Cov txheej txheem:

Yuav ua li cas kuv nug ib tug tuning nyob rau hauv SQL Server?
Yuav ua li cas kuv nug ib tug tuning nyob rau hauv SQL Server?

Video: Yuav ua li cas kuv nug ib tug tuning nyob rau hauv SQL Server?

Video: Yuav ua li cas kuv nug ib tug tuning nyob rau hauv SQL Server?
Video: Sua Vaj - Kuv Ua Tus Phem 2024, Kaum ib hlis
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Cov lus qhia yooj yim ntawm tuning SQL Server queries

  1. Tsis txhob siv lub * hauv koj lus nug .
  2. 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.
  3. Zam kev saib.
  4. 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.
  5. 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

  1. Qhov ntau lim nyob rau hauv qhov twg clause qhov zoo dua.
  2. Xaiv cov kab uas koj xav tau xwb.
  3. Nco ntsoov Joins.
  4. Rov mus xyuas indexing feem ntau.
  5. Tsim cov indexes ntawm boolean thiab lej cov ntaub ntawv hom.
  6. 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

  1. Tsis txhob sib koom ntau yam hauv ib lo lus nug.
  2. Tshem tawm Cursors los ntawm Cov Lus Nug.
  3. Tsis txhob siv cov lus nug tsis cuam tshuam nrog Scalar Sub Query.
  4. Tsis txhob muaj ntau nqe lus Table Valued Functions (TVFs)
  5. Tsim thiab siv Index.
  6. Nkag siab cov ntaub ntawv.
  7. Tsim ib qho Kev Xaiv Zoo Tshaj Plaws.
  8. 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: