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Google Algorithm Change History

Google algorithm updates and data refreshes

Google Algorithm Updates of 2010

Complete list of Google algorithm updates for 2010.

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# Date Update Update type Noticeable effect
2 Jun 8, 2010 Caffeine Infrastructure None
1 May 3, 2010 May Day Ranking signals No estimate given

Caffeine: June 8, 2010

Google Index Infrastructure Change

Similar to the Bigdaddy update of 2005, Caffeine was a major overhaul to Google's indexing system, this time bringing real-time results to Google search. Caffeine's infrastructure improvement delivered 50 percent fresher results than Google's previous index architecture—with search listings appearing as quickly as a few minutes after content being published.

Caffeine was first made available as a developer's preview for user testing and feedback in August 2009.

The Caffeine update was considered necessary in order to keep up with the rise in popularity of real-time social media platforms such as Facebook and Twitter.

According to Google's official statement on June 8, 2010:

Our old index had several layers, some of which were refreshed at a faster rate than others; the main layer would update every couple of weeks. To refresh a layer of the old index, we would analyze the entire web, which meant there was a significant delay between when we found a page and made it available to you.

With Caffeine, we analyze the web in small portions and update our search index on a continuous basis, globally. As we find new pages, or new information on existing pages, we can add these straight to the index. That means you can find fresher information than ever before—no matter when or where it was published.

Notable Changes

  • Indexing speed: The latest relevant content found and indexed the instant its published, with hundreds of thousands of pages processed in parallel
  • Index size: Caffeine rolled out with nearly 100 million gigabytes of storage in one database, adding hundreds of thousands more of gigabytes per day
  • Relevance: Caffeine was not an algorithmic change; however, search results improved due to up to the minute indexing
  • Scaling: Caffeine was designed to scale with the growth of the Web

Further Reading


May Day: April/May, 2010

Change in Ranking Signals

The May Day update was conceived to help return higher quality sites for long tail keyword Google searches. This algorithmic change lessened the chances of a site ranking for relatively long keyword queries without displaying significant contextual relevance and authority. In other words, a web page with multiple exact matches for a search query such as 'absolutely the best definition of Google's May Day update', might still be omitted from results if other quality signals are missing from the content.

Further Reading


See More Google Algorithm Updates by Year

As Google's algorithms improve, search-friendly website rankings do as well. New to the SEO game? Learn the search engine optimization basics.

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