Video: Koj puas tuaj yeem tsim qhov ntsuas ntawm lub rooj sib txawv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Tsim ib qho index ntawm lub rooj sib txawv tuaj yeem yuav tsum ua implicitly nyob rau hauv kev tshaj tawm ntawm lub rooj variable los ntawm kev txhais lub ntsiab tseem ceeb thiab tsim tshwj xeeb txwv. Koj ua tau kuj tsim qhov sib npaug ntawm ib pawg qhov ntsuas . Ua yog li ntawd, tsuas yog ntxiv cov lus khaws tseg cia.
Yog li ntawd, peb puas tuaj yeem tsim qhov ntsuas ntawm lub rooj sib txawv hauv SQL Server?
Hauv SQL Server 2000 - 2012 indexes ntawm lub rooj sib txawv tuaj yeem tsuas yog ua tsim implicitly los ntawm tsim UNIQUE lossis PRIMARY KEY txwv. Qhov sib txawv ntawm cov kev txwv no yog qhov tseem ceeb ntawm qhov tseem ceeb yuav tsum nyob rau ntawm kab uas tsis yog nullable. Cov kab uas koom nrog hauv ib qho kev txwv tshwj xeeb tuaj yeem yog nullable.
Tsis tas li ntawd, peb puas tuaj yeem tsim qhov ntsuas tsis suav nrog ntawm lub rooj sib txawv hauv SQL Server? YOG ib txoj kev mus tsim ib qho tsis tshwj xeeb qhov ntsuas pe ib temp rooj , siv qhov ua kom yuam kev me me: ntxiv ib kab ntawv qhia tus kheej thiab ua rau nws qhov chaw kawg ntawm koj tus yuam sij tseem ceeb. Lub xwb indexes koj ua tau thov rau rooj variables yog cov implicit indexes uas yog tom qab PRIMARY KEY lossis UNIQUE txwv.
Koj ua li cas los tsim ib qho index variable?
Rau tsim ib new sib txawv , nyem qhov Tsim tshiab sib txawv ” xaiv nyob rau sab laug ces kaum, nyob rau hauv lub resulting popup, xaiv hom twg sib txawv rau tsim , ces txuas ntxiv mus tsim qhov tshiab sib txawv . Xaiv qhov kev xaiv thib peb rau tsim tus Index variable . Ntawm no peb pom cov kev xaiv rau xaiv hom sib txawv tsim nyog.
Dab tsi yog qhov Performance index hauv ib lub rooj?
Ib qhov ntsuas yog ib daim qauv ntawm cov kab ntawv xaiv ntawm cov ntaub ntawv los ntawm a rooj , hu ua tus yuam sij database lossis tus yuam sij yooj yim, uas tuaj yeem tshawb nrhiav tau zoo heev uas tseem suav nrog qhov chaw nyob qis qis lossis qhov txuas ncaj qha mus rau kab tiav ntawm cov ntaub ntawv nws tau theej los ntawm.
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Puas yog lub rooj virtual uas muab lub qhov rais los ntawm qhov twg ib tus tuaj yeem pom cov ntaub ntawv?
Zoo li kev sib koom ua haujlwm, qhov kev pom yog ib qho piv txwv ntawm cov qauv kev sib raug zoo. Ib qho kev pom tsim ib lub rooj virtual los ntawm SELECT nqe lus thiab qhib lub ntiaj teb ntawm kev yooj yim rau kev txheeb xyuas cov ntaub ntawv thiab kev tswj xyuas. Koj tuaj yeem xav txog qhov pom raws li lub thav duab txav tau los yog qhov rais uas koj tuaj yeem pom cov ntaub ntawv
Qhov twg nyob rau hauv ib lub rooj ntaub ntawv yuav tsum tau muab tso rau qhov ntsuas ntsuas?
Nyob rau hauv ib lub rooj ntaub ntawv, units ntawm kev ntsuas yuav tsum tau qhia nyob rau hauv cov nqe lus ntawm cov kab uas cov ntaub ntawv muaj nuj nqis teev. Qhov no qhia tau hais tias chav tsev qhia siv rau tag nrho cov ntaub ntawv muaj nuj nqis teev nyob rau hauv kab
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index
Dab tsi yog qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas?
Xav txog nws li no: rhiab heev yog ib qho kev ntsuas ntawm qhov hloov pauv ntawm lub koob yees duab qhov chaw saib uas tsim nyog raws li qhov muaj peev xwm tshawb pom, thiab qhov pib yog qhov ntau npaum li cas ntawm cov lus tsa suab yuav tsum tshwm sim txhawm rau txhawm rau ua rau lub tswb