Which of the field is reserved for use as a primary key ?

________ subtracts two dates to return the difference in milliseconds

Object_Id is similar to _________ key in Relational Databases

In the mongo shell, you can access the creation time of the ObjectId, using the ______ method..

_____________ is used to initiate relica member set.

To generate pseudo-random data to use for a keyfile, issue the following __________ command.

GridFS uses a _________ index on the chunks collection for the files_id and n fields.

Which of the following query is used to generate a new ObjectId, use the ObjectId() constructor with no argument

If you create the user administrator before enabling access control, MongoDB disables the ________ exception.

If you use the localhost exception when deploying a new MongoDB system, the first user you create must be in the ________ database.