The first Google index in 1998 already had 26 million pages, and by 2000 the Google index reached the one billion mark. Over the last eight years, we’ve seen a lot of big numbers about how much content is really out there. Recently, even our search engineers stopped in awe about just how big the web is these days — when our systems that process links on the web to find new content hit a milestone: 1 trillion (as in 1,000,000,000,000) unique URLs on the web at once!
Google stopped displaying the size of its search index at around the 30 billion mark–which prevented a “mine is bigger than yours” tussle with Yahoo. While 1 trillion is an impressive number, keep in mind that this is not actually the size of Google’s current index.
We don’t index every one of those trillion pages — many of them are similar to each other, or represent auto-generated content similar to the calendar example that isn’t very useful to searchers.
Still, 1 trillion is a big number. Need a comparison? 1 trillion is the current price for a barrel of oil!!!!