Video: Dab tsi yog qhov cubes hauv cov ntaub ntawv warehousing?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Kub yog cov ntaub ntawv cov chav ua haujlwm muaj li ntawm cov lus tseeb thiab qhov ntev los ntawm cov ntaub ntawv warehouse . Lawv muab multidimensional views ntawm cov ntaub ntawv , querying thiab analytical muaj peev xwm rau cov neeg siv khoom. A kub tuaj yeem khaws cia rau ntawm ib qho kev txheeb xyuas server thiab tom qab ntawd txhais tau tias yog qhov txuas kub ntawm lwm cov kev ntsuam xyuas servers.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog cubes nyob rau hauv database?
Ib OLAP kub yog multidimensional database uas yog optimized rau cov ntaub ntawv warehouse thiab online analytical processing (OLAP) daim ntaub ntawv. Hauv OLAP kub , cov ntaub ntawv (kev ntsuas) yog categorized los ntawm qhov ntev. OLAP kub feem ntau ua ntej sau los ntawm qhov ntev kom ua tau zoo dua cov lus nug lub sij hawm dhau kev sib txheeb databases.
Ib yam li ntawd, cov ntaub ntawv lub voos xwmfab ua haujlwm li cas? A data kub tsim los npaj cov cov ntaub ntawv los ntawm pawg nws mus rau hauv qhov sib txawv, indexing cov cov ntaub ntawv , thiab precomputing queries nquag. Vim tag nrho cov cov ntaub ntawv yog indexed thiab precomputed, a data kub Cov lus nug feem ntau khiav nrawm dua li cov lus nug SQL tus qauv.
cubes hauv SQL yog dab tsi?
Ib qho OLAP (Online analytical processing) kub yog cov qauv ntaub ntawv uas tso cai rau kev soj ntsuam ceev ntawm cov ntaub ntawv. Nws tseem tuaj yeem txhais tau tias yog lub peev xwm ntawm kev tswj hwm thiab tshuaj xyuas cov ntaub ntawv los ntawm ntau qhov kev xav. Kev npaj cov ntaub ntawv rau hauv kub overcomes qee qhov kev txwv ntawm kev sib txheeb databases.
Dab tsi yog txhais los ntawm kev khaws cov ntaub ntawv?
A Cov ntaub ntawv khaws cia (DW) yog txheej txheem rau kev sau thiab tswj cov ntaub ntawv los ntawm ntau qhov chaw los muab kev nkag siab txog kev lag luam muaj txiaj ntsig. Nws yog hluav taws xob cia ntawm cov ntaub ntawv ntau los ntawm ib lub lag luam uas yog tsim los rau kev nug thiab kev tshuaj xyuas es tsis txhob ua lag luam.
Pom zoo:
Dab tsi yog qhov txawv ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb?
Qhov sib txawv loj ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb Ib daim ntawv XML muaj cov ntaub ntawv hais txog kev sib raug zoo ntawm cov ntaub ntawv rau ib leeg nyob rau hauv daim ntawv ntawm hierarchy. Nrog rau tus qauv kev sib raug zoo, tib hom kev sib raug zoo uas tuaj yeem txhais tau yog cov lus niam txiv thiab cov rooj sib raug zoo
Dab tsi yog qhov sib txawv ntawm pab pawg cov ntaub ntawv thiab cov ntaub ntawv tsis yog pawg?
Ob leeg yog cov ntaub ntawv muaj txiaj ntsig ntawm cov ntaub ntawv tab sis qhov sib txawv ntawm lawv yog cov ntaub ntawv tsis muaj ntaub ntawv yog rawdata. Qhov no txhais tau hais tias nws nyuam qhuav tau sau tab sis tsis txheeb rau hauv ib pawg lossis cov chav kawm. Ntawm qhov tod tes, groupeddata yog cov ntaub ntawv uas tau teeb tsa ua pawg los ntawm cov ntaub ntawv nyoos
Dab tsi yog qhov sib txawv ntawm cov ntaub ntawv hauv cov ntaub ntawv mining?
Cia peb tham txog yam ntaub ntawv twg tuaj yeem raug mined: Cov ntaub ntawv tiaj tus. Relational Databases. DataWarehouse. Transactional Databases. Multimedia Databases. Spatial Databases. Lub Sijhawm Series Databases. World Wide Web (WWW)
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi yog cov teeb meem ntawm kev tswj cov ntaub ntawv hauv cov ntaub ntawv ib txwm muaj?
Nyob rau tib lub sijhawm, qhov kev tswj hwm cov ntaub ntawv ib puag ncig tsim teeb meem xws li cov ntaub ntawv rov ua dua thiab tsis sib xws, cov kev pab cuam-cov ntaub ntawv dependence, inflexibility, tsis muaj kev ruaj ntseg, thiab tsis muaj cov ntaub ntawv sib qhia thiab muaj