Cov txheej txheem:
Video: Kuv yuav ua li cas kom kuv Oracle hloov tshiab sai dua?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Tus qauv SQL rau DML UPDATE cov lus tuaj yeem ua rau nyuaj thiab tsis sib haum xeeb thiab muaj cov kev coj ua zoo tshaj plaws uas tuaj yeem pab koj sau cov lus UPDATE tau zoo
- Khiav cov hloov tshiab hauv batch hom.
- Siv CTAS los ntawm kev hloov tshiab loj.
- suav nrog cov xwm txheej SET nyob rau hauv nqe lus nyob qhov twg.
- Simplify qhov WHERE predicates.
Cov lus nug tseem yog, Kuv tuaj yeem ua Oracle hloov tshiab sai dua li cas?
Tus qauv SQL rau DML UPDATE cov lus tuaj yeem ua rau nyuaj thiab tsis sib haum xeeb thiab muaj cov kev coj ua zoo tshaj plaws uas tuaj yeem pab koj sau cov lus UPDATE tau zoo
- Khiav cov hloov tshiab hauv batch hom.
- Siv CTAS los ntawm kev hloov tshiab loj.
- suav nrog cov xwm txheej SET nyob rau hauv nqe lus nyob qhov twg.
- Simplify qhov WHERE predicates.
Qhov thib ob, yog kev sib koom ua ke sai dua li hloov tshiab hauv Oracle? Peb tau lub hom phiaj teeb tsa peb lub rooj sib tham kom cov INSERTs nws yuav ua thaum sib koom nrog lub hom phiaj yog cuam tshuam nrog cov ntaub ntawv uas twb muaj lawm rau thawj 500, 000 kab. Cov no qhia tias MERGE siv li 28% ntau CPU thiab 29% ntau dua lub sijhawm tshaj qhov sib npaug INSERT / Hloov tshiab.
Tib neeg kuj nug, Kuv tuaj yeem txhim kho kuv qhov kev ua tau zoo Oracle li cas?
3 Txoj hauv kev los txhim kho Oracle Database Performance
- Txheeb xyuas thiab tsom rau SQL khiav rau qhov teeb meem nkaus xwb los ntawm tus neeg siv qhov kev xav.
- Taug qab thiab ntsuas qhov kev sib tham tshwj xeeb uas siv cov cuab yeej taug qab los txheeb xyuas SQL txheeb cais, kev npaj ua tiav thiab tos sij hawm them nqi.
Qhov twg yog qhov hloov tshiab sai dua lossis ntxig?
Feem ntau, Hloov tshiab yog ntau sai dua tshaj DELETE + INSERT , nws yog ib qho lus txib.
Pom zoo:
Dab tsi yog qhov sib txawv ntawm kev rov ua dua tshiab thiab kev kho dua tshiab?
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Puas yog ib qho kev hloov pauv hloov tshiab ua rau muaj kev ua haujlwm tau hais tseg ntawm kev hloov tshiab?
Cov qauv tsis ua rau 'cov ntaub ntawv hloov tshiab,' thiab yog li feem ntau tsis tuaj yeem tua tsis tau dab tsi (ua rau, cov cai ua haujlwm, ntws, cov lus tawm, thiab lwm yam). Koj tuaj yeem xaiv kom rov ua haujlwm rov ua haujlwm cov cai thaum qhov hloov tshiab ua rau cov ntaub ntawv hloov pauv, tab sis kuv tsis paub meej tias yuav pab tau koj li cas