Dab tsi yog hom ntaub ntawv phau ntawv txhais lus?
Dab tsi yog hom ntaub ntawv phau ntawv txhais lus?

Video: Dab tsi yog hom ntaub ntawv phau ntawv txhais lus?

Video: Dab tsi yog hom ntaub ntawv phau ntawv txhais lus?
Video: Vajtswv txoj lus (phau ntawv Tshwmsim)/7: Tus pojniam muag cev 2024, Kaum ib hlis
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Muaj ob hom ntaub ntawv phau ntawv txhais lus - Active thiab Passive.

Hais txog qhov no, dab tsi yog qhov txawv ntawm cov ntaub ntawv phau ntawv txhais lus cov khoom?

rooj, qauv, views, domains, cov ntaub ntawv khoom, xauv khoom , Sib code khoom.

Tsis tas li ntawd, phau ntawv txhais lus thiab piv txwv yog dab tsi? 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.

dab tsi mus hauv phau ntawv txhais lus cov ntaub ntawv?

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.

DBMS piav qhia cov ntaub ntawv txhais lus yog dab tsi?

Cov ntaub ntawv phau ntawv txhais lus hauv DBMS . Cov ntaub ntawv phau ntawv txhais lus tuaj yeem yog txhais as a DBMS Cheebtsam uas khaws cov txhais yam ntxwv ntawm cov ntaub ntawv thiab kev sib raug zoo. Qhov no " cov ntaub ntawv txog cov ntaub ntawv " tau sau npe ua metadata. Cov ntaub ntawv phau ntawv txhais lus muab cov DBMS nrog nws tus kheej piav qhia yam ntxwv.

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