Video: Puas yog ib pawg ntawm cov ntaub ntawv cuam tshuam uas tuaj yeem khaws cia?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov ntaub ntawv redundancy xyuas kom meej tias cov cov ntaub ntawv muaj nyob rau hauv lub database yog qhov tseeb thiab txhim khu kev qha. Me me slices a cov ntaub ntawv mart npe cov ntaub ntawv cov tsev khaws khoom. Ib pawg ntawm cov ntaub ntawv ntsig txog yog hu ua lub rooj.
Qhov sib thooj, puas yog ib pawg ntawm cov ntaub ntawv muaj feem cuam tshuam?
Nyob rau hauv kev sib raug zoo database, a sau cov ntaub ntawv ntsig txog los yog kab. Ib pawg ntawm cov ntaub ntawv yuav tsum tau muab cia rau hauv ib lub database, xws li cov neeg siv khoom npe lossis tus xov tooj ntawm cov neeg ua haujlwm. Kuj hu ua kem.
Ib yam li ntawd, ib pawg ntawm cov ntaub ntawv ntsig txog hu ua dab tsi? A sau tseg yog ib phau ntawm ntsig txog teb. Ib tug neeg ua haujlwm sau tseg tej zaum yuav muaj lub npe teb, chaw nyob, teb hnub yug thiab lwm yam. Ib cov ntaub ntawv yog ib phau ntawm cov ntaub ntawv ntsig txog . Cov ntxhuav kuj yog hu ua cov ntaub ntawv.
Hais txog qhov no, puas yog sau cov ntaub ntawv ntsig txog?
database A sau cov ntaub ntawv ntsig txog uas yog khaws cia rau hauv ib qho kev ua kom cov ntaub ntawv rov qab tau raws li qhov xav tau; nyob rau hauv ib tug relational database, a kev sib sau ua ke rooj. database management system (DBMS) Ib hom software program siv los tsim, tswj, thiab nkag mus rau databases.
Kev sau cov ntaub ntawv muaj feem cuam tshuam yog dab tsi?
Lub database yog ib qho kev npaj kev sib sau ua ke cov ntaub ntawv. Relational databases yog hom kev siv ntau tshaj plaws ntawm cov ntaub ntawv, qhov twg cov ntaub ntawv yog tsim rau hauv cov rooj thiab txhua lub rooj yuav tsum yog ntsig txog rau ib leeg los ntawm cov cim tshwj xeeb.
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
Dab tsi yog cov ntaub ntawv hloov pauv hauv cov ntaub ntawv khaws cia?
Cov ntaub ntawv hloov pauv yog cov ntaub ntawv uas tau tsim nyob rau hauv daim ntawv thov kev sib ntsib, uas tsis tau khaws cia hauv cov ntaub ntawv tom qab daim ntawv thov raug txiav
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
Cov ntaub ntawv xov tooj puas tuaj yeem cuam tshuam lub roj teeb lub neej?
Raws li Apple, txhua yam tuaj yeem poob rau koj iPhonecase. Lub smartphone loj reckons qee qhov teeb meem tsim hluav taws xob ntau dhau, koj pom. Qhov no, nyob rau hauv lem, tuaj yeem cuam tshuam lub peev xwm ntawm lub roj teeb. Yog tias koj pom tias koj lub cuab yeej kub thaum koj them nws, tshem tawm ntawm rooj plaub