Video: BTMP cov ntaub ntawv yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
ua, wtmp, btmp ua thiab variants xws li utmpx, wtmpx thiab btmpx yog cov ntaub ntawv ntawm Unix-zoo li tshuab uas khaws txhua qhov kev nkag thiab tawm mus rau qhov system.
Tom qab ntawd, BTMP sawv cev rau dab tsi?
Tshaj xov xwm Technology Management Production
Dab tsi yog siv Wtmp thiab UTMP cov ntaub ntawv? /var/log/ wtmp ua Qhov no ntaub ntawv zoo li keeb kwm rau utmp cov ntaub ntawv , i.e. nws tuav lub cav ntawm txhua tus neeg siv nkag thiab tawm hauv cov neeg siv (yav dhau los). Cov lus txib kawg siv qhov no ntaub ntawv los tso saib cov npe ntawm cov neeg siv nkag mus dhau los. Cov wtmp ua sau tag nrho cov logins thiab logouts.
Tsis tas li ntawd, Wtmp file yog dab tsi?
Wtmp yog a ntaub ntawv ntawm Linux, Solaris, thiab BSD operating systems uas khaws keeb kwm ntawm txhua qhov kev nkag thiab tawm. Ntawm Linux systems, nws nyob ntawm /var/log/ wtmp ua . Ntau cov lus txib nkag wtmp ua los tshaj tawm cov txheeb cais nkag, suav nrog cov lus txib leej twg thiab kawg. Log, Operating system, Operating System cov ntsiab lus.
Dab tsi yog qhov var muab faib feem ntau siv rau?
/ var yog tus qauv subdirectory ntawm lub hauv paus directory hauv Linux thiab lwm yam Unix-zoo li kev khiav hauj lwm systems uas muaj cov ntaub ntawv uas lub kaw lus sau cov ntaub ntawv thaum lub sij hawm nws ua hauj lwm.
Pom zoo:
Cov ntaub ntawv hom thiab cov qauv ntaub ntawv yog dab tsi?
Cov qauv ntaub ntawv yog ib txoj hauv kev piav qhia txog ib txoj hauv kev los npaj cov ntaub ntawv kom ua haujlwm andalogrithms tuaj yeem siv tau yooj yim dua. Ib hom ntaub ntawv piav qhia txog cov ntaub ntawv uas txhua tus sib koom ua ke. Piv txwv li tus lej cov ntaub ntawv hom piav qhia txhua tus lej uas lub khoos phis tawj tuaj yeem ua tau
Dab tsi yog qhov txawv ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb?
Qhov sib txawv loj ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb Ib daim ntawv XML muaj cov ntaub ntawv hais txog kev sib raug zoo ntawm cov ntaub ntawv rau ib leeg nyob rau hauv daim ntawv ntawm hierarchy. Nrog rau tus qauv kev sib raug zoo, tib hom kev sib raug zoo uas tuaj yeem txhais tau yog cov lus niam txiv thiab cov rooj sib raug zoo
Dab tsi yog qhov sib txawv ntawm pab pawg cov ntaub ntawv thiab cov ntaub ntawv tsis yog pawg?
Ob leeg yog cov ntaub ntawv muaj txiaj ntsig ntawm cov ntaub ntawv tab sis qhov sib txawv ntawm lawv yog cov ntaub ntawv tsis muaj ntaub ntawv yog rawdata. Qhov no txhais tau hais tias nws nyuam qhuav tau sau tab sis tsis txheeb rau hauv ib pawg lossis cov chav kawm. Ntawm qhov tod tes, groupeddata yog cov ntaub ntawv uas tau teeb tsa ua pawg los ntawm cov ntaub ntawv nyoos
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi yog cov teeb meem ntawm kev tswj cov ntaub ntawv hauv cov ntaub ntawv ib txwm muaj?
Nyob rau tib lub sijhawm, qhov kev tswj hwm cov ntaub ntawv ib puag ncig tsim teeb meem xws li cov ntaub ntawv rov ua dua thiab tsis sib xws, cov kev pab cuam-cov ntaub ntawv dependence, inflexibility, tsis muaj kev ruaj ntseg, thiab tsis muaj cov ntaub ntawv sib qhia thiab muaj