How Do Search Engines Index Websites?

Indexing Process of SEO - by SEO Help

There is a lot of speculation about how search engines index websites. The topic is shrouded in mystery about exact working of search engine indexing process since most search engines offer limited information about how they architect the indexing process. Webmasters get some clues by checking their log reports about the crawler visits but are unaware of how the indexing happens or which pages of their website were really crawled.

While the speculation about search engine indexing process may continue, here is a theory, based on experience, research and clues, about how they may be going about indexing 8 to 10 billion web pages even so often or the reason why there is a delay in showing up newly added pages in their index. This discussion is centered around Google, but we believe that most popular search engines like Yahoo and MSN follow a similar pattern.

Google runs from about 10 Internet Data Centers (IDCs), each having 1000 to 2000 Pentium-3 or Pentium-4 servers running Linux OS.

Google has over 200 (some think 'over 1000') crawlers / bots scanning the web each day. These do not necessarily follow an exclusive pattern, which means different crawlers may visit the same site on the same day, not knowing other crawlers have been there before. This is what probably gives a 'daily visit' record in your traffic log reports, keeping web masters very happy about their frequent visits.

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