Database search engine There are several categories of search engine software: Web search or full-text search (example: Lucene), database or structured data search (example: Dieselpoint), and mixed or enterprise search (example: Google Search Appliance). The largest web search engines such as Google and Yahoo! utilize tens or hundreds of thousands of computers to process billions of web pages and return results for thousands of searches per second. High volume of queries and text processing requires the software to run in highly distributed environment with high degree of redundancy. Modern search engines have the following main components: Searching for text-based content in databases or other structured data formats (XML, CSV, etc.) presents some special challenges and opportunities which a number of specialized search engines resolve. Database search engines were initially (and still usually are) included with major database software products. See also External links
List of academic databases and search engines This page contains a representative list of major databases and search engines useful in an academic setting for finding and accessing articles in academic journals, institutional repositories, archives, or other collections of scientific and other articles. As the distinction between a database and a search engine is unclear for these complex document retrieval systems, see: the general list of search engines for all-purpose search engines that can be used for academic purposesthe article about bibliographic databases for information about databases giving bibliographic information about finding books and journal articles. Note that "free" or "subscription" can refer both to the availability of the database or of the journal articles included. This has been indicated as precisely as possible in the lists below. See also References ^ "List of EBSCO databases".
100 Useful Tips and Tools to Research the Deep Web By Alisa Miller Experts say that typical search engines like Yahoo! and Google only pick up about 1% of the information available on the Internet. The rest of that information is considered to be hidden in the deep web, also referred to as the invisible web. So how can you find all the rest of this information? Meta-Search Engines Meta-search engines use the resources of many different search engines to gather the most results possible. SurfWax. Semantic Search Tools and Databases Semantic search tools depend on replicating the way the human brain thinks and categorizes information to ensure more relevant searches. Hakia. General Search Engines and Databases These databases and search engines for databases will provide information from places on the Internet most typical search engines cannot. DeepDyve. Academic Search Engines and Databases The world of academia has many databases not accessible by Google and Yahoo! Google Scholar. Scientific Search Engines and Databases Science.gov.
99 Resources to Research & Mine the Invisible Web College researchers often need more than Google and Wikipedia to get the job done. To find what you're looking for, it may be necessary to tap into the invisible web, the sites that don't get indexed by broad search engines. The following resources were designed to help you do just that, offering specialized search engines, directories, and more places to find the complex and obscure. Search Engines Whether you're looking for specific science research or business data, these search engines will point you in the right direction. Turbo10: On Turbo10, you'll be able to search more than 800 deep web search engines at a time. Databases Tap into these databases to access government information, business data, demographics, and beyond. GPOAccess: If you're looking for US government information, tap into this tool that searches multiple databases at a time. Catalogs If you're looking for something specific, but just don't know where to find it, these catalogs will offer some assistance. Directories
Deep Web From Wikipedia, the free encyclopedia (Redirected from Deep Web) Deep Web may refer to: Business Solutions & Software for Legal, Education and Government | LexisNexis ERIC – World’s largest digital library of education literature The Invisible Web What is the Invisible Web? How can you find it online? What makes the Invisible Web search engines and Invisible Web databases so special? How to Mine the Invisible Web: The Ultimate GuideThe Invisible Web is a mammoth resource that is mostly untapped. Invisible Web People SearchThe Invisible Web is a goldmine of information, and since the Invisible Web is larger by far than the parts of the Web we can access with a simple search engine query, there's potentially much more information available. Five Search Engines You Can Use to Search the Invisible WebUnlike pages on the visible Web (that is, the Web that you can access from search engines and directories), information in the Invisible Web is just not visible to the software spiders and crawlers that create search engine indexes. The Invisible Web: How to Find It. Medical Information on the Invisible WebLearn how to find medical information on the Invisible Web. How big is the Invisible Web?