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ID:59006974
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时间:2020-09-26
《结构化非结构化半结构化数据ppt课件.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、StructureofbigdataThestructureofbigdataincludesstructured、semi-structuredandunstructureddata.Whatisstructeddata?Insimpleterms,structureddatameansdatabase.Structureddataisalsocalledrowdata.Itisalogicalrepresentationandimplementationofdatabyatwo-dimensionaltablestructure.Besides,structureddataisstore
2、dandmanagedmainlythroughrelationaldatabases.Forexample,thistableistypicallystructureddata.Whatissemi-structureddata?Semi-structureddataisadatamodelsuitablefordatabaseintegration.Thatmeansthatitissuitedtodescribedatacontainedintwoormoredatabases.Generallyspeaking,semistructureddataisusuallycomposedo
3、fasetofnodesandasetofarcs,andhasarooteddigraphstructure.Forexample,XMLandHTMLdocumentsbelongtosemi-structureddata.XMLisprobablythebestwaytostoresemi-structureddata.YoucansavedifferentcategoriesofinformationindifferentnodesofXML.Whatisunstructureddata?Unstructureddataisirregularorincompletedatastruc
4、ture.Itdoesnothaveapredefineddatamodelanditisnotconvenientfordatatoberepresentedbyadatabasetwo-dimensionallogicaltable.Itistheinformationstoredinthefilesystem,notthedatabase.Itincludesallformatsofofficedocuments,text,pictures,XML,HTML,allkindsofreports,imagesandaudio/videoinformation.Forexample,wei
5、boreviewsaretypicallyunstructureddata.
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