Seeking the Web
As mentioned earlier in this course of instruction, the contentdesbases of data will not appear in a result of SearchEngine. It isbecause the spiders of Search Engine cannot pasou will not go insidethe basic tables of data etn' will not extract the data. When we referto basesde given, we speak about the tables stored in programmestelsthat the access, oracle, the waiter of SQL and the DB2. One aestim�it that the contents on the major Web can be 500 foisplus large thatthe contents provided by search engines.
The other contents not collected by spiders include thetextual onessuch as files of multi-media, the dossiersgraphiques ones, anddocuments in nonstandard formats such as leformat of portable document(pdf).
This aspect of the Web sometimes (however unfortunately) d�sign�sousthe name "of the invisible Web" because the basic contents dedonn�esare "invisible" with the spiders of Search Engine. A autreterme usedfor this phenomenon is "major Web," limiting unemeilleure since thebasic contents of data are �videntavec suitable technology.
By treating the major Web, maintain these points in the spirit:
The information which is likely to be stored in a base dedonn�es is apart of the major Web. This can include degrandes lists of the thingswith a common topic. All annuairesfont left the major Web. Theexamples include the annuairest�l�phoniques ones, lists ofprofessionals such as m�decinsou of lawyers, patents, laws,dedictionnaire definitions, geographical information, articles to selldansun store of Web, etc...
A good subjected directory will bind to the basic sites of data surleWeb. It is because several of these data bases ontdes sites of Web oftheir clean. Directly besides for example, vouspouvez outward journeywith the site and to pass enrevue its datatabase of the currentstories of news. A annuairepeut, therefore, to bind besides to thesite of its section denouvelles. A good directory can be the mostreliable manner dontpour to reach the contents on the major Web.
Sites of Web of the data bases also rechercheablespeuvent to be soughtby the intermediary of the moteursde research. For example, a searchfor Google on "the journauxam�ricains" will seek the site of AJRNewslink, a base dedonn�es of the bonds to the sites of newspaperaround the world.
Many sites of Search Engine and gates commerciauxcomportent the databases rechercheables as a �l�mentde their package of the services.This phenomenon falls under the heading ducontenu convergent,mentioned earlier in this course of instruction.Par example, you canvisit AltaVista and seek desnouvelles, of the charts, work, thebiddings, the articles pourl' purchase, etc, all the things apart fromthe range of a indexrecueilli per spider. As a another example, Googleintegrates desrecherches pdf, of word and other files in its generalservice derecherche
