Read_committed_snapshot yog dab tsi?
Read_committed_snapshot yog dab tsi?

Video: Read_committed_snapshot yog dab tsi?

Video: Read_committed_snapshot yog dab tsi?
Video: YugabyteDB supports read committed isolation 2024, Kaum ib hlis
Anonim

Cov READ_COMMITTED_SNAPSHOT kev xaiv database txiav txim siab tus cwj pwm ntawm lub neej ntawd READ COMMITTED kev rho tawm theem thaum snapshot rho tawm tau qhib rau hauv cov ntaub ntawv. Yog tias koj tsis qhia meej meej READ_COMMITTED_SNAPSHOT ON, READ COMMITTED yog siv rau txhua qhov kev lag luam cuam tshuam.

Yog li ntawd, Rcsi SQL Server yog dab tsi?

SQL Server muab ob qho kev siv lub cev ntawm kev nyeem ntawv cog lus cais theem uas tau hais tseg los ntawm SQL ntawv txheem, ntsuas phoo nyeem cog lus thiab nyeem cog lus snapshot cais ( RCSI ).

Tsis tas li, kuv yuav ua li cas thiaj paub yog tias kev rho tawm snapshot tau qhib? Rau kuaj seb tus snapshot kev pauv nyiaj muab cais nyob ib leeg qib yog qhib , ua raws li cov kauj ruam no: Pib SQL Server Profiler.

Nco ntsoov tso saib TransactionID kem, nyem rau ntawm qhov Qhia tag nrho cov kab kos.

  1. Nyem Khiav kom pib txoj kab.
  2. Hauv Kev Tshawb Fawb Kev Tshawb Fawb Kev Lag Luam, ua tiav qhov Kev Pabcuam Kev Tshawb Fawb.

Raws li txoj cai, nyeem cov duab snapshot ua haujlwm li cas?

Lub tswv yim qab Nyeem Daim Snapshot Kev rho tawm yog cov hauv qab no: tsis txhob xauv cov ntaub ntawv thaum lub sijhawm nyeem ntawv theem nrog rau Kev Xauv Xauv, SQL Server yuav pob tshab rov qab koj cov qub cog lus sau ntawv version los ntawm Lub Khw Version. Lub Khw Version yog khaws cia hauv TempDb.

Dab tsi yog kev siv snapshot cais hauv SQL Server?

SNAPSHOT kev cais qhia tias cov ntaub ntawv nyeem hauv a kev pauv nyiaj yuav tsis muaj kev cuam tshuam txog kev hloov pauv los ntawm lwm yam kev lag luam ib txhij. Cov kev lag luam siv cov ntaub ntawv kab versions uas muaj nyob thaum lub kev pauv nyiaj pib.

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