Video: Puas indexes qeeb hloov tshiab?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
1 Teb. Database indexes ua database hloov tshiab qeeb thiab sai dua tib lub sijhawm. Qhov no nyob ntawm tus hloov tshiab nqe lus: Thaum koj muaj hloov tshiab ntawm txhua kab zoo li hloov tshiab mytable set mycolumn = 4711 ces qhov ntsuas creation yuav qeeb tus hloov tshiab , vim nws yog ib co haujlwm ntxiv uas xav tau sijhawm.
Raws li, ua indexes ceev hloov tshiab?
Index muaj nuj nqis rau inserts, tshiab , thiab deletes. Derby yuav tsum ua ua hauj lwm tswj indexes . Yog koj hloov tshiab ib lub rooj, lub system yuav tsum tswj cov indexes uas yog nyob rau kab kho tshiab . Yog li muaj ntau indexes ua tau ceev ceev xaiv cov nqe lus, tab sis maj mam ntxig ntxig, tshiab , thiab deletes.
Yuav ua li cas indexes cuam tshuam qhov hloov tshiab thiab tshem tawm kev ua haujlwm? Ib txoj cai ntawm tus ntiv tes xoo yog qhov ntau indexes koj muaj nyob rau ntawm lub rooj, qhov qeeb INSERT , UPDATE, thiab DELETE kev ua haujlwm yuav yog. Qhov no yog vim li cas ntxiv indexes rau kev ua tau zoo yog kev lag luam tawm, thiab yuav tsum sib npaug kom zoo. Yog, nws kiag li cuam tshuam kev ua haujlwm rau INSERTUPDATEDELETE kev ua haujlwm.
Ib yam li ntawd ib tug yuav nug, puas indexes slow down inserts?
1 Teb. Index thiab kev txwv yuav qeeb inserts vim tias tus nqi kuaj xyuas thiab tswj cov no tsis pub dawb. Cov nyiaj siv ua haujlwm tsuas tuaj yeem txiav txim siab nrog kev ntsuas kev ua tau zoo.
Yuav ua li cas indexes cuam tshuam rau database kev ua tau zoo?
Index yog cov qauv ntaub ntawv uas tso cai rau koj xaiv sai thiab txheeb cov kab hauv a database rooj. Piv txwv li, yog tias koj cov ntxhuav feem ntau cuam tshuam los ntawm INSERT, Hloov Kho, lossis DELETE cov lus, ces koj tag nrho kev ua tau zoo poob vim indexes yuav tsum tau hloov kho tom qab cov haujlwm ntawd.
Pom zoo:
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Puas indexes ceev hloov tshiab?
Indexs muaj tus nqi rau kev ntxig, hloov tshiab, thiab tshem tawm. Derby yuav tsum ua hauj lwm los tswj cov indexes. Yog tias koj hloov kho lub rooj, lub kaw lus yuav tsum tswj cov indexes uas nyob rau ntawm cov kab tau hloov kho. Yog li muaj ntau qhov indexes tuaj yeem ua kom ceev cov lus xaiv, tab sis maj mam ntxig, hloov tshiab, thiab tshem tawm
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