title: What probably should be facebook DB design
body: <p>I was just wondering how many db queries might facebook be issuing to render a user's home page. Does anybody have some idea on how the facebook DB is designed. I've heard it runs MySql and there are thousands of replica plus more memcache server than DB Servers.</p>
  
  <p>Is the facebook data shard-ed?</p>
  
  <p>If it is does it go to every shard and search for the latest update of my friend. In worst case if I've 100 friends and suppose facebook has 101 shards, there is a possibility that each of my friend is in a different shard. How might facebook be handling this?</p>
  
  <p>I'll be highly grateful if somebody can provide me seom hints or pointers towards something like "How to Design a DB for Social Networking Website". I'm just curious!</p>