›Jigogee Isolation Levels sunan rufe? **Isolation levels** suna kontrola yadda jigogee (transactions) da ke aiki lokaci gida za su iya ganin canja-canja na juna na ba-karanta (ko na aiki) — suna saida **daidaituwa** akasin **aiki/haɗi**. Isolation mafi girma ya iya dakatar da anomalies da yawa amma yana kara kulle/rarrabawa. ## Concurrency anomalies (abin da isolation ya dakatar) [[CODE_1]] Waɗannan su ne matsalolin da zasu iya faruwa idan jigogee suna aiki a lokaci gida — isolation levels suna kontrola waɗanda aka dakatar. ## Dibbin hudu na isolation levels na standard [[CODE_2]] Kowanne matakin sama yana dakatar da anomalies da yawa. **Read Committed** shine babbar zaɓi (yana dakatar da dirty reads); **Serializable** shine mafi muni (jigogee suna aiki kamar ba lokaci gida ba) amma ya bukaci haɗi. ## Saita isolation level [[CODE_3]] ## Inganci na asali [[CODE_4]] ## Me ya sa ya bukaci Isolation levels na jigogee su ne mahimman ilimi na gida don fahimtar **concurrency a cikin databases** — lokacin da jigogee masu yawa suka yi aiki a lokaci gida (kamar yadda suke aiki a kowane aikace-aikacen masu mai users), isolation levels suna ƙayyade inganci-daidaituwa da aiki, don haka fahimtar su ya bukaci don gina aikace-aikacen daidai, aiki da haɗi. Ribobbin mahimman abubuwa su ne **concurrency anomalies** (dirty reads, non-repeatable reads, phantom reads — matsalolin da ke faruwa idan jigogee suka ga canja-canja na juna) da kuma yadda **dibbin hudu na isolation** (Read Uncommitted, Read Committed, Repeatable Read, Serializable) suna ƙare-ƙare dakatar da su. Fahimtar haka ya bukaci ga daidaituwa: zaɓin isolation mabas za ya iya ƙaushe anomalies da zasu ɓata bayanai ko samar da sakamakon ba daidai (alal misali karanta bayanai ba-karanta da jiya suka dogara, ko karanta ba-jiya), amma zaɓin sama yana rage haɗi da aiki. Babbattiyar **inganci na asali** — isolation sama yana nufin daidaituwa da yawa amma kulle/rarrabawa da yawa (haɗi mabas, saurin jiya karasa da deadlocks), isolation mabas yana nufin aiki amma haɗari na anomalies — shine masaniyar mahimma: kinka zaɓi matakin bisa abin da bayani ke buƙatar (bayanai na mahimmanci/kuɗi na iya bukatar Serializable; jumhuriyar aikace-aikace suna amfani da Read Committed a matsayin daidaituwa). Sanin cewa abubuwan suna bambanta (MVCC akasin kulle) ya bukaci ma. Tun concurrency yana nan a gaida a cikin aikace-aikace na bayani na ainihi, da tun isolation levels suna ƙayyade daidaituwa-mahimma tsakanin daidaituwa da aiki (zaɓin ba daidai zai kawo da anomalies ko aiki matsaloli), fahimtar isolation levels — anomalies, matakin, da inganci-da-concurrency trade-off — shi ne ilimi na babbar matakin da ke bukaci don gina daidai, aiki da haɗi da cikakke da gida jiya kaɗai gajiya ne na interviews.Senior#BayanaiBayanai →
