Cov txheej txheem:
Video: Yuav ua li cas kuv nug ib tug tuning nyob rau hauv SQL Server?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov lus qhia yooj yim ntawm tuning SQL Server queries
- Tsis txhob siv lub * hauv koj lus nug .
- Txhua kab ntawv koom nrog hauv kev ntsuas yuav tsum tshwm sim ntawm qhov twg thiab koom nrog cov kab lus ntawm tib qhov lawv tshwm sim ntawm qhov ntsuas.
- Zam kev saib.
- Tshawb xyuas yog tias qhov tseem ceeb nug nce kev ua tau zoo los ntawm kev xa nws mus rau hauv cov txheej txheem khaws cia.
- Tsis txhob koom ntau dhau ntawm koj nug : siv tsuas yog qhov tsim nyog!
Ib yam li ntawd, koj yuav ua li cas txhim kho cov lus nug hauv SQL Server?
Cov kev coj ua zoo tshaj plaws
- Qhov ntau lim nyob rau hauv qhov twg clause qhov zoo dua.
- Xaiv cov kab uas koj xav tau xwb.
- Nco ntsoov Joins.
- Rov mus xyuas indexing feem ntau.
- Tsim cov indexes ntawm boolean thiab lej cov ntaub ntawv hom.
- Xyuas kom cov indexes npog qhov twg clauses.
Tsis tas li ntawd, cov lus nug optimization hauv SQL yog dab tsi? Lus nug optimization yog tag nrho cov txheej txheem ntawm kev xaiv cov txiaj ntsig zoo tshaj plaws ntawm kev ua tiav a SQL ntawv nqe lus. SQL ntawv yog ib hom lus uas tsis yog txheej txheem, yog li tus optimizer pub dawb rau kev sib koom ua ke, rov tsim kho, thiab ua tiav hauv txhua qhov kev txiav txim. Lub database optimizes txhua SQL ntawv nqe lus raws li kev txheeb cais sau txog cov ntaub ntawv nkag.
Hais txog qhov no, kuv tuaj yeem txhim kho kuv cov lus nug ua tau zoo li cas?
10 Txoj Kev Txhim Kho SQL Query Performance
- Tsis txhob sib koom ntau yam hauv ib lo lus nug.
- Tshem tawm Cursors los ntawm Cov Lus Nug.
- Tsis txhob siv cov lus nug tsis cuam tshuam nrog Scalar Sub Query.
- Tsis txhob muaj ntau nqe lus Table Valued Functions (TVFs)
- Tsim thiab siv Index.
- Nkag siab cov ntaub ntawv.
- Tsim ib qho Kev Xaiv Zoo Tshaj Plaws.
- Muab ib kab hauv ib qho Index.
Cov lus nug optimization nrog piv txwv yog dab tsi?
Lus nug optimization yog ib tug feature ntawm ntau relational database tswj systems. Cov nug optimizer sim txiav txim siab txoj hauv kev ua tau zoo tshaj plaws los ua kom tiav qhov muab nug los ntawm kev xav txog qhov ua tau nug kev npaj.
Pom zoo:
Yuav ua li cas yog ib tug txheej txheem nyob rau hauv lub operating system dab tsi yog ib tug xov nyob rau hauv lub operating system?
Ib tug txheej txheem, nyob rau hauv cov nqe lus yooj yim tshaj, yog ib tug executingprogram. Ib tug los yog ntau tshaj threads khiav nyob rau hauv cov ntsiab lus ntawm cov txheej txheem. Ib tug xov yog ib qho tseem ceeb chav tsev uas theoperating system faib lub sij hawm processor. Lub threadpool feem ntau yog siv los txo tus naj npawb ntawm cov ntaub ntawv thov thiab muab kev tswj hwm ntawm cov neeg ua haujlwm threads
Yuav ua li cas koj hlawv ib DVD rau ib tug Mac uas yuav ua si nyob rau hauv ib tug DVD player?
Part 1: Hlawv playable DVD Mac Disk Utility Kauj Ruam 1: Los ntawm Mac Finder, xaiv ib tug disk imagefile. Kauj ruam 2: Rub lub "Cov ntaub ntawv" ntawv qhia zaub mov thiab xaiv "Hlawv Disk Duab (Npe) rauDisc…" Kauj ruam 3: Ntxig ib tug dawb paug DVD, CD, los yog CDRW disc rau hauv lub tsav, ces nias rau ntawm lub "Hlawv" khawm
Yuav ua li cas kuv ua si ib tug yees duab nyob rau hauv PowerPoint nrog ib tug clicker?
Hauv Cov Cuab Yeej Yees Duab, ntawm Playback tab, hauv VideoOptions pawg, hauv cov npe pib, ua ib qho hauv qab no: Txhawm rau ua si koj cov vis dis aus thaum tus swb uas muaj cov yeeb yaj kiab tshwm hauv Slide Show, xaiv Automatically. Txhawm rau tswj xyuas thaum koj xav pib cov yees duab los ntawm nias tus nas, xaiv On Nyem
Yuav ua li cas koj muab ib tug nplaub tshev nyob rau hauv ib tug nplaub tshev ntawm ib tug iPhone?
Yuav ua li cas muab Folders hauv Folders Coj mus rhaub thiab tuav ib qho app nkag mus rau hom hloov kho. Tsim ib lub nplaub tshev tshiab los ntawm kev tso ib qho app rau saum lwm tus. Sai li ob lub apps sib koom ua ke los tsim ib daim ntawv tais ceev tseg, rub lub nplaub tshev uas twb muaj lawm hauv qhov tsim tshiab ua ntej nws tuaj yeem teeb tsa
Yuav ua li cas koj tsim ib tug rau ntau txoj kev sib raug zoo nyob rau hauv ib tug database system?
Txhawm rau tsim kom muaj kev sib raug zoo ib leeg rau ob qho tib si ntawm thaj chaw (feem ntau yog thawj qhov tseem ceeb thiab txawv teb chaws qhov tseem ceeb) yuav tsum muaj qhov ntsuas tshwj xeeb. Txhawm rau tsim kom muaj kev sib raug zoo ib-rau-ntau Lub teb ntawm ib sab (feem ntau yog qhov tseem ceeb) ntawm kev sib raug zoo yuav tsum muaj qhov ntsuas tshwj xeeb