Which of the following operations on a single document will operate atomically?

Which SQL terminilogy is same as $match in MongoDB?

Which command can be used to check the size of a collection named user?

Which command can be used to check the size of a collection named user?

Which method in MongoDB replaces the existing document with the new document passed as parameter?

Consider the following document from the products collection: { _id: 1, product_code: '1234', variations: [ { size: 'L', price: 1000 }, { size: 'M', price: 800 } ] } What does the following query using $elemMatch return? db.products.find( { product_code: '1234' }, { variations: { $elemMatch: { size: 'L' } } } )

Which is captured by the Database Profiler in MongoDB ?

Which is a correct command to insert a document in a database called album and collection called songs?

The query below returns a collection of users with a projection db.users.find({}, {name: 1, _id : 1}) Choose the best statement that describes how to extract a collection of users with the projection that shows the creation date

Which operation add a new document to the users collection ?

If you are using { upsert: true } option in your update command, which parameter will be used to determine if any new documents were inserted: