Video: Vim li cas koj thiaj li xav tau txoj hauv kev database dua li kev ua cov ntaub ntawv ib txwm muaj?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhov zoo ntawm DBMS ntawm cov ntaub ntawv system
Ob peb ntawm lawv yog raws li nram no: Tsis muaj redundant cov ntaub ntawv : Redundancy tshem tawm los ntawm cov ntaub ntawv normalization. Tsis muaj cov ntaub ntawv duplication txuag cia thiab txhim kho lub sijhawm nkag mus. Yooj yim nkag mus cov ntaub ntawv – Database systems tswj cov ntaub ntawv nyob rau hauv xws li ib txoj kev kom tus cov ntaub ntawv yooj yim nkag tau nrog lub sij hawm teb ceev.
Ntawm no, dab tsi yog qhov zoo ntawm kev tswj cov ntaub ntawv mus rau hauv txoj kev ua cov ntaub ntawv?
Qee qhov zoo ntawm kev siv database muaj xws li cov ntaub ntawv zoo ib yam, yoog raws, kev tswj xyuas yooj yim cov ntaub ntawv kev ruaj ntseg thiab kev ceev ntiag tug thiab txo lub sij hawm txhim kho daim ntawv thov.
Ib yam li ntawd, ua li cas cov ntaub ntawv ib txwm ua txawv ntawm cov ntaub ntawv mus kom ze? Cov txawv nruab nrab ua ntaub ntawv thov system thiab database tswj qhov system yog raws li nram no: A ua ntaub ntawv thov system yog ib phau ntawm cov kev pab cuam uas khaws thiab tswj cov ntaub ntawv hauv computer hard disk. Kev ua ntaub ntawv system tsis muab cov ntaub ntawv sib xws, whereas dbms ua muab cov ntaub ntawv sib xws los ntawm normalization.
Kuj nug, dab tsi yog qhov zoo ntawm cov ntaub ntawv raws li qhov system?
Qhov zoo ntawm Cov Ntaub Ntawv - taw qhia qhov system : Nws tuaj yeem siv ceev thiab tsis siv neeg rov qab ntawm cov ntaub ntawv khaws cia hauv cov ntaub ntawv ntawm lub computer- raws li systems . lub computer tshuab muab kev ua haujlwm los ua haujlwm rau lub hom phiaj no.it kuj tseem tuaj yeem tsim kho cov ntawv thov tshwj xeeb rau lub hom phiaj no.
Dab tsi yog teeb meem nrog kev ua cov ntaub ntawv ib txwm muaj?
Teeb meem tshwm sim los ntawm tsoos ntaub ntawv ib puag ncig muaj xws li: Data redundancy: duplicate cov ntaub ntawv nyob rau hauv ntau yam cov ntaub ntawv , ua rau cov ntaub ntawv tsis sib xws, cov nqi sib txawv siv rau tib tus cwj pwm. Program-data dependency: Hloov cov kev pab cuam uas yuav tsum tau hloov cov ntaub ntawv. Tsis yooj yim.
Pom zoo:
Vim li cas cov ntaub ntawv tiaj tus tsis zoo dua li cov ntaub ntawv sib raug zoo?
Ib lub rooj ua ntaub ntawv tiaj tus yog qhov tseem ceeb rau kev sau cov ntaub ntawv tsawg. Tab sis cov ntaub ntawv loj loj tuaj yeem ua tsis tau raws li nws siv ntau qhov chaw thiab nco dua li cov ntaub ntawv sib txheeb. Nws kuj yuav tsum tau muab cov ntaub ntawv tshiab ntxiv txhua zaus koj nkag mus rau cov ntaub ntawv tshiab, qhov kev sib raug zoo database tsis
Vim li cas cov kws saib xyuas neeg mob xav tau cov ntaub ntawv pov thawj raws li kev coj ua?
EBP ua rau cov kws saib xyuas neeg mob soj ntsuam kev tshawb fawb kom lawv nkag siab txog qhov txaus ntshai lossis kev ua tau zoo ntawm kev kuaj mob lossis kev kho mob. Daim ntawv thov EBP ua rau cov kws saib xyuas neeg mob suav nrog cov neeg mob hauv lawv txoj kev npaj saib xyuas
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 VM Series koj yuav tsum xav txog yog tias koj xav tau cov ntawv thov host uas xav tau kev ua haujlwm siab IO rau cov ntaub ntawv tsis tu ncua?
Teb: VM series uas koj yuav tsum yog xav txog yog tias koj xav tau txais cov ntawv thov uas xav tau kev ua haujlwm siab rau cov ntaub ntawv tsis tu ncua yog VMware workstation, Oracle VM virtual box lossis Microsoft Azure suav. Cov khoom siv no muaj qhov yooj yim tshaj plaws ntawm kev ua haujlwm hosting
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