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. 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. In more advanced Database search systems relational databases are indexed by compounding multiple tables into a single table containing only the fields that need to be queried (or displayed in search results). See also[edit] External links[edit]

Recommended Gateway Sites for the Deep Web Recommended Gateway Sites for the Deep Web And Specialized and Limited-Area Search Engines This portion of the Internet consists of information that requires interaction to display such as dynamically-created pages, real-time information and databases. Currently estimated to be over 100 times larger than the surface web, the Deep Web houses billions of documents in databases and other sources, over 95% of which are available to the public. General Gateways | Humanities | Social Sciences Science and Technology | Health Sciences Business and Government | Reference, Popular Culture | Other General Gateways: Invisible Web Directory (highly recommended) An excellent gateway to some of the best research-oriented invisible web resources available. Resource Discovery Network A well-annotated listing of Deep Web resources. ALTIS - Hospitality, Leisure, Sport and Tourism Artifact - Arts and Creative Industries BIOME - Health and Life Sciences Other:

10 Search Engines to Explore the Invisible Web Not everything on the web will show up in a list of search results on Google or Bing; there are lots of places that their web crawlers cannot access. To explore the invisible web, you need to use specialist search engines. Here are our top 12 services to perform a deep internet search. What Is the Invisible Web? Before we begin, let's establish what does the term "invisible web" refer to? Simply, it's a catch-all term for online content that will not appear in search results or web directories. There are no official data available, but most experts agree that the invisible web is several times larger than the visible web. The content on the invisible web can be roughly divided into the deep web and the dark web. The Deep Web The deep web made up of content that typically needs some form of accreditation to access. If you have the correct details, you can access the content through a regular web browser. The Dark Web The dark web is a sub-section of the deep web. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

The Best Reference Sites Whether you're looking for the average rainfall in the Amazon rainforest, researching Roman history, or just having fun learning to find information, you'll get some great help using my list of the best research and reference sites on the Web. About.com: I've found many answers to some pretty obscure questions right here at About.Reference.com.Extremely simple to use, very basically laid out.Refdesk.com.Includes in-depth research links to breaking news, Word of the Day,and Daily Pictures. A fun site with a ton of information.Encyclopedia.com. As stated on their site, Encyclopedia.com provides users with more than 57,000 frequently updated articles from the Columbia Encyclopedia, Sixth Edition.Encyclopedia Brittanica.