Database search engine: Difference between revisions

Revision as of 01:08, 23 June 2015

Revision as of 01:09, 23 June 2015

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== Modern search engine components ==

Searching for text-based content in [[databases]] or [[structured data]] formats (such as [[XML]], and [[Comma-separated values|CSV]], etc.) presents special challenges and opportunities which specialized search engines resolve. Databases are slow when solving complex queries which have multiple logical or [[string matching]] arguments. However databases allow logical queries, such as the use of multi-field [[Boolean logic]], while full-text searches do not. "Crawling" (a human by-eye search) is not necessary to find information stored in a database, since the data is already structured, although it is often necessary to index the data in a more compact form that is designed to allow for faster searches.

Database search engines are usually included with major database software products. As such, they are commonly called "indexing engines". However, these indexing engines are relatively limited in their ability to customize indexing formats (such as compounding, normalization, transformation and [[transliteration]].). Usually, they do not provide sophisticated data-matching technology (such as [[string matching]], [[Boolean logic]], algorithmic methods and search scripting).