title: is it good to use different collections in a database in mongodb
body: <p>I am going to do a project using nodejs and mongodb. We are designing the schema of database, we are not sure that whether we need to use different collections or same collection to store the data. Because each has its own pros and cons. 
  If we use single collection, whenever the database is invoked, total collection will be loaded into memory which reduces the RAM capacity.If we use different collections then to retrieve data we need to write different queries. By using one collection retrieving will be easy and by using different collections application will become faster. We are confused whether to use single collection or multiple collections. Please Guide me which one is better.</p>