Peb tuaj yeem khaws cov ntaub ntawv hauv database li cas?
Peb tuaj yeem khaws cov ntaub ntawv hauv database li cas?

Video: Peb tuaj yeem khaws cov ntaub ntawv hauv database li cas?

Video: Peb tuaj yeem khaws cov ntaub ntawv hauv database li cas?
Video: Npau Suav li no Txhob coj mus tham qhia luag lwm tus 2024, Kaum ib hlis
Anonim

Hauv ib database , cov ntaub ntawv yog khaws cia rau hauv rooj.

Qhov no txhais tau tias tag nrho cov cov ntaub ntawv yuav tsum yog khaws cia nyob rau hauv ib tug standardized maner. Qhov no yog vim li cas cov ntxhuav tau tsim. Cov ntxhuav yog cov khoom yooj yim tshaj plaws (cov qauv) rau cov ntaub ntawv khaws cia uas muaj nyob rau hauv ib database.

Hauv qhov no, SQL khaws cov ntaub ntawv li cas?

Qhov chaw disk faib rau a cov ntaub ntawv cov ntaub ntawv yog logically muab faib ua cov nplooj ntawv uas yog lub hauv paus chav tsev ntawm cov ntaub ntawv khaws cia hauv SQL ntawv Server. Ib nplooj ntawv database yog 8 KB chunk ntawm cov ntaub ntawv . Thaum koj ntxig ib qho cov ntaub ntawv hauv a SQL ntawv Server database, nws txuag lub cov ntaub ntawv mus rau ib tug series ntawm 8 KB nplooj ntawv nyob rau hauv lub cov ntaub ntawv ntaub ntawv.

Tsis tas li ntawd, cov ntaub ntawv yuav tsum muab khaws cia rau hauv ib lub database? Tsis txhob khaws cov ntaub ntawv hauv a database . Txhua tus, tsis muaj kev zam, uas tuaj yeem khiav ib qho RDBMS ntawm kev ua lag luam twb muaj database tshwj xeeb rau khaws cov ntaub ntawv , thiab RDBMS nws tus kheej siv nws! Qhov ntawd database yog filesystem.

Tom qab ntawd, ib tug kuj yuav nug, qhov twg yog qhov database khaws cia?

Database cov ntxhuav thiab indexes yuav yog khaws cia ntawm disk hauv ib qho ntawm ntau cov ntaub ntawv, suav nrog cov ntawv xaj / tsis muaj cov ntaub ntawv tiaj tus, ISAM, cov ntaub ntawv heap, hash thoob, lossis B + ntoo.

Cov ntaub ntawv khaws cia hauv Oracle database li cas?

Oracle Database faib qhov chaw logical rau txhua tus cov ntaub ntawv hauv database . Logical units ntawm database kev faib chaw yog cov ntaub ntawv blocks, extents, segments, thiab tablespaces. Nyob rau hauv lub cev, lub cov ntaub ntawv khaws cia hauv cov ntaub ntawv cov ntaub ntawv ntawm disk (saib Tshooj 11, "Lub Cev Lub Cev Lub Cev").

Pom zoo: