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| database search engine ： ウィキペディア英語版 |
database search engine
A database search engine is a search engine that operates on material stored in a digital database.
== Search engines ==
Categories of search engine software include:
* Web search or full-text search (e.g. Lucene).
* Database or structured data search (e.g. Dieselpoint).
* Mixed or enterprise search (e.g. Google Search Appliance).
The largest online directories, such as Google and Yahoo, utilize thousands of computers to process billions of website documents using web crawlers or spiders (software), returning results for thousands of searches per second. Processing high query volumes requires software to run in a distributed environment with redundancy.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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