MCQs
As a client program assembles a query in MongoDB, it builds a BSON object, not a string.
Since copying multiple files is not an atomic operation, you must stop all writes to the mongod before copying the files.
You also can access information from arbitrary sections of files, which allows you to "skip into the middle of a video or audio file.
mongodump is a utility for creating a binary export of the contents of a database.
MongoDB preserves the order of the document fields following write operations.
The order of fields listed in a compound index has significance.
The dbStats command, or db.stats() from the shell, returns a document that addresses storage use and data volumes.
MongoDB clients should add an _id field with a unique ObjectId.
Backups produced by copying the underlying data do not support point in time recovery for replica sets and are difficult to manage for larger sharded clusters.
The command line and configuration file interfaces provide MongoDB administrators with a large number of options and settings for controlling the operation of the database system.