Clustered index scan Zoo lossis phem: Yog tias kuv yuav tsum txiav txim siab seb nws puas yog qhov zoo lossis qhov phem, nws tuaj yeem yog qhov phem. Tshwj tsis yog tias muaj coob tus kab, nrog ntau kab thiab kab, tau muab los ntawm cov lus tshwj xeeb, Clustered Index Scan, tuaj yeem ua rau kev ua haujlwm tsis zoo.
Puas ib pawg ntsuas ntsuas txhim kho kev ua tau zoo?
Cov Clustered Indexs zoo tuaj yeem txhim kho kev ua haujlwm ntawm ntau yam haujlwm ntawm SQL Server rooj. … Kom paub meej, muaj qhov ntsuas tsis yog pawg nrog rau qhov ntsuas qhov ntsuas ntawm tib kab yuav ua rau kev ua haujlwm tsis zoo ntawm kev hloov tshiab, ntxig, thiab tshem tawm, thiab nws yuav siv qhov chaw ntxiv rau ntawm disk.
Puas Clustered Performance index Scan zoo dua li lub rooj scan?
Thiab, tau kawg, qhov ntsuas qhov ntsuas tau tso cai rau koj ua CLUSTERED INDEX SEEK, uas yog zoo nkauj heev rau kev ua tau zoo… ib heap uas tsis muaj qhov ntsuas yuav ib txwm ua rau lub rooj. scan. Yog li: Rau koj cov lus nug piv txwv uas koj xaiv tag nrho cov kab, qhov sib txawv tsuas yog cov npe txuas ob npaug ntawm pawg tswj hwm.
Dab tsi ua rau Clustered Performance index Scan?
koj tau thov cov kab ncaj qha rau hauv cov lus nug uas yog vim li cas koj thiaj li tau txais ib pawg SEEK. Clustered index scan: Thaum Sql server nyeem los ntawm kab (s) los ntawm sab saum toj mus rau hauv qab hauv pawg ntsuas. piv txwv li tshawb nrhiav cov ntaub ntawv hauv kab tsis tseem ceeb.
Clustered index Scan txhais li cas?
Peb tuaj yeem hais tias, Clustered Index Scan yog zoo ib yam li Lub Rooj Scan lag luam piv txwv li tag nrho qhov ntsuasyog traversed kab los ntawm kab rov qab cov ntaub ntawv teev. Yog tias SQL Server optimizer txiav txim siab tias muaj ntau kab yuav tsum tau xa rov qab nws yog qhov nrawm dua los luam theej txhua kab dua li siv cov yuam sij ntsuas.
