11 Facts About Federated search

1.

Federated search retrieves information from a variety of sources via a search application built on top of one or more search engines.

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2.

Federated search can be used to integrate disparate information resources within a single large organization or for the entire web.

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3.

Federated search, unlike distributed search, requires centralized coordination of the searchable resources.

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4.

Federated search came about to meet the need of searching multiple disparate content sources with one query.

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5.

Documents that are not indexed by Federated search engines create what is known as the deep Web, or invisible Web.

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6.

One of the main challenges of metasearch, is ensuring that the search query is compatible with the component search engines that are being federated and combined.

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7.

For example, if one Federated search engine allows for quoting of exact strings or n-grams and another does not, the query must be translated to be compatible with each Federated search engine.

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8.

One implementation of federated search that has begun to address this issue is WorldWideScience, hosted by the US Department of Energy's Office of Scientific and Technical Information.

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9.

When federated search is performed against secure data sources, the users' credentials must be passed onto each underlying search engine, so that appropriate security is maintained.

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10.

Relevance varies greatly among "federates" in the Federated search, so knowing how to interleave results to show the most relevant is difficult or impossible.

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11.

The federated search must decide when to consider a federate offline, or wait for a slow response.

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