Choose the statement that best describes how indexing improve query response time

Which method will shut down replica set?

How many members a replica set can have?

Which 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?

What will be the output of two command in MongoDB: db.mycol.insert({'_id':1}) db.mycol.insert({'_id':1})

Choose the best description of the output for the query below var weekAgo = Date.now() - (1000*60*60*24*7); db.visits_calc.group( { key:{date:true}, cond:{date:{$gt:weekAgo}}, reduce:function(obj, out) {out.day += obj.total}, initial:{day:0} });

Regarding data modeling in MongoDB, which of the following is correct ?

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

What kind of NoSQL database MongoDB is?