Farrokhp,

Let me suggest you something to answer most of Q`s related to this posting: Take last 6/12 issues of Oracle Magazine and there is a column in which they talk about big enterprises like ebay, yahoo. Their technology implementation and how best they are using Oracle and other servers technology in day to day business and even they talk about transaction growth, downtime issues/problems. This gives fair idea of whats your sytems to be built are in need of...