Cov txheej txheem:

Koj ua ETL li cas?
Koj ua ETL li cas?

Video: Koj ua ETL li cas?

Video: Koj ua ETL li cas?
Video: Ua li cas by DeathRhyme 2024, Hlis ntuj nqeg
Anonim

Nov yog qee cov kauj ruam tseem ceeb uas koj xav ua

  1. Txheeb xyuas qhov chaw cov ntaub ntawv.
  2. Txheeb xyuas qhov chaw cov ntaub ntawv.
  3. Xaiv lub tsev khaws ntaub ntawv.
  4. Xaiv ib ETL (Extract, Hloov, Load) cuab tam.
  5. Tsim cov ntaub ntawv warehouse tables thiab pipelines.
  6. Tshawb xyuas lossis pom cov ntaub ntawv.

Ntxiv rau qhov no, cov txheej txheem ETL ua haujlwm li cas?

ETL yog luv luv rau extract, transform, load, peb database functions uas yog ua ke rau hauv ib lub cuab tam los rub cov ntaub ntawv tawm ntawm ib tug database thiab muab tso rau hauv lwm database. Kev hloov pauv tshwm sim los ntawm kev siv cov cai lossis saib cov lus lossis los ntawm kev sib txuas cov ntaub ntawv nrog lwm cov ntaub ntawv.

SQL yog ib qho cuab yeej ETL? SQL ntawv yog ib hom lus rau querying databases. ETL yog ib txoj hauv kev los thauj cov ntaub ntawv mus rau hauv cov ntaub ntawv, thiab ua kom nws ua tau raws li cov lus nug. Feem ntau ETL cov cuab yeej hloov cov ntaub ntawv hauv lawv tus kheej toolset. Ib tug variant ntawm ETL hu ua ELT (extract-load-transform) siv SQL ntawv los cuam tshuam nws transformations.

Piv txwv li, ETL txheej txheem yog dab tsi?

ETL Nyob rau hauv cov ntaub ntawv warehousing: Feem ntau piv txwv ntawm ETL yog ETL yog siv nyob rau hauv cov ntaub ntawv warehousing. Nws cov ntaub ntawv qhov chaw yuav txawv. Tus neeg siv yuav tsum tau nqa cov ntaub ntawv los ntawm ntau lub tshuab heterogeneous thiab thauj mus rau hauv ib lub hom phiaj uas tseem hu ua cov ntaub ntawv warehouse.

ETL workflow yog dab tsi?

Ib ETL kev ua haujlwm Nws yog lub luag haujlwm rau kev rho tawm cov ntaub ntawv los ntawm cov kab ke, lawv ntxuav, hloov pauv, thiab thauj khoom mus rau hauv lub hom phiaj cov ntaub ntawv warehouse. Muaj cov txheej txheem raug cai uas twb muaj lawm los ua qauv qauv ntawm cov txheej txheem los yog cov ntaub ntawv xws li daim duab qhia kev sib raug zoo (ERD).

Pom zoo: