Video: CDX cov ntaub ntawv yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
CDX yog a ntaub ntawv extension rau ib qho index ntaub ntawv hom ntawv siv los ntawm Microsoft Visual FoxPro. CDX stands rau "compound index" Visual FoxPro yog ib qho kev sib raug zoo database nrog cov khoom-oriented programming ib puag ncig uas los nrog cov chav kawm ua ntej sau. FoxPro tseem tuaj yeem txuas rau cov databases xws li SQL Server thiab Oracle.
Kuj paub yog, kuv yuav ua li cas ua si CDX cov ntaub ntawv?
Txhawm rau qhib koj CDX cov ntaub ntawv , koj yuav tau rub tawm Visual Foxpro Index, Active Server Document, MicroStation Cell Library Index, lossis lwm pob software zoo sib xws.
Ib tug kuj nug, dab tsi yog cov ntaub ntawv DBF? DBF yog a ntaub ntawv hom ntawv feem ntau siv los ntawm database software. Cov DBF cov ntaub ntawv hom ntawv keeb kwm los ntawm Ashton-Tate, tab sis nkag siab los ntawm Txoj Cai !, Clipper, FoxPro, Arago, Wordtech, xBase, thiab cov ntaub ntawv zoo sib xws lossis cov khoom lag luam ntsig txog. DBF cov ntaub ntawv tuaj yeem qhib los ntawm Microsoft Excel thiab Microsoft Access.
Hais txog qhov no, FPT cov ntaub ntawv yog dab tsi?
Cov. fpt cov extension feem ntau yog siv los ntawm FileMaker Pro database application. Lwm cov ntaub ntawv siv database kuj siv cov FPT cov ntaub ntawv hom ntawv. Cov no cov ntaub ntawv muaj cov ntawv nyeem uas yog siv los piav txog cov ntaub ntawv, tseem hu ua memo.
Kuv yuav qhib DBF cov ntaub ntawv li cas hauv Windows 7?
Rau qhib a DBF cov ntaub ntawv , nias Cov ntaub ntawv | Qhib ntawv qhia zaub mov (Ctrl-O), los yog nias lub icon sib raug ntawm lub toolbar. Hauv qhib cov ntaub ntawv dialog box xaiv lub ntaub ntawv (s), siv Ctrl thiab ua haujlwm yuam sij rau ntau yam xaiv. Txhua qhib dbf cov ntxiv ib lub tab tshiab nyob rau hauv lub toolbar displaying lub ntaub ntawv npe; nyem lub tab kom pom qhov xav tau ntaub ntawv.
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