Cov Ntaub Ntawv (DB) tso cai rau koj khaws cov ntaub ntawv ntau yam nyob rau hauv daim ntawv ntawm cov txheej txheem uas muaj txheej txheem lossis cov txheej txheem ncaus rau cov khoom, uas muaj cov ntaub ntawv tsim nyog, pawg ua ke los ntawm cov khoom zoo sib xws lossis cov qauv thiab nkag rau hauv cov hlwb tsim nyog. Muaj ob peb hom ntaub ntawv pov thawj, uas txawv hauv cov qauv thiab hom phiaj ntawm kev siv.
Hierarchical databases
Cov qauv hauv qib hierarchical tau nthuav tawm nyob rau hauv daim ntawv ntawm tus qauv schema uas muaj cov khoom ntawm ntau theem qib koom nrog ib lossis lwm pawg ntawm cov ntaub ntawv. Muaj niam txiv thiab tus me nyuam cov ntsiab lus nyob hauv cov ntaub ntawv, i.e. cov hauv paus ntsiab lus ntawm cov cuab yeej cuab tam thiab pab pawg los ntawm cov hom ntaub ntawv khaws cia tau ua. Tus txheej txheem, lub hauv paus hierarchical yog ntoo ntawm lub hauv paus. Qhov no yog yuav ua li cas XML cov ntaub ntawv thiab Windows lub npe zwm siv.
Piv txwv, muaj cov ntawv sau npe ntawm cov neeg yuav khoom hauv ib lub khw. Txhua tus neeg yuav khoom tshwj xeeb. Yog li, yog tias koj sawv cev rau kev yuav khoom hauv lub khw muag khoom raws li qhov xwm txheej, niam txiv keeb kwm yuav raug qhia hauv ib tus neeg siv khoom tshwj xeeb. Tus me nyuam cov khoom yuav yog cov khoom yuav khoom, uas yuav cuam tshuam nrog txhua tus neeg siv khoom ntiag tug. Yog li, tus neeg yuav khoom Petrov, uas yuav lub DVD player thiab discs nrog zaj duab xis, yuav yog qhov khoom tseem ceeb. Cov neeg uas ua ntawv thiab cov disks yuav cuam tshuam nrog Petrov thiab yuav yog cov me nyuam cov khoom hauv cov chaw khaws ntaub ntawv.
Networked databases
Network cov chaw khaws cia kuj tau tsim raws li kev ua haujlwm ntawm cov thawj coj, tab sis lawv muaj qee qhov sib txawv - txhua tus me nyuam cov ntsiab lus tuaj yeem cuam tshuam nrog ob peb cov ntaub ntawv niam txiv, i.e. cov khoom uas tau nyob sab saud hauv qhov qauv no.
Yog li, txhua lub network database tsuas yog ib qhov nyuaj ntawm cov hierarchical xwb. Qhov tsis zoo ntawm hom no yog qee qhov tsis meej pem thaum khaws cov ntaub ntawv ntau, uas txhaum qhov ua tau zoo ntawm nws siv thaum khaws cov ntaub ntawv feem ntau.
Ib qho piv txwv ntawm lub hauv paus network yog Is Taws Nem, uas muaj ntau cov ntaub ntawv uas muaj ob peb lub ntsiab niam txiv thiab muaj kev cuam tshuam los ntawm hyperlinks, i.e. faib nyob rau hauv tib lub network nkaus xwb.
Tej yam txheeb ze databases
Niaj hnub no cov hom txawb no yog ib qho ntawm qhov dav thiab dav siv vim nws cov qauv. Txhua cov ntaub ntawv nyob rau hauv cov chaw khaws ntaub ntawv yog khaws cia hauv cov lus sib cais, uas yog nkag los ntawm kev nkag mus rau kab, kab ntawv lossis xov tooj ntawm tes ncaj qha lossis siv cov lus nug uas twb muaj lawm lossis cov tswj kev tswj hwm.
Cov theem nyuaj tshaj plaws hauv kev txhim kho ntawm cov lus txheeb ze yog tsim.
Lub rooj qhia cov ntaub ntawv hom, cov kab zauv, cov hlua parameter, ntawv nyeem, thiab lwm yam. Txhua ntawm cov ntsiab lus tuaj yeem nrhiav tau los ntawm cov lus nug tshawb nrhiav, tsis hais tus nqi ntawm cov ntaub ntawv khaws cia, uas ua rau hom no tshwj xeeb tshaj yog thaum ua cov ntaub ntawv khaws cov haujlwm thaum lub sijhawm txhim kho cov chaw lossis cov khw muag ntaub ntawv ntxiv.
