If you have a compound index on multiple fields (a,b,c), you can use it to query on:

What is the correct aggregation pipeline to prefix all the values of the 'name' column in the 'test' collection?

How many collections are created when use use gridfs to store large files

The equivalent for like %keyword% on mongodb find is:

Which of the following is the correct operation to query a document for both 'Football' and "Reading" within the interests data collected from a profile?

Which of the following statements are true about the MongoDB Write Consistency model

What is the recommended way to delete a user?

Suppose your aggregation pipeline terminated with an exception referring to exceeded memory limit. What is the best way to resolve the issue?

In the MongoDB shell, how can you tell if an index was used with a query?

Choose the shell command that connects to a MongoDB database.

To import a JSON array into Mongo, what flags are needed with MongoDBimport?