Tsis txhob xav tias vim tias koj tsis txhob siv GUIDs ua cov yuam sij hauv pawg thiab zam kev hloov kho cov kab sib txawv-ntev ntev hauv koj cov ntxhuav ces koj cov pawg indexes yuav tiv thaiv kom tsis txhob tawg. … Koj tsuas yog yuav tsum paub tias lawv txhua tus tuaj yeem ua rau muaj kev tawg thiab paub yuav ua li cas txhawm rau txheeb xyuas, tshem tawm, thiab txo nws.
Puas yog pawg txheeb cais puas tau tawg?
Tom qab ntxig 2000 kab qhov tawg yog nyob ib ncig ntawm 4%. … Txawm li cas los xij, txhua cov ntaub ntawv yuav raug hloov kho tsawg kawg 3 zaug tom qab ntawd. Qhov no ua rau muaj qhov sib cais ntawm qhov ntsuas qhov ntsuas ntawm ntau dua 99% (nrog rau qhov ua kom tiav Fill)..
Yuav ua li cas indexes tau fragmented?
Nyob rau hauv B-ntoo (rowstore) indexes, fragmentation tshwm sim thaum indexes muaj nplooj ntawv nyob rau hauv uas lub logic ordering nyob rau hauv lub Performance index, raws li qhov tseem ceeb qhov tseem ceeb ntawm qhov Performance index, tsis phim lub cev ordering ntawm index pages.
Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm kev sib koom ua ke?
Ib pawg ntsuas ntsuas yog siv tau rau ntau cov lus nug vim tias cov ntaub ntawv raug txheeb xyuas ntawm tus yuam sij. Koj tuaj yeem txav ib lub rooj mus rau lwm pab pawg los ntawm kev tsim cov ntaub ntawv sib txuas ntawm ib pawg file sib txawv. Koj tsis tas yuav tso lub rooj li koj xav txav ib heap. Ib qho tseem ceeb ntawm pawg yog ib feem ntawm txhua qhov kev ntsuas tsis suav nrog.
Custered indexes khaws cia li cas?
Clustered indexes yog khaws cia li ntoo. Nrog kev sib koom ua ke, cov ntaub ntawv tiag tiag khaws cia hauv cov nplooj ntoo. Qhov no tuaj yeem ua kom tau txais qhov nrawmcov ntaub ntawv thaum nrhiav tau ua tiav ntawm qhov ntsuas. Raws li qhov tshwm sim, yuav tsum muaj cov haujlwm IO qis dua.
