for (var i = 1; i <= 100000; i++) {

  db.testdata2.insert( { x : i , name: "MACLEAN" , name1:"MACLEAN", name2:"MACLEAN", name3:"MACLEAN"} )

}

use testdata2

for(var i=1;i<=10000;i++){db.data.insert({

     x:i,name:"MACLEAN",name1:"MACLEAN",name2:"MACLEAN",name3:"MACLEAN"

 })}

 

 

db.data.find({x:{$gt:40}}).explain();