Cov txheej txheem:
Video: Dab tsi yog cov ntaub ntawv warehouse nta?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Data Warehouse suav nrog cov hauv qab no nta : Tam sim no thiab keeb kwm configuration thiab cov khoom muag cov ntaub ntawv uas tso cai rau koj los tsim cov ntawv tshaj tawm muaj txiaj ntsig zoo rau kev kwv yees thiab kev npaj. Muaj ntau ntau yam keeb kwm cov ntaub ntawv marts thiab ib qho khoom muag tam sim no nkaus xwb cov ntaub ntawv mart.
Ntxiv mus, dab tsi yog qhov haujlwm ntawm lub tsev khaws ntaub ntawv?
Cov ntaub ntawv khaws cia muaj 2 lub ntsiab muaj nuj nqi . Thawj muaj nuj nqi yog los ua ke cov ntaub ntawv / cov ntaub ntawv los ntawm txawv cov ntaub ntawv qhov chaw. Qhov thib ob muaj nuj nqi yog cais cov cov ntaub ntawv nyob hauv cov ntaub ntawv qhov chaw los ntawm cov ntaub ntawv hauv qhov tseeb cov ntaub ntawv warehouse , uas yog siv rau kev tshaj tawm thiab cov ntaub ntawv tsom xam."
Tsis tas li ntawd, dab tsi yog txhais los ntawm cov ntaub ntawv warehousing? 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.
Kuj Paub, plaub yam ntxwv ntawm lub tsev khaws ntaub ntawv yog dab tsi?
Hauv qab no yog cov yam ntxwv tseem ceeb ntawm cov ntaub ntawv warehouse:
- Subject-oriented - Lub tsev khaws ntaub ntawv cov ntaub ntawv yeej ib txwm yog cov ncauj lus qhia raws li nws xa cov ntaub ntawv hais txog lub ntsiab lus tsis yog lub koom haum cov haujlwm tam sim no.
- Integrated -
- Sijhawm-Variant -
- Tsis-Volatile -
Dab tsi ua rau lub tsev khaws ntaub ntawv zoo?
Feem ntau a zoo Kev Tshawb Fawb Kev Lag Luam yog txhawb nqa los ntawm a Data Warehouse . Hauv ib Data Warehouse cov ntaub ntawv yog historized/versioned. Kev ua haujlwm siab (lub sijhawm tsawg kawg) thaum lub sijhawm cov ntaub ntawv nyeem cov haujlwm. Cov ntaub ntawv yog denormalized nyob rau hauv cov txheej txheem nkag ntawm lub Data Warehouse los ntawm txhob txwm tshaj tawm cov kev tswj xyuas redundancy.
Pom 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
Lub rooj twg muaj cov ntaub ntawv ntau yam hauv cov ntaub ntawv warehouse?
Cov ntaub ntawv tseeb muaj ntau cov ntaub ntawv nyob rau hauv cov ntaub ntawv warehouse. Multidimensional database yog siv los txhim kho 'online analytical processing' (OLAP) thiab cov ntaub ntawv warehouse
Ntev npaum li cas cov ntaub ntawv tuaj yeem khaws cia hauv cov ntaub ntawv warehouse?
10 xyoo Yog li ntawd, cov ntaub ntawv khaws cia hauv lub tsev khaws ntaub ntawv li cas? Cov ntaub ntawv yog feem ntau khaws cia rau hauv ib lub tsev khaws ntaub ntawv los ntawm cov txheej txheem rho tawm, hloov pauv thiab thauj khoom (ETL), qhov twg cov ntaub ntawv tau muab rho tawm los ntawm qhov chaw, hloov mus rau qhov zoo cov ntaub ntawv thiab ces loaded rau hauv ib lub tsev khaws khoom .
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