query?

Regarding aggregation pipeline optimization concepts in MongoDB, if you have a $sort followed by a $match:

Regarding storage in MongoDB, which is incorrect?

What is the maximum size of an Index key?