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数据仓库及应用-数据模型-元数据.ppt

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该【数据仓库及应用-数据模型-元数据】是由【小落意】上传分享，文档一共【28】页，该文档可以免费在线阅读，需要了解更多关于【数据仓库及应用-数据模型-元数据】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。数据仓库及应用-数据模型-元数据
Metadata
'dataaboutdata'.Metadatacontainsinformationonthelocation,thestructure,andmeaningofdata,mappinginformation,andaguidetothealgorithmsusedforsummarizationbetweendetailandsummarydata.
Metadata
Metadatacontainsdetaileddescriptionsofthelocation,structure,andmeaningofdata;keysandindexesofthedata;thealgorithmsandbusinessrulesusedtotransformandsummarizedata.
MetadataisusedthroughouttheDW,fromextractionstagethroughtheaccessstage.
MetadataisusedthroughouttheDW,fromextractionstagethroughtheaccessstage.
Metadata
Metadataanswersthefollowingtypesofquestion:
Whatinformationisavailable,bysubjectarea,andwhendidwestartcollectingthatdata?
Howwasthissummarizationcreated?
Whatqueriesareavailabletoaccessthedata?
Whatbusinessassumptionshavebeenmade?
HowdoIfindthedataIneed?
Howoldisthedata?
Whatdoesthatvaluemean?
Metadata
Metadatacanbeclassifiedinto:
Technicalmetadatathatcontainsinformationaboutdatawarehousedataforusebydatawarehousedesignersandadministratorswhencarryingoutdatawarehousedevelopmentandmanagementtasks.
Businessmetadatacontainsinformationthatgivesusersaneasy-to-understandperspectiveoftheinformationstoredinthedatawarehouse.
Datawarehouseoperationalinformation.
OperationalInformation
Datahistory(snapshots,versions);
Dataownership;
Dataextractaudittrail;
Datausagedata;
Usedbytheload,management,andaccessprocessesforschedulingdataloadsorenduseraccess.
MetadataUsers
ChoosingtheMetadataLocation
Whereitisstoredisproduct-specific,
.
Metadatamaybelocatedonaseparatedatabaseonanothermachine.
TheCorporateDataModel

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