Video: SQL database khaws cia nyob qhov twg?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhov system database cov ntaub ntawv rau cov database yog khaws cia nyob rau hauv cov neeg siv lub zos AppData txoj kev uas ib txwm muab zais. Piv txwv li C:Users--user--AppDataLocalMicrosoftMicrosoft SQL ntawv Server Local DB InstancesLocalDBApp1.
Tsis tas li ntawd, cov ntaub ntawv khaws cia nyob qhov twg?
Database cov ntxhuav thiab indexes yuav yog khaws cia ntawm disk hauv ib qho ntawm ntau cov ntaub ntawv, suav nrog cov ntawv xaj / tsis muaj cov ntaub ntawv tiaj tus, ISAM, cov ntaub ntawv heap, hash thoob, lossis B + ntoo.
Ib sab saum toj no, SQL cov ntaub ntawv khaws cia nyob qhov twg? Los ntawm lub neej ntawd, qhov yuam kev log yog nyob ntawm Program FilesMicrosoft SQL ntawv ServerMSSQL. n MSSQL LOG ERRORLOG thiab ERRORLOG.
Ib yam li ntawd, tib neeg nug, SQL databases khaws Linux nyob qhov twg?
1 Teb. MySQL khw muag khoom DB cov ntaub ntawv hauv /var/lib/mysql los ntawm lub neej ntawd, tab sis koj tuaj yeem hla qhov no hauv cov ntaub ntawv teeb tsa, feem ntau hu ua /etc/my. cnf, txawm tias Debian hu nws /etc/mysql/my.
Puas yog database khaws cia?
Database yog qee yam kev txhim kho cov ntaub ntawv khaws cia yog ib lub khw muag khoom. yog los ntawm khaws cia , koj txhais tau tias s3 hom khaws cia , nws txhais tau tias khaws cov khoom zoo li, xws li cov ntawv nyeem, cov duab thiab lwm yam A database yog npaj rau cov ntaub ntawv tsim los yog semi-structured. xws li IDs, cov ntaub ntawv, cov ntaub ntawv hloov pauv.
Pom zoo:
Cov txheej txheem khaws cia nyob qhov twg hauv SQL Server?
Cov txheej txheem khaws cia (sp) yog ib pawg ntawm SQL thov, khaws cia rau hauv cov ntaub ntawv. Hauv SSMS, lawv tuaj yeem pom nyob ze ntawm lub rooj. Qhov tseeb ntawm software architecture, nws yog qhov zoo dua los khaws cov lus T-SQL rau hauv cov ntaub ntawv, vim hais tias yog ib theem hloov yuav tsis tas yuav hloov lwm yam
Lub ntiaj teb ib ntus cov lus khaws cia hauv SQL Server nyob qhov twg?
Cov ntxhuav thoob ntiaj teb ib ntus rau SQL Server (pib nrog ## lub npe lub rooj) tau khaws cia hauv tempdb thiab sib koom ntawm txhua tus neeg siv cov kev sib tham thoob plaws tag nrho SQL Server piv txwv. Azure SQL Database txhawb nqa thoob ntiaj teb cov lus ib ntus uas tseem khaws cia hauv tempdb thiab tau muab faib rau qib database
Kuv qhov kos npe digital khaws cia nyob qhov twg?
Koj tuaj yeem nrhiav tau daim ntawv pov thawj digital-ID tsim hauv Acrobat hauv /User / [username]/AppData/Roaming/Adobe/Acrobat/11.0/Securitydirectory. Yog tias kos npe muaj ib daim duab cov ntaub ntawv nws muab khaws cia rau hauv cov ntaub ntawv hu ua qhov tshwm sim
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
Postgres database khaws cia nyob qhov twg?
Kev lig kev cai, kev teeb tsa thiab cov ntaub ntawv cov ntaub ntawv siv los ntawm pawg database tau muab khaws cia ua ke hauv pawg cov ntaub ntawv teev npe, feem ntau hu ua PGDATA (tom qab lub npe ntawm ib puag ncig hloov pauv uas tuaj yeem siv los txhais nws). Ib qho chaw nyob rau PGDATA yog /var/lib/pgsql/data