[MongoDB] : How Indexes works !

> use dbversitydb switched to db dbversitydb > > > for(i = 1; i <= 1000; i++) db.dbversity_website.insert( { post_id : i, comment_id : i, likes : i}); WriteResult({ “nInserted” : 1 }) > > > > db.dbversity_website.findOne() { “_id”…