Yog li ntawd, kev hloov kho cov lus tseeb yog qhov kev daws sai, yooj yim, thiab pom tseeb. Tab sis vim hais tias cov shortcuts no tuaj yeem "ua haujlwm" tsis tau txhais hais tias cov txheej txheem no yog qhov kev coj ua zoo tshaj plaws. Txawm hais tias koj qhov xwm txheej yuav ua rau koj ntseeg tias yuav tsum tau ua kom hloov kho tshiab, tsis txhob hnov qab tias kev hloov kho tshiab yog qhov zoo tshaj plaws.
Vim li cas thiaj xav tau lub rooj tseeb?
Lub Sijhawm Snapshot Fact tables yog siv los soj ntsuam sai thiab tshuaj xyuas qhov kev ua tau zoo ntawm kev ntsuas nyob rau lub sijhawm teem sijhawm (lub limtiam, hli, quarter, xyoo, thiab lwm yam).
Yuav tsum yog dab tsi hauv lub rooj tseeb?
Hauv cov ntaub ntawv khaws cia, lub rooj qhov tseeb muaj qhov ntsuas, ntsuas lossis qhov tseeb ntawm cov txheej txheem lag luamNws nyob ntawm qhov nruab nrab ntawm lub hnub qub schema lossis snowflake schema ncig los ntawm Dimension rooj.… Lub ntsiab tseem ceeb ntawm lub rooj qhov tseeb feem ntau yog ib qho yuam sij sib xyaw uas yog tsim los ntawm tag nrho nws cov yuam sij txawv teb chaws.
Puas hnub qub schemas tseem cuam tshuam?
Lub hnub qub schema tseem cuam tshuam txawm tias koj cov ntaub ntawv loj npaum li cas, txawm tias cov ntaub ntawv me me yog qhov ntau tshaj thaum nws los txog rau lub hnub qub schema qauv. Kev nkag tau yooj yim los nug cov ntaub ntawv rau qhov tseeb thiab qhov ntev yog qhov nkag siab thiab siv sijhawm ntev.
Puas yog cov lus tseeb tag nrho Denormalized?
Fact cov lus tau ua tiav tag nrho kom tau txais cov ntaub ntawv xov xwm hais txog kev hloov pauv (txhua cov ntaub ntawv hauv cov lus tseeb), koj yuav tsum koom nrog lub rooj tseeb nrog lub rooj dimension. Ib txhia hais tias cov lus tseeb nyob rau hauv cov qauv denormalized vim nws yuav muaj cov yuam sij txawv teb chaws.
