Video: Cov ntaub ntawv database yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A database qhia yog formatted tshwm sim ntawm database cov lus nug thiab muaj cov ntaub ntawv tseem ceeb rau kev txiav txim siab thiab kev tshuaj xyuas. Cov ntawv thov kev lag luam zoo feem ntau muaj cov khoom siv hauv qhia cuab tam; qhov no tsuas yog lub hauv ntej-kawg interface uas hu lossis khiav rov qab-kawg database cov lus nug uas yog formatted rau kev siv yooj yim daim ntawv thov.
Tsuas yog li ntawd, qhov kev tshaj tawm database yog dab tsi?
A database daim ntawv tshaj tawm yog ib daim ntawv qhia tsim los ntawm qhov tseem ceeb ntawm cov ntaub ntawv queried pom rau lub hom phiaj ntawm kev tsom xam, kev tshawb pom cov ntaub ntawv, thiab kev txiav txim siab. Database qhia tuaj yeem tsim los ntawm cov txheej txheem BI tsoos thiab kos BI platforms los ntawm kev hu rau pem hauv ntej mus rau lub backend database.
Daim ntawv qhia database hauv Access yog dab tsi? Tshaj tawm muab ib txoj hauv kev los saib, format, thiab sau cov ntaub ntawv hauv koj lub Microsoft Nkag mus rau database . A qhia muaj cov ntaub ntawv uas yog rub los ntawm cov ntxhuav los yog cov lus nug, nrog rau cov ntaub ntawv uas tau muab khaws cia nrog cov qhia tsim, xws li cov ntawv sau, kab lus, thiab cov duab kos.
Khaws qhov no hauv kev txiav txim siab, dab tsi yog cov ntaub ntawv thiab cov ntawv ceeb toom hauv database?
Cov ntawv yog Input rau cov ntaub ntawv system thiab Tshaj tawm yog cov zis los ntawm qhov system. Daim ntawv sau cov ntaub ntawv tseem ceeb rau ib qho ntawm cov ntaub ntawv database . Ntawd yog, cov ntaub ntawv hais txog ib tus neeg lossis khoom. Ntawm qhov tod tes, Tshaj tawm tuaj yeem sawv cev cov ntaub ntawv, sau los ntawm ntau tshaj ib cov ntaub ntawv.
Daim ntawv qhia nyob rau hauv yog dab tsi?
2. Nrog rau kev lag luam mus rau kev tshawb fawb, a qhia yog cov ntsiab lus luv luv distilled los ntawm cov ntaub ntawv loj dua, npaj rau cov neeg tuaj saib tshwj xeeb. Piv txwv li, qhia yog siv los piav qhia qhov kev tshawb pom ntawm qhov kev sim lossis kev nug. Feem ntau feem ntau qhia yog ua tiav nyob rau hauv ib lo lus processor, tab sis yuav ua tau nyob rau hauv tej ntawv nyeem editor.
Pom zoo:
Cov ntaub ntawv hom thiab cov qauv ntaub ntawv yog dab tsi?
Cov qauv ntaub ntawv yog ib txoj hauv kev piav qhia txog ib txoj hauv kev los npaj cov ntaub ntawv kom ua haujlwm andalogrithms tuaj yeem siv tau yooj yim dua. Ib hom ntaub ntawv piav qhia txog cov ntaub ntawv uas txhua tus sib koom ua ke. Piv txwv li tus lej cov ntaub ntawv hom piav qhia txhua tus lej uas lub khoos phis tawj tuaj yeem ua tau
Dab tsi yog qhov txawv ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb?
Qhov sib txawv loj ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb Ib daim ntawv XML muaj cov ntaub ntawv hais txog kev sib raug zoo ntawm cov ntaub ntawv rau ib leeg nyob rau hauv daim ntawv ntawm hierarchy. Nrog rau tus qauv kev sib raug zoo, tib hom kev sib raug zoo uas tuaj yeem txhais tau yog cov lus niam txiv thiab cov rooj sib raug 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
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