Puas yog SQL hloov kho lub rooj xauv?
Puas yog SQL hloov kho lub rooj xauv?

Video: Puas yog SQL hloov kho lub rooj xauv?

Video: Puas yog SQL hloov kho lub rooj xauv?
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Feem ntau tsis yog, tab sis nws nyob ntawm (feem ntau siv teb rau SQL ntawv Server!) SQL Server yuav tsum kaw tus cov ntaub ntawv koom nrog a kev pauv nyiaj hauv qee txoj kev. Nws yuav tsum xauv cov ntaub ntawv nyob rau hauv lub rooj nws tus kheej, thiab cov data ib cuam tshuam indexes, thaum koj ua ib qho kev hloov kho.

Dhau li, ua SQL kev lag luam xauv cov rooj?

LOCK IN SHARE MODE hauv a kev pauv nyiaj , raws li koj tau hais, txij li feem ntau SELECTs, txawm tias lawv nyob hauv ib qho kev pauv nyiaj los tsis, yuav tsis xauv a rooj.

Kuj Paub, koj tuaj yeem qhia tau li cas yog tias lub rooj raug kaw hauv SQL? Hauv SQL ntawv Server 2005 (SSMS, object Explorer) Expand-server-management-ob npaug nias Kev Ua Haujlwm Saib Xyuas. ntawm sab laug koj muaj peb txoj kev xaiv los ntawm, xaiv cov kev xaiv thiab koj tuaj yeem pom tag nrho cov xauv cov ntaub ntawv ntsig txog. khiav qhov txheej txheem khaws cia hauv lub database.

Tsis tas li lo lus nug yog, dab tsi yog hloov tshiab xauv hauv SQL Server?

Hloov tshiab xauv yog internal xauv ua kom tsis txhob muaj kev tsis sib haum xeeb i.e rau kev xav tias 3 txheej txheem ntawm 5 xav tau hloov tshiab cov ntaub ntawv. Peb cov txheej txheem no thov cov server los muab qhov tshwj xeeb xauv qe cov server tsis tuaj yeem tawm tau yooj yim vim tias 2 txheej txheem tseem tab tom nyeem cov ntaub ntawv thiab sib koom xauv tseem nyob.

Dab tsi yog rooj xauv hauv SQL Server?

Xauv : Xauv yog ib tug mechanism los xyuas kom meej cov ntaub ntawv sib xws. SQL Server locks khoom thaum qhov kev sib pauv pib. Thaum qhov kev hloov pauv tiav lawm, SQL Server tso tawm kaw khoom. Tshwj xeeb (X) Locks : Thaum no xauv hom tshwm sim, nws tshwm sim los tiv thaiv lwm yam kev hloov pauv lossis nkag mus rau a kaw khoom.

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