The quality of indexed results is what matters. Anything else is inefficient. This seems to be confirmed by a paper from called " Estimating search engine index size variability: a 9-year longitudinal study ". In the study, researchers spent 9 years! What they found is that the index of search engines doesn't grow linearly.
It might not grow at all. Note how the Panda updates decrease Google's index size. I think that's why Google stopped reporting the index size: they realized it didn't matter as much as index quality.
They found all the thin and low-quality content in the index and decided to flip it around. There was a time when the index size was a huge indicator of quality for search engines.
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By Liz Moorehead on May 17, 5 min read. By Liz Moorehead on May 10, 6 min read. Search starts, of course, with crawling and indexing, and Google says that the web now has 30 trillion unique individual pages. That up an astonishing 30 times in five years: Google reported in that the web had just one trillion pages. Google says that it stores information about those 30 trillion pages in the Google Index, which is now at million gigabytes.
So algorithms for spelling, autocompletion, synonyms, and query understanding jump into action. Then, in just over an eighth of a second, Google then delivers the results to your computer, tablet, or phone.
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