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Line 1: {{copy edit\|date=June 2015}} Categories of [[search engine]] software include web search or full-text search (e.g., [[Lucene]]), [[database]] or [[structured data]] search such as Diesel point, mixed or [[enterprise search]] like [[Google Search Appliance]]. The largest online directories, such as [[Google]] and [[Yahoo]], utilize hundreds of thousands of computers to process billions of website documents using web crawlers(spiders), then return results for thousands of searches per second. Processing high volumes of queries requires software to run in a highly distributed environment with a high degree of redundancy. == Modern search engine components ==

Database search engine: Difference between revisions