Video: Dab tsi yog timestamp ordering protocol?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov Timestamp Ordering Protocol yog siv rau xaj kev pauv hloov raws li lawv Daim ntawv teev sijhawm . Txhawm rau txiav txim siab daim ntawv teev sijhawm ntawm kev ua lag luam, qhov no raws tu qauv siv lub sij hawm system los yog logical counter. Lub xauv-raws li raws tu qauv yog siv los tswj cov xaj nruab nrab ntawm kev tsis sib haum xeeb ntawm cov kev sib pauv thaum lub sijhawm ua tiav.
Ua raws li qhov no hauv kev txiav txim siab, dab tsi yog lub sijhawm xaj xaj raws tu qauv hauv DBMS?
Timestamp Ordering Protocol - Algorithm yuav tsum xyuas kom meej tias, rau txhua yam khoom nkag los ntawm Kev Ua Haujlwm tsis sib haum xeeb hauv lub sijhawm, lub xaj nyob rau hauv uas cov khoom yog accessed tsis ua txhaum lub xaj . Yuav kom paub meej qhov no, siv ob Daim ntawv teev sijhawm Cov txiaj ntsig ntsig txog txhua yam khoom database X.
Tsis tas li ntawd, Multiversion timestamp ordering yog dab tsi? Reed tus multiversion timestamp ordering scheme daws qhov teeb meem no los ntawm xaj kev hloov pauv thiab rho tawm kev hloov pauv uas nkag mus rau cov ntaub ntawv tawm ntawm xaj . Yog tias ob qho kev hloov pauv nkag mus rau cov ntaub ntawv cov khoom hauv ib qho xaj uas yog inconsistent nrog lawv lub sij hawm stamps, ces ib tug ntawm lawv yog rho tawm.
Tom qab ntawd, lo lus nug yog, lub sijhawm ua haujlwm yog dab tsi?
Daim ntawv teev sijhawm yog tus cim tshwj xeeb tsim los ntawm DBMS los txheeb xyuas cov txheeb ze pib lub sijhawm ntawm a kev pauv nyiaj . Feem ntau, daim ntawv teev sijhawm tus nqi raug muab tso rau hauv qhov kev txiav txim uas kev lag luam raug xa mus rau qhov system. Yog li ntawd, a daim ntawv teev sijhawm tuaj yeem xav tias yog tus kev pauv nyiaj pib lub sij hawm.
Dab tsi yog kev siv lub sij hawm teev cov txheej txheem hauv cov ntaub ntawv faib tawm?
Daim ntawv teev sijhawm -based concurrency tswj algorithms siv kev pauv nyiaj daim ntawv teev sijhawm txhawm rau sib koom ua ke nkag mus rau ib qho khoom siv los xyuas kom meej serializability. A daim ntawv teev sijhawm yog ib tug cim identifier muab los ntawm DBMS mus rau ib qho kev lag luam uas sawv cev rau lub sijhawm pib ntawm kev sib pauv.
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