The document data store stores the text and meta data the crawler retrieves, it must allow for very fast access to a large amount of documents. Text can be compressed relatively easily, and pages are typically indexed by a hash of their URL. Googlea#39;s original patent used a system called BigTable, Google now keeps documents in sections called shards distributed over a range of data centres (this o ersanbsp;...
Title | : | Seo Theory & Practice |
Author | : | Christopher Doman |
Publisher | : | Christopher Doman - |
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