Searching the invisible web (deep web, hidden web): WebLens sear Custom Search Locate deepweb resources by adding the word database to a regular search engine query. The terms invisible web, hidden web, and deep web all refer to the same thing: a massive storehouse of online data that regular search engines don't capture. That's because terabytes of information are buried in databases and other research resources. Need a grammar or usage tune-up for that report, essay, or homework assignment?
Distributed web crawling Distributed web crawling is a distributed computing technique whereby Internet search engines employ many computers to index the Internet via web crawling. Such systems may allow for users to voluntarily offer their own computing and bandwidth resources towards crawling web pages. By spreading the load of these tasks across many computers, costs that would otherwise be spent on maintaining large computing clusters are avoided. Types Cho and Garcia-Molina studied two types of policies: Dynamic assignment With this type of policy, a central server assigns new URLs to different crawlers dynamically. With dynamic assignment, typically the systems can also add or remove downloader processes. There are two configurations of crawling architectures with dynamic assignments that have been described by Shkapenyuk and Suel: Static assignment Implementations As of 2003 most modern commercial search engines use this technique. Drawbacks See also Sources
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? Find out the answers to these questions and learn more about this section of the Web that's so much larger than what you can uncover with an ordinary Web search. 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.
So, You Want A Searchable Database, Huh? - www.htmlgoodies.com Use these to jump around or read it all... [Search Someone Else's Database] [But I Want To Search MY Site!] [Goodies Search -- Java-Driven Search Engine] [Use AltaVista or HotBot] I am asked this question time and time again, "How do I set up a searchable database?" There are actually a few different ways -- some are harder than others. Here's a quick look at the three main ways. Search Someone Else's Database Ever been into a page and the author invites you to search Yahoo or Webcrawler right from his or her own page? Search Excite Here: Search Webcrawler Here: Search Yahoo Here: Go ahead, enter a word -- nothing dirty, mind you! ...waiting ...waiting ...waiting Ah, good. How I Did It Let's look at the code I used to create the Yahoo search above: Notice it's a simple set of form commands, set up much like you would to create a link button or a simple mailto: guestbook. Here are the Webcrawler and Excite lines from above: Notice they also sent the output of the text box to a search engine. Huh?
Nonprofit Common Crawl Offers a Database of the Entire Web, For Free, and Could Open Up Google to New Competition Google famously started out as little more than a more efficient algorithm for ranking Web pages. But the company also built its success on crawling the Web—using software that visits every page in order to build up a vast index of online content. A nonprofit called Common Crawl is now using its own Web crawler and making a giant copy of the Web that it makes accessible to anyone. The organization offers up over five billion Web pages, available for free so that researchers and entrepreneurs can try things otherwise possible only for those with access to resources on the scale of Google’s. “The Web represents, as far as I know, the largest accumulation of knowledge, and there’s so much you can build on top,” says entrepreneur Gilad Elbaz, who founded Common Crawl. New search engines are just one of the things that can be built using an index of the Web, says Elbaz, who points out that Google’s translation software was trained using online text available in multiple languages.
DeepDyve Explores The Invisible Web As web search engines have improved over the years, there’s been less attention paid to an “inconvenient truth” about the indexes of our favorite information finding tools—namely, that search engines still miss the lion’s share of information available on the web. This so-called “deep web” remains largely impenetrable to search engines for a variety of reasons, and for many types of queries that’s just fine. But if you’re a serious searcher, looking for the best information possible, you can’t afford to overlook this vast “hidden” store of information. And that’s a challenge, because search tools that probe the deep web are for the most part either obscure or fee-based. That’s changing, thanks to a company formerly known as Infovell and now called DeepDyve. DeepDyve’s approach is like no other I’ve seen. DeepDyve takes a similar approach to understanding information on the web. DeepDyve isn’t a threat to Google now or likely any time in the future.
JournalSeek - A Searchable Database of Online Scholarly Journals DataparkSearch Engine - an open source search engine Research Beyond Google: 119 Authoritative, Invisible, and Compre Got a research paper or thesis to write for school or an online class? Want to research using the Internet? Good luck. There’s a lot of junk out there — outdated pages, broken links, and inaccurate information. Using Google or Wikipedia may lead you to some results, but you can’t always be sure of accuracy. And what’s more, you’ll only be searching a fraction of all of the resources available to you. Google, the largest search database on the planet, currently has around 50 billion web pages indexed. Do you think your local or university librarian uses Google? Topics Covered in this Article Deep Web Search Engines | Art | Books Online | Business | Consumer | Economic and Job Data | Finance and Investing | General Research | Government Data | International | Law and Politics | Library of Congress | Medical and Health | STEM | Transportation Deep Web Search Engines To get started, try using a search engine that specializes in scouring the invisible web for results. Art Books Online Business
All Music, All But Invisible - Search Engine Watch (SEW) The All Music Guide is one of the most comprehensive, extensively cross-linked and easy to use musical resources on the web. It's also, unfortunately, largely invisible to search engines. If you're looking for music information, the All Music Guide is an exceptional resource, packed with high quality information that's difficult to find elsewhere. The All Music Guide is known for its extensive, detailed, and critical biographies of thousands of performers, as well as thorough discographies. This information alone makes it one of the most comprehensive, authoritative sources for music information on the web. The site designers took full advantage of the interactive capabilities of database technology. Unfortunately, this type of database technology presents one of the thorniest challenges to search engines. The main search box atop every page allows you to search by artist, album, song, style or label. Results for artist search presents a list of artists with names similar to your query.
The Complete Idiot’s Guides WebLens Custom Search Narrow results by making your query words a phrase. To do this, enclose them in double quotation marks, as in "grand canyon tours". For details, see Search Basics. Search engines are giant databases of words, compiled and maintained around the clock by small computer programs called spiders, bots, or robots. Reminder: There's more to search than Google! Search Engines GoogleBingYahooDuck Duck GoAskJeevesMahaloIXQuickGigaBlastTeoma (good for jumplists)AOL LycosMasterSite Paid Listings Internet Search engines like Google and Bing use a variety of criteria to order results, including popularity and relevance. OvertureKanoodle
99 Resources to Research & Mine the Invisible Web - College Degr 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