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ID:50211070
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时间:2020-03-10
《计算机专业英语 教学课件 作者 霍宏涛 Chapter13.ppt》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、ProfessionalEnglishinComputerFieldChapterThirteenManagementInformationSystem内容正文DataWarehouseDataMining阅读材料OracleDataMiningStepsInvolvedinBuildingaDataWarehouse13-1DataWarehouse1.Definition2.Historyofdatawarehousing3.Componentsofadatawarehouse3.1DataS
2、ources3.2DataTransformationLayer3.3DataWarehouseLayer3.4ReportingLayer3.5MetadataLayer13-1DataWarehouse3.6OperationsLayer3.7OptionalComponents4.AdvantagesofusingdatawarehouseKeyWordsdatawarehouse数据仓库archivev.收集归档normalizationn.规范化entity-relationshipmo
3、del实体联系模型,又称为ER模型denormalizev.反规范化metadatan.元数据datamart数据集市NotesDatawarehousesatthisstageareusedtogenerateactivityortransactionsthatarepassedbackintotheoperationalsystemsforuseinthedailyactivityoftheorganization.在此时期,数据仓库被用来生成动作或事务并传递回业务系统中用于企业的日常工作中。
4、Thesedatawarehouseswereabletobringindatafromarangeofdifferentdatasources,suchasmainframecomputers,minicomputers,aswellaspersonalcomputersandofficeautomationsoftwaresuchasspreadsheet,andintegratethisinformationinasingleplace.这些数据仓库可以从一定范围的数据源(例如大型计算机、微
5、型计算机以及个人计算机和办公自动化软件,如电子表格)中获取数据,并将这些信息集中在一起。13-2DataMining1.WhatisDataMining?2.TheDataMiningProcessKeyWordsdrilldownv.抽取,提取knowledgediscovery知识发现machinelearning机器学习scalabilityn.扩展性,伸缩性relationalalgebra关系代数tuplen.元组tangibleadj.实际的,有形的NotesDataisoftenno
6、isyorincompleteandunlessthisisunderstoodandcorrectedfor,itislikelythatmanyinterestingpatternswillbemissedandthereliabilityofdetectedpatternswillbelow.数据经常有噪声或者不完整,除非被理解并加以修正,否则很多有用的模式会被遗漏,所发现的模式的可靠性也会很低。Dataminingisusedtodiscoverhiddenpatternsandrelat
7、ionshipsinyourdatainordertohelpyoumakebetterbusinessdecisions.数据挖掘被用来发现数据中隐藏的模式和关系,从而帮助你做出更好的商业决策。ReadingMaterial1OracleDataMining1.OverviewofOracleDataMining’sAlgorithms2.OracleDataMining(ODM)ProductReadingMaterial1OracleDataMiningOracleDataMiningC
8、lientViewReadingMaterial2StepsInvolvedinBuildingaDataWarehouse1.BuildingaDataWarehouse2.ExtractingTransactionalData3.TransformingTransactionalData4.CreatingaDimensionalModel5.LoadingtheData6.GeneratingPrecalculatedSummaryValues7.Building(orPur
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