Video: Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov ntaub ntawv phau ntawv txhais lus . Los ntawm Systems Analysis thiab Design : A Structured Approach: A cov ntaub ntawv phau ntawv txhais lus yog ib phau ntawm cov ntaub ntawv txog cov ntaub ntawv . Nws tuav cov ntaub ntawv hais txog kev txhais, qauv, thiab kev siv ntawm txhua tus cov ntaub ntawv yam uas lub koom haum siv. Muaj ntau tus cwj pwm uas yuav khaws cia txog ib cov ntaub ntawv keeb.
Tsis tas li ntawd, phau ntawv txhais lus yog dab tsi thiab nws lub hom phiaj ua haujlwm li cas?
Nws tso cai rau txhua tus neeg siv (thiab programmers) los qhia txog kev pom zoo ntawm cov cov ntaub ntawv cov peev txheej, yog li ua kom yooj yim rau kev txheeb xyuas cov neeg siv xav tau.
Tsis tas li ntawd, cov ntaub ntawv phau ntawv txhais lus piav qhia nrog piv txwv li cas? A cov ntaub ntawv phau ntawv txhais lus yog qhov chaw khaws cia hauv nruab nrab ntawm metadata. Metadata yog cov ntaub ntawv txog cov ntaub ntawv . Ib txhia piv txwv ntawm yam uas yuav muaj nyob rau hauv ib lub koom haum cov ntaub ntawv phau ntawv txhais lus suav nrog: • Cov npe ntawm thaj chaw muaj nyob hauv txhua lub koom haum cov ntaub ntawv.
Qhov thib ob, dab tsi suav nrog hauv phau ntawv txhais lus cov ntaub ntawv?
A Cov ntaub ntawv phau ntawv txhais lus yog ib qho kev piav qhia ntawm cov ntaub ntawv nyob rau hauv cov nqe lus lag luam, kuj suav nrog cov ntaub ntawv hais txog cov cov ntaub ntawv xws li cov ntaub ntawv hom, cov ntsiab lus ntawm cov qauv, thiab kev txwv kev ruaj ntseg. Tsis zoo li Kev Lag Luam Glossaries, uas tsom rau cov ntaub ntawv thoob plaws lub koom haum, Cov ntaub ntawv Dictionaries kev txhawb nqa Cov ntaub ntawv Warehouses los ntawm txhais tau tias yuav siv lawv li cas.
Dab tsi yog phau ntawv txhais lus cov ntaub ntawv hauv DBMS?
A cov ntaub ntawv phau ntawv txhais lus yog ib cov ntaub ntawv los yog ib txheej ntawm cov ntaub ntawv uas muaj ib tug database metadata. Cov cov ntaub ntawv phau ntawv txhais lus muaj cov ntaub ntawv hais txog lwm yam khoom hauv database, xws li cov ntaub ntawv kev ua tswv cuab, cov ntaub ntawv kev sib raug zoo rau lwm yam khoom, thiab lwm yam cov ntaub ntawv . Feem ntau, tsuas yog cov thawj tswj hwm database cuam tshuam nrog cov cov ntaub ntawv phau ntawv txhais lus.
Pom zoo:
Cov lus twg yog siv rau cov ntaub ntawv tshawb fawb thiab kev txheeb xyuas qib siab?
Python Ib yam li ntawd, hom lus twg yog qhov zoo tshaj plaws rau cov ntaub ntawv tshawb fawb? Sab saum toj 8 hom lus programming txhua tus kws tshawb fawb cov ntaub ntawv yuav tsum paub hauv 2019 Python. Python yog lub hom phiaj nrov heev, muaj zog, thiab yog ib hom lus siv dav hauv cov ntaub ntawv tshawb fawb hauv zej zog.
Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas kev lag luam?
Cov Ntawv Txhais Lus Cov Ntaub Ntawv yog RML cov qauv ntaub ntawv uas khaws cov ntsiab lus ntawm qib teb txog cov ntaub ntawv hauv ib qho system lossis cov tshuab. Thaum lub sij hawm qhov yuav tsum tau ua, lub hom phiaj tsis yog ntawm cov ntaub ntawv tiag tiag hauv cov ntaub ntawv lossis kev tsim qauv tsim nyog los siv cov khoom lag luam cov ntaub ntawv hauv cov ntaub ntawv
Dab tsi yog qhov tsim qauv tsim qauv tsim thiab lub cev database tsim?
Logical database modeling suav nrog; ERD, daim duab ua lag luam, thiab cov ntaub ntawv tawm tswv yim rau cov neeg siv; whereasphysical database modeling suav nrog; server qauv daim duab, database tsim cov ntaub ntawv, thiab cov neeg siv cov ntaub ntawv tawm tswv yim
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
Dab tsi yog phau ntawv txhais lus cov ntaub ntawv hauv kev tshawb fawb?
Cov Ntaub Ntawv Txhais Lus Txhais Lus Phau Ntawv Qhia Cov Ntaub Ntawv yog ib phau ntawm cov npe, cov ntsiab lus, thiab cov yam ntxwv ntawm cov ntaub ntawv uas tau siv los yog ntes hauv cov ntaub ntawv, cov ntaub ntawv xov xwm, lossis ib feem ntawm qhov kev tshawb fawb. Ib phau ntawv txhais lus cov ntaub ntawv tseem muab cov metadata txog cov ntaub ntawv