title: storing thumbs up/down in database or session?
body: <p>I want to add feature to rate (only thumb up or down) the comments. Since there will be lots of comments therefore I think storing the thumbs up or down for each comment will increase lots of data in the database. Is there an alternatuve and efficient way to avoid storing in database, for example by storing temperarily with cookies or session (as long as browser is open)? 
  Thank you for your expert views. If cookies/session is efficient, I'll highly appriciate any example how i can store following data temporary, for example,
  user_1 thumb_up  comment_1
  user_1 thumb_down comment_2</p>
  
  <p><strong>Edit:</strong> 
  Sorry, I think I was not very clear about my question. Is it efficient to store Only total number of the thumbsup/down. I don't want to store the IP address or the username of every user in database.</p>