Which of the following is the correct order in pipelining in mongo aggregation?

For the mongo shell function below function last(N) { return db.collection.find().skip(db.collection.count() - N); }

Why use replication?

Choose the statement that best describes the query below: db.myCol.find().sort({$natural:-1}).limit(50);

In a shared replica set environment, w defined the level and kind of write concern. Which value of w specifies ti return success only after a majority of voting members have acknowledge?

For a large data set in terms of size on the volume your MongoDB is exhibiting poor write performance. Choose the most probable reason

Which command will find all the posts that have been tagged as tutorial?

What kind of NoSQL database MongoDB is?

Which is atomic operations in MongoDB?

Point out the wrong statement :

Which is correct about Capped Collections?