title: Olx-like database design
body: <p>Friends i am working on a web project that is a free classified ad site. Its just like <a href="http://www.olx.com" rel="nofollow">http://www.olx.com</a>. I am not getting the idea of how <a href="http://www.olx.com.database" rel="nofollow">http://www.olx.com.database</a> is designed. can anyone help me in this regard. i just need the "big picture" not minor details. Means how they have structured their database in relation to their product/service categories and how data passes to database etc.</p>