Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?
Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?

Video: Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?

Video: Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?
Video: Saib Mis paub Poj niam (hluas nkauj) tus yam ntxwv lub siab 2024, Hlis ntuj nqeg
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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.

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