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

Under what conditions is it required to use the db.getCollection() method in the mongo shell to delete a collection?

What kind of NoSQL database MongoDB is?

Which is atomic operations in MongoDB?

Point out the wrong statement :

Which is correct about Capped Collections?

What is the default size of GridFS chunk?