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Presentation federated search Presentation Transcript

  • 1. FederatedFederated Search EnginesSearch EnginesPaper presented at seminar onPaper presented at seminar onSEARCH ENGINES AND DATABASESSEARCH ENGINES AND DATABASESByByMrs. Shakuntala NighotMrs. Shakuntala Nighot2009-20102009-2010SHPT School of Library ScienceS.N.D.T. Women’s UniversityMumbai 400 020Under Guidance ofDr. Sarika Sawant
  • 2. OutlineOutlineDefinition- Federated searchDefinition- Federated searchNeed for Search EnginesNeed for Search EnginesWhat is Deep Web?What is Deep Web?Google search vs. Federated SearchGoogle search vs. Federated SearchNeed For Federated Search EnginesNeed For Federated Search EnginesFeatures, Limitations, Examples of Federated Search EnginesFeatures, Limitations, Examples of Federated Search EnginesCriteria for Selecting Best Federated Search EngineCriteria for Selecting Best Federated Search EngineMetaLib Vs. WebFeat- A comparative StudyMetaLib Vs. WebFeat- A comparative StudyConclusionConclusion2205/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 3. Definition - Federated SearchDefinition - Federated Search““Federated search is the process of performing aFederated search is the process of performing asimultaneous real-time search of multiple diversesimultaneous real-time search of multiple diverseand distributed sources from a single search page,and distributed sources from a single search page,with the federated search engine acting aswith the federated search engine acting asintermediary.”intermediary.” (Lederman, n,d,)(Lederman, n,d,)3305/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 4. Search Engines-NeedSearch Engines-NeedA web search engine is a tool designed to search forA web search engine is a tool designed to search forinformation on wwwinformation on wwwE.g.. Yahoo, GoogleE.g.. Yahoo, GoogleNeed- One needs to refer the catalogue to find toNeed- One needs to refer the catalogue to find toparticular book from the vast collection of the library.particular book from the vast collection of the library.catalogue acts as an important intermediary betweencatalogue acts as an important intermediary betweenlibrary sources and user.library sources and user.Following the same lines, The Search engine helps theFollowing the same lines, The Search engine helps theuser to sift through ocean of knowledge on World Wideuser to sift through ocean of knowledge on World WideWeb and to find the specific information needed.Web and to find the specific information needed.4405/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 5. What is Deep Web?What is Deep Web?5505/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library ScienceDeep Web is part of World Wide Web other than surfaceDeep Web is part of World Wide Web other than surfaceweb which cannot be indexed by common searchweb which cannot be indexed by common searchengines.engines.It is 500 times surface web, Consists of Scholarly andIt is 500 times surface web, Consists of Scholarly andresearch materialresearch materialProviders of such contentProviders of such content ::Database Vendors,Database Vendors,Commercial Publishers of full-text material,Commercial Publishers of full-text material,LibrariesLibrariesRepositoriesRepositories
  • 6. Need for Federated Search EnginesNeed for Federated Search EnginesLibraries/Institutions Procure these databasesLibraries/Institutions Procure these databasesQuery Language, User interface for each of them isQuery Language, User interface for each of them isdifferentdifferentPatrons don’t prefer searching them one by one.Patrons don’t prefer searching them one by one.Federated Search Engines offers single interface toFederated Search Engines offers single interface tosearch across all resourcessearch across all resourcesThey give entry to the deep web while Common SearchThey give entry to the deep web while Common Searchengines Can’tengines Can’t6605/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 7. Google vs. Fed. Search EngineGoogle vs. Fed. Search EngineGoogle periodically visits the sites on its list andGoogle periodically visits the sites on its list andidentifies the new links at those sites. Following thoseidentifies the new links at those sites. Following thoselinks it arrives at new pages where it find more links. Inlinks it arrives at new pages where it find more links. Indoing this, Google discovers sites it didn’t knew tilldoing this, Google discovers sites it didn’t knew tillprevious visits. And add it its databases.previous visits. And add it its databases.Process of going from one page to another and then toProcess of going from one page to another and then toanother is referred to as “crawling,”another is referred to as “crawling,”Deep Web content don’t have such links. Google Can’tDeep Web content don’t have such links. Google Can’tretrieve it.retrieve it.Federated Search Engines are programmed to fill up theFederated Search Engines are programmed to fill up thesearch form for user queries, submit them to varioussearch form for user queries, submit them to variousdeep web resources and to read the results from them.deep web resources and to read the results from them.Google is not designed to fill up search formsGoogle is not designed to fill up search forms7705/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 8. Federated Search Engines-FeaturesFederated Search Engines-FeaturesSaves Time/One Stop ShoppingSaves Time/One Stop ShoppingQuality Results –Authentic sourcesQuality Results –Authentic sourcesMost current ContentMost current ContentAggregation (Helpful Arrangement)Aggregation (Helpful Arrangement)Relevance RankingRelevance RankingDe-duplicationDe-duplicationSimple Search, Advance Search/ LimitersSimple Search, Advance Search/ LimitersClustering/ Subject GroupingClustering/ Subject Grouping 8805/21/1305/21/13SHPT School Of Library ScienceSHPT School Of Library Science
  • 9. Federated Search Engines - LimitationsFederated Search Engines - LimitationsDoesn’t offer native searchDoesn’t offer native searchHard to go deeper in collectionHard to go deeper in collectionSlow in Response TimeSlow in Response TimeComplete de-duping is difficultComplete de-duping is difficultConfiguring For new database- time consumingConfiguring For new database- time consumingChanged database configuration- unsearchableChanged database configuration- unsearchable9905/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 10. Some Federated Search ApplicationsSome Federated Search Applications360 Search360 SearchDeepWebDeepWebLiraryFindLiraryFindMetaLibMetaLibScitopeia.orgScitopeia.orgWebFeatWebFeatWorldWideScienceWorldWideScience101005/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 11. Criteria -Selecting Best FederatedCriteria -Selecting Best FederatedSearch EngineSearch EngineHostingHostingVendor Hosted ModelVendor Hosted ModelLocally Hosted ModelLocally Hosted ModelPricingPricing100% database compatibility100% database compatibilityScreen Scrapping Vs. Native InterfaceScreen Scrapping Vs. Native InterfaceAutomatic 24*7 Monitoring and updatesAutomatic 24*7 Monitoring and updatesCustom User InterfaceCustom User InterfaceQuality of ConnectorsQuality of ConnectorsRelevance RankingRelevance RankingTrialsTrials111105/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science
  • 12. MetaLib Vs WebFeatMetaLib Vs WebFeatWebFeatWebFeat DeepWebDeepWeb121205/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library ScienceCriteria MetaLib Webfeat1 Shows Search Results in2 Consistency in resultsreturned3 No of databases searchedat a time4 Option for “Search AllDatabases”5 One Stop ShoppingMetaLib InterfaceYes; All databaseshave same searchdefault operatorsTenNoNoNative InterfaceNo; All databasessearched has differentdefault operatorsNo LimitYesYes
  • 13. MeaLib Vs. WebFeatMeaLib Vs. WebFeatWebFeatWebFeat DeepWebDeepWeb131305/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library ScienceCriteria MetaLib Webfeat6 Speed of retrieval7 Allows CustomizedGrouping of Databases8 Type of Hosting offered9 At a time SearchingCapacity of SimpleSearch10 Interface Complexity11Sorting of RecordsofferedMoreNoVendor, Local both1 Category of subjectLessBy many ways (Year,relevance etc.)Comparatively LessYesVendorAll CategoriesMoreNo sorting
  • 14. ConclusionConclusionFederated search engines are powerful toolsFederated search engines are powerful toolswhich can create a single gateway linking to thewhich can create a single gateway linking to thescattered information resources, lying even inscattered information resources, lying even inthe deep web.the deep web.It helps users to find high-quality, mostIt helps users to find high-quality, mostcurrent ,more specialized information fromcurrent ,more specialized information fromremote corners of the Internet. Hence it’s a vitalremote corners of the Internet. Hence it’s a vitaltechnology in todays information agetechnology in todays information age141405/21/1305/21/13 SHPT School Of Library ScienceSHPT School Of Library Science