# Database search engine

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> Markdown URL: https://mediated.wiki/source/Database_search_engine.md
> Source: https://en.wikipedia.org/wiki/Database_search_engine
> Source revision: 1184144041
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

A '''database search engine''' is a [search engine](/source/search_engine) that operates on material stored in a digital [database](/source/database).

== Search engines ==

Categories of search engine software include: 
* Web search or full-text search (e.g. [Lucene](/source/Lucene)).
* [Database](/source/Database) or [structured data](/source/structured_data) search (e.g. [Dieselpoint](/source/Dieselpoint)).
* Mixed or [enterprise search](/source/enterprise_search) (e.g. [Google Search Appliance](/source/Google_Search_Appliance)). 

The largest online directories, such as [Google](/source/Google) and [Yahoo](/source/Yahoo), utilize thousands of computers to process billions of website documents using [web crawlers](/source/web_crawlers) or [spiders (software)](/source/spiders_(software)), returning results for thousands of searches per second. Processing high query volumes requires software to run in a distributed environment with redundancy.

== Components ==

Searching for textual content in [databases](/source/databases) or [structured data](/source/structured_data) formats (such as [XML](/source/XML) and [CSV](/source/Comma-separated_values)) presents special challenges and opportunities which specialized search engines resolve. [Databases](/source/Databases) allow logical queries such as the use of multi-field [Boolean logic](/source/Boolean_logic), while full-text searches do not. "Crawling" (a human by-eye search) is not necessary to find information stored in a database because the data is already structured. [Indexing](/source/index_(database)) the data allows for faster searches.

Database search engines are usually included with major database software products.

== Applications ==

Database search technology is used by large public and private entities including government database services, e-commerce companies, online advertising platforms, telecommunications service providers and other consumers with a need to access information in large repositories.

==See also==

*[Outline of search engines](/source/Outline_of_search_engines)
*[List of search engines](/source/List_of_search_engines)

==External links==
* [http://www.searchtools.com/info/database-search.html Searching for Text Information in Databases]

{{DEFAULTSORT:Search Engine Technology}}
Category:Information retrieval systems

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Adapted from the Wikipedia article [Database search engine](https://en.wikipedia.org/wiki/Database_search_engine) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Database_search_engine?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.