Google Search Index Update Analysis

I have recently found some changes in the Google search index and that is very frequently, As we all know the Google Pagerank, Google Backlinks updates are in progress. Yesterday we have recieved many hits from Google bot and Feedfetcher. Google Dance has started and we will soon recieve Pagerank and backlinks listed in Google Search. Normally Googlebot hits increases when google updates his index or any updatein Google is going on.