Video: Acid hauv Hadoop yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
ACID sawv cev rau Atomicity, Consistency, Isolation, thiab Durability. Kev sib raug zoo ua kom ntseeg tau tias txhua qhov kev hloov pauv yuav coj cov ntaub ntawv los ntawm ib lub xeev siv tau mus rau lwm lub xeev. Kev cais tawm hais tias txhua qhov kev lag luam yuav tsum muaj kev ywj pheej ntawm ib leeg, piv txwv li ib qho kev lag luam yuav tsum tsis txhob cuam tshuam lwm tus.
Cov lus nug tseem yog, dab tsi yog acid nyob rau hauv cov ntaub ntawv loj?
Ua ntej, ACID yog ib qho acronym rau atomicity, sib xws, kev sib cais, thiab durability. Kev lag luam tswj xyuas qhov sib xws ntawm lub xeev ntawm cov cov ntaub ntawv . Hauv lwm lo lus, tom qab khiav kev lag luam, tag nrho cov ntaub ntawv nyob rau hauv lub database yog "yog." Kev rho tawm txhais tau hais tias kev lag luam tuaj yeem khiav tib lub sijhawm.
Tsis tas li ntawd, vim li cas acid ua raws li tseem ceeb? Ntawm no yog ib qho piv txwv ntawm lub ntiaj teb tiag: Kev ua raws li ACID Nws yog ib qho tseem ceeb rau cov tuam txhab nyiaj txiag vim tias nws tiv thaiv qhov teeb meem tsis zoo ntawm kev them nyiaj tib ob zaug vim kev ua lag luam tsis sib haum.
Tom qab ntawd, ib tus tuaj yeem nug, dab tsi yog ACID cov khoom hauv DBMS?
Kev lag luam hauv a database system yuav tsum tuav Atomicity, Consistency, Isolation, thiab Durability - feem ntau hu ua ACID cov khoom - txhawm rau xyuas kom raug, ua tiav, thiab cov ntaub ntawv ncaj ncees. Consistency - Kev database yuav tsum nyob twj ywm nyob rau hauv ib tug zoo lub xeev tom qab ib qho kev sib pauv.
Dab tsi yog acid thiab base hauv databases?
Database developers txhua tus paub cov ACID acronym. Nws hais tias database Kev hloov pauv yuav tsum yog: Atomic: Txhua yam hauv kev sib pauv ua tiav lossis tag nrho cov kev hloov pauv tau rov qab. Consistent: Ib qho kev sib pauv tsis tuaj yeem tawm ntawm qhov database nyob rau hauv ib qho kev tsis sib haum xeeb. Kev cais tawm: Kev lag luam tsis tuaj yeem cuam tshuam ib leeg.
Pom zoo:
Qhov thib ob Namenode hauv Apache Hadoop yog dab tsi?
Secondary NameNode nyob rau hauv hadoop yog ib qho tshwj xeeb ntawm node nyob rau hauv HDFS pawg uas nws lub luag haujlwm tseem ceeb yog los saib xyuas cov ntaub ntawv kaw lus metadata tam sim no ntawm namenode. Nws tsis yog ib tug backup namenode. Nws tsuas yog checkpoints namenode cov ntaub ntawv system namespace
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
Dab tsi yog txoj hauv kev virtual thiab txoj hauv lub cev hauv asp net?
Ua ntej tshaj, cia peb tau txais cov ntsiab lus ntawm ob qho tib si. Txoj kev lub cev - Qhov no yog txoj hauv kev tiag tiag cov ntaub ntawv nyob ntawm IIS. Txoj kev Virtual - Qhov no yog txoj hauv kev kom nkag mus rau cov ntaub ntawv uas tau taw qhia los ntawm sab nraud ntawm IIS daim ntawv thov folder
Dab tsi yog qhov tsis muaj dab tsi hauv Java?
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Yuav ua li cas sib tov boric acid hmoov nrog dej rau termites?
Rau kev siv sab hauv tsev, sib tov ib teaspoon ntawm boric acid nrog ib khob dej sov rau hauv lub raj mis huv. Co lub raj mis maj mam kom txog thaum cov hmoov yaj. Soak tag nrho cov cheeb tsam uas koj xav tias muaj kab mob. Rov ua dua txhua hnub rau peb mus rau tsib hnub, thiab tom qab ntawd tshawb nrhiav cov cim qhia tias muaj kab mob ntxiv lossis puas tsuaj