Video: Nws txhais li cas rau cov ntaub ntawv theem?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A theem thaj chaw, lossis thaj chaw tsaws, yog thaj chaw cia nruab nrab siv rau cov ntaub ntawv Kev ua haujlwm thaum lub sijhawm rho tawm, hloov pauv thiab thauj khoom (ETL) txheej txheem. Cov data theem cheeb tsam zaum ntawm lub cov ntaub ntawv source(s) thiab cov ntaub ntawv hom phiaj (s), uas feem ntau cov ntaub ntawv warehouses, cov ntaub ntawv marts, los yog lwm yam cov ntaub ntawv chaw khaws cia.
Tib neeg kuj nug, cov ntaub ntawv staging txhais li cas?
A data theem cheeb tsam (DSA) yog ib ntus cia chaw nruab nrab ntawm lub cov ntaub ntawv qhov chaw thiab a cov ntaub ntawv lub tsev khaws khoom. Cov theem cheeb tsam yog feem ntau yog siv los sai sai extract cov ntaub ntawv los ntawm nws cov ntaub ntawv qhov chaw, txo qhov cuam tshuam ntawm qhov chaw. Hauv TX koj tsis tuaj yeem thauj khoom ncaj qha ntawm cov ntaub ntawv qhov chaw thiab a cov ntaub ntawv lub tsev khaws khoom.
Qhov thib ob, lub rooj sib tham yog dab tsi? staging rooj tsuas yog database rooj muaj koj cov ntaub ntawv ua lag luam nyob rau hauv qee daim ntawv lossis lwm yam. Staging yog cov txheej txheem ntawm kev npaj koj cov ntaub ntawv ua lag luam, feem ntau yog coj los ntawm qee daim ntawv thov kev lag luam. Rau koj qhov nruab nrab BI system koj yuav tsum npaj cov ntaub ntawv ua ntej thauj khoom.
Tsis tas li ntawd, vim li cas peb thiaj xav tau cov rooj sib tham?
Staging rooj txuas nrog rau thaj chaw ua haujlwm lossis qhov tseeb rooj . Peb hauv paus xav tau staging thaj chaw tuav cov ntaub ntawv, thiab ua cov ntaub ntawv ntxuav thiab sib koom ua ke, ua ntej thauj cov ntaub ntawv mus rau hauv lub tsev khaws khoom. Kev ntxuav cov ntaub ntawv, tseem hu ua cov ntaub ntawv scrubbing, yog cov txheej txheem los xyuas kom meej tias cov txheej txheem ntawm cov ntaub ntawv raug thiab raug.
Dab tsi yog staging database hauv SQL Server?
SQL Server Parallel Data Warehouse (PDW) siv a theem database khaws cov ntaub ntawv ib ntus thaum lub sijhawm thauj khoom. Los ntawm lub neej ntawd, SQL Server PDW siv qhov chaw database raws li cov theem database , uas tuaj yeem ua rau lub rooj fragmentation. Txhawm rau txo cov lus fragmentation, koj tuaj yeem tsim tus neeg siv txhais tau tias theem database.
Pom zoo:
Nws txhais li cas rau flatten cov ntaub ntawv?
Flattening cov ntaub ntawv nyob rau hauv ib lub database txhais tau hais tias koj khaws nws nyob rau hauv ib los yog ob peb lub rooj uas muaj tag nrho cov ntaub ntawv, nrog me ntsis kev tswj ntawm cov qauv. Hauv database lingo, uas yog hu ua denormalized schema
Kuv yuav hloov cov ntaub ntawv tab delimited rau cov ntaub ntawv csv li cas?
Mus rau cov ntawv qhia zaub mov, xaiv 'OpenCSVTab-Delimited File' (lossis tsuas yog nias Ctrl + O), thiab tom qab ntawd los ntawm lub thawv qhib, xaiv cov ntaub ntawv tab-delimited qhib. Koj tuaj yeem luam cov tab-delimited txoj hlua mus rau clipboard thiab tom qab ntawd siv 'Qhib Cov Ntawv Hauv Cov Ntawv Teev Npe' xaiv (Ctrl + F7)
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
Yuav ua li cas rau txim nyob rau hauv Is Nrias teb rau nyiag computer cov ntaub ntawv cov cuab tam los yog tej software qhov chaw code los ntawm ib tug neeg lub koom haum los yog los ntawm lwm yam txhais tau tias?
Kev piav qhia: Kev rau txim hauv Is Nrias teb rau kev nyiag cov ntaub ntawv hauv computer, cov khoom muaj nqis lossis ib qho software cov cai los ntawm ib lub koom haum, ib tus neeg, lossis los ntawm lwm txoj kev yog raug kaw 3 xyoo thiab raug nplua ntawm Rs. 500,000
Vim li cas cov ntaub ntawv zoo tseem ceeb heev rau kev sau cov ntaub ntawv txheeb cais?
Cov ntaub ntawv muaj txiaj ntsig zoo yuav ua kom muaj txiaj ntsig ntau dua hauv kev tsav lub tuam txhab kev vam meej vim yog kev vam khom ntawm qhov tseeb-raws li kev txiav txim siab, tsis yog kev coj cwj pwm lossis tib neeg kev xav. Ua kom tiav: Xyuas kom tsis muaj qhov khoob ntawm cov ntaub ntawv los ntawm qhov yuav tsum tau sau thiab qhov twg tau sau tiag