资源描述:
《毕业设计(论文)外文翻译(原文).doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、毕业设计(论文)——外文翻译(原文)NEWAPPLICATIONOFDATABASERelationaldatabaseshavebeeninuseforovertwodecades.Alargeportionoftheapplicationsofrelationaldatabaseshavebeeninthecommercialworld,supportingsuchtasksastransactionprocessingforbanksandstockexchanges,salesandreservationsforavarietyofbusinesses,a
2、ndinventoryandpayrollforalmostofallcompanies.Westudyseveralnewapplications,whichhavebecomeincreasinglyimportantinrecentyears.First.Decision-supportsystemAstheonlineavailabilityofdatahasgrown,businesseshavebeguntoexploittheavailabledatatomakebetterdecisionsaboutincreasesales.Wecanextra
3、ctmuchinformationfordecisionsupportbyusingsimpleSQLqueries.Recentlyhowever,peoplehavefelttheneedforbetterdecisionsupportbasedondataanalysisanddatamining,orknowledgediscovery,usingdatafromavarietyofsources.Databaseapplicationscanbebroadlyclassifiedintotransactionprocessinganddecisionsu
4、pport.Transaction-processingsystemsarewidelyusedtoday,andcompanieshaveaccumulatedavastamountofinformationgeneratedbythesesystems.Thetermdataminingreferslooselytofindingrelevantinformation,or“discoveringknowledge,”fromalargevolumeofdata.Likeknowledgediscoveryinartificialintelligence,da
5、taminingattemptstodiscoverstatisticalrulesandpatternsautomaticallyfromdata.However,dataminingdiffersfrommachinelearninginthatitdealswithlargevolumesofdata,storedprimarilyondisk.Knowledgediscoveredfromadatabasecanberepresentedbyasetofrules.Wecandiscoverrulesfromdatabaseusingoneoftwomod
6、els:Inthefirstmodel,theuserisinvolveddirectlyintheprocessofknowledgediscovery.Inthesecondmodel,thesystemisresponsibleforautomaticallydiscoveringknowledgefromthedatabase,bydetectingpatternsandcorrelationsinthedata.Workonautomaticdiscoveryofruleshasbeeninfluencedstronglybyworkintheartif
7、icial-intelligencecommunityonmachinelearning.Themaindifferenceslieinthevolumeofdatahandledindatabases,andintheneedtoaccessdisk.Specializeddata-miningalgorithmshavebeendevelopedtohandlelargevolumesofdisk-residentdataefficiently.Themannerinwhichrulesarediscovereddependsontheclassofdata-
8、minin