Video: Lub npe loj ntawm cov ntaub ntawv ntsig txog hu ua dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov sau ntawm cov ntaub ntawv yog hu ua ib database.
Yog li ntawd, dab tsi yog ib phau ntawm cov ntaub ntawv ntsig txog hu ua?
Teb. A kev sib sau ua ke cov ntaub ntawv hauv database yog hu ua a ntaub ntawv.
Tom qab, lo lus nug yog, cov ntaub ntawv database yog dab tsi? Koj muaj peev xwm xav txog ib txwm database raws li ib tug electronic filing system, npaj los ntawm teb, cov ntaub ntawv, thiab cov ntaub ntawv. Ib daim teb yog ib daim ntawv qhia; cov ntaub ntawv yog ib qho ua tiav ntawm cov teb; thiab a ntaub ntawv yog ib phau ntawv sau tseg. Mus saib tau cov ntaub ntawv los ntawm a database , koj xav tau a database tswj qhov system (DBMS).
Yog li ntawd, kev sau cov ntaub ntawv ntsig txog dab tsi?
Ib daim ntawv yog ib sau cov ntaub ntawv ntsig txog . Yog tias muaj 100 tus neeg ua haujlwm, ces txhua tus neeg ua haujlwm yuav muaj sau tseg (piv txwv li hu ua Employee Personal Details sau tseg ) thiab cov sau ntawm 100 li cov ntaub ntawv yuav tsim ib cov ntaub ntawv (qhov no, hu ua Employee Personal Details file). Cov ntaub ntawv tau muab tso rau hauv ib lub database.
Puas yog sau ib daim ntawv?
Teb: Cov sau cov ntaub ntawv hu ua database.
Pom zoo:
Dab tsi yog cov txiaj ntsig ntawm phau ntawv txhais lus cov ntaub ntawv?
Ib phau ntawv txhais lus tau tsim muaj tuaj yeem muab cov koom haum thiab kev lag luam ntau cov txiaj ntsig, suav nrog: Txhim kho cov ntaub ntawv zoo. Txhim kho kev ntseeg siab ntawm cov ntaub ntawv ncaj ncees. Txhim kho cov ntaub ntawv thiab kev tswj xyuas. Txo cov ntaub ntawv redundancy. Rov qab siv cov ntaub ntawv. Kev sib raug zoo ntawm kev siv cov ntaub ntawv. Kev txheeb xyuas cov ntaub ntawv yooj yim dua. Txhim kho kev txiav txim siab raws li cov ntaub ntawv zoo dua
Dab tsi yog lub hom phiaj ntawm delimiters nyob rau hauv cov ntawv sau npe ob hom ntawv cov ntaub ntawv delimiters?
Cov ntaub ntawv delimited yog cov ntawv nyeem siv los khaws cov ntaub ntawv, uas txhua kab sawv cev rau ib phau ntawv, tuam txhab, lossis lwm yam, thiab txhua kab muaj cov teb sib cais los ntawm tus lej
Lub luag haujlwm ntawm cov ntaub ntawv loj loj yog dab tsi?
Cov kws tshuaj ntsuam xyuas cov ntaub ntawv loj yog lub luag haujlwm rau kev siv cov ntaub ntawv txheeb xyuas thiab CRM los ntsuas lub koom haum kev ua tau zoo thiab muab cov lus pom zoo ntawm kev txhim kho. Cov kws tshuaj ntsuam no yuav tsom mus rau cov teeb meem xws li kev tshaj tawm thiab cov ntaub ntawv nyob thiab cov ntaub ntawv xa mus
Dab tsi yog cov txiaj ntsig tseem ceeb ntawm kev siv phau ntawv txhais lus cov ntaub ntawv?
Ib phau ntawv txhais lus tsim tau tuaj yeem muab cov koom haum thiab cov lag luam muaj txiaj ntsig ntau, suav nrog: Txhim kho cov ntaub ntawv zoo. Txhim kho kev ntseeg siab ntawm cov ntaub ntawv ncaj ncees. Txhim kho cov ntaub ntawv thiab kev tswj xyuas. Txo cov ntaub ntawv redundancy. Rov qab siv cov ntaub ntawv. Kev sib raug zoo ntawm kev siv cov ntaub ntawv. Kev txheeb xyuas cov ntaub ntawv yooj yim dua. Txhim kho kev txiav txim siab raws li cov ntaub ntawv zoo dua
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