google索引升级到80亿，初步的感觉在动态网页收录大大增加！同时加入了不少补充材料！仔细查一了下补充材料，看看 googleGuy给的解释吧！E文，懒的翻译了！：）
Hey, the supplemental results are a new experimental feature to augment the results for obscure queries. This is a new technology that can return more results for queries that for example have a small number of results. So it might not affect the results for a popular search, but for a researcher doing a more specific query, it can improve the recall of the results. The supplemental collection of pages has been collected from the web just like the 3.3 billion pages in Google's main index.
Hope that helps,
GoogleGuy
Hey, pages get added to the supplemental index using automatic algorithms. You can imagine a lot of useful criteria, including that we saw a url during the main crawl but didn't have a have a chance to crawl it when we first saw it. Think of this as icing on the cake. If there's an obscure search, we're willing to do extra work with this new experimental feature to turn up more results. The net outcome is more search results for people doing power searches.
"Sounds like an excuse for hiving off a chunk of the main index. Is this another pointer to capacity problems and people trying to invent ways round them?" Hi valeyard, and welcome to WebmasterWorld! The supplemental results are above and beyond the pages that we already search. So we're not taking away any docs--in fact, we're searching even more docs than before.
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