Video: Cassandra hom database yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cassandra - Taw qhia. Apache Cassandra yog ib qho scalable, ua haujlwm siab faib database tsim los tswj cov ntaub ntawv loj thoob plaws ntau cov khoom lag luam servers, muab cov khoom muaj ntau yam tsis muaj ib qho kev ua tsis tiav. Nws yog ib hom ntawm NoSQL database.
Yog li ntawd, hom DB yog Cassandra?
NoSQL database
Tsis tas li ntawd, leej twg siv Cassandra DB? Cassandra yog nyob rau hauv siv ntawm Constant Contact, CERN, Comcast, eBay, GitHub, GoDaddy, Hulu, Instagram, Intuit, Netflix, Reddit, Huab Cua Channel, thiab tshaj 1500 ntau lub tuam txhab uas muaj loj, nquag cov ntaub ntawv teeb.
Ntawm no, Cassandra puas yog columnar database?
Cassandra tsis yog a columnar database . Qhov no yog ib kem uas spans ntau los yog tag nrho cov kab nyob ntawm seb, los yog li cas, koj qhia partitions thiab dab tsi cov database txhawb nqa. Cassandra yog ib kem-tsev neeg* khw. Ib lub khw-tsev neeg ua kom cov ntaub ntawv hauv cheeb tsam ntawm qib muab faib, tsis yog qib kab.
Cassandra database ua haujlwm li cas?
Cassandra yog ib tug peer-to-peer faib system ua los ntawm ib pawg ntawm cov node nyob rau hauv uas ib tug node txais tau ib tug nyeem los yog sau ntawv thov. Zoo ib yam li Amazon's Dynamo DB , txhua qhov ntawm cov pawg sib txuas lus hauv lub xeev cov ntaub ntawv hais txog nws tus kheej thiab lwm cov nodes siv cov kev sib txuas lus ntawm cov phooj ywg rau cov phooj ywg.
Pom zoo:
Lub hom phiaj ntawm hom lus hom lus yog dab tsi?
Hom Lus Specification. Ib Hom Lus Qhia Tshwj Xeeb (CLS) yog ib daim ntawv uas hais tias yuav ua li cas cov khoos phis tawj tuaj yeem hloov mus rau hauv Cov Lus Qhia Nruab Nrab (CIL) code. Thaum ntau hom lus siv tib bytecode, qhov sib txawv ntawm qhov kev pab cuam tuaj yeem sau ua hom lus sib txawv
Dab tsi yog super hom thiab sub hom?
Lub supertype yog ib hom kev sib koom ua ke uas muaj kev sib raug zoo nrog ib lossis ntau hom subtypes. Ib tug subtype yog ib pawg sub-pab pawg ntawm cov koom haum hauv ib lub koom haum uas muaj txiaj ntsig rau lub koom haum thiab uas qhia cov yam ntxwv sib xws lossis kev sib raug zoo sib txawv ntawm lwm pab pawg
Dab tsi yog qhov txawv ntawm Hom C thiab Hom F ntsaws?
Hom F zoo ib yam li C tshwj tsis yog tias nws nyob ib puag ncig thiab muaj qhov sib ntxiv ntawm ob qhov txuas hauv av ntawm sab ntawm lub ntsaws. Hom C plug haum zoo kawg nkaus rau hauv lub qhov (socket) typeF. Lub qhov (socket) yog recessed los ntawm 15 hli, yog li ib feem ntawm cov ntsaws ntsaws tsis tuaj yeem ua rau poob siab
Social engineering yog dab tsi thiab nws lub hom phiaj yog dab tsi?
Social engineering yog lo lus siv rau ntau yam kev ua phem ua phem uas ua tiav los ntawm tib neeg kev sib cuam tshuam. Nws siv kev puas siab puas ntsws los ntxias cov neeg siv kom ua yuam kev kev ruaj ntseg lossis muab cov ntaub ntawv rhiab
Dab tsi yog tus hais lus sau nws lub hom phiaj thiab dab tsi yog yam tseem ceeb uas yuav tsum nco ntsoov txog cov lus hais?
Cov neeg hais lus sau ntawv yog cov ntawv qhia uas tus neeg nthuav qhia siv thaum nthuav qhia qhov kev nthuav qhia. Lawv pab tus neeg nthuav qhia nco txog cov ntsiab lus tseem ceeb thaum muab kev nthuav qhia. Lawv tshwm sim ntawm tus swb thiab tuaj yeem pom tsuas yog los ntawm tus tshaj tawm thiab tsis yog cov neeg tuaj saib