A SQLite projekt fejleszt\u0151i megkezdt\u00e9k az HCtree k\u00eds\u00e9rleti backend tesztel\u00e9s\u00e9t, amely t\u00e1mogatja a sor szint\u0171 z\u00e1rol\u00e1st, \u00e9s magas fok\u00fa p\u00e1rhuzamos\u00edt\u00e1st biztos\u00edt a lek\u00e9rdez\u00e9sek feldolgoz\u00e1sa sor\u00e1n. Az \u00faj backend c\u00e9lja a SQLite hat\u00e9konys\u00e1g\u00e1nak n\u00f6vel\u00e9se kliens-szerver rendszerekben, ahol nagy sz\u00e1m\u00fa p\u00e1rhuzamos \u00edr\u00e1si k\u00e9r\u00e9st kell kezelni. <\/p>\n
Az SQLite-ban eredetileg haszn\u00e1lt b-fa strukt\u00far\u00e1k nem a hasonl\u00f3 terhel\u00e9sek kezel\u00e9s\u00e9re lettek tervezve, ami korl\u00e1tozza a SQLite \u00edr\u00e1si k\u00e9pess\u00e9g\u00e9t csup\u00e1n egy sz\u00e1lon. K\u00eds\u00e9rletk\u00e9nt a fejleszt\u0151k egy alternat\u00edv megold\u00e1s kidolgoz\u00e1s\u00e1ba kezdtek, amely az HC-tree strukt\u00far\u00e1kat haszn\u00e1lja az \u00edr\u00e1si m\u0171veletek p\u00e1rhuzamos\u00edt\u00e1s\u00e1ra. <\/p>\n
Az HCtree rendszerben a t\u00f6bb m\u0171velet p\u00e1rhuzamos v\u00e9grehajt\u00e1s\u00e1hoz egy tranzakci\u00f3s sz\u00e9tv\u00e1laszt\u00e1si mechanizmust alkalmaznak, amely lap szint\u0171 z\u00e1rol\u00e1sokat haszn\u00e1l, \u00e9s hasonl\u00f3 a MVCC-hez (t\u00f6bb verzi\u00f3s p\u00e1rhuzamos hozz\u00e1f\u00e9r\u00e9s kezel\u00e9s), de kulcsok \u00e9s kulcskateg\u00f3ri\u00e1k alap\u00fa tranzakci\u00f3-ellen\u0151rz\u00e9seket v\u00e9gez lapcsoportok helyett. Az olvas\u00e1si \u00e9s \u00edr\u00e1si m\u0171veletek a DB pillanatfelv\u00e9tel\u00e9hez k\u00f6t\u0151dnek, amelynek m\u00f3dos\u00edt\u00e1sai csak a tranzakci\u00f3 befejez\u00e9se ut\u00e1n v\u00e1lnak l\u00e1that\u00f3v\u00e1 a f\u0151 DB-ben. <\/p>\n
A kliensek h\u00e1rom tranzakci\u00f3nyit\u00e1si m\u0171veletet haszn\u00e1lhatnak: <\/p>\n
Az HCtree t\u00e1mogatja a \u201emaster-slave\u201d st\u00edlus\u00fa replik\u00e1ci\u00f3t, amely lehet\u0151v\u00e9 teszi a tranzakci\u00f3k \u00e1tvitel\u00e9t egy m\u00e1sik adatb\u00e1zisba, \u00e9s t\u00e1mogatja a m\u00e1sodlagos adatb\u00e1zisokat az els\u0151dleges adatb\u00e1zissal szinkroniz\u00e1lt \u00e1llapotban. Az HCtree elt\u00e1vol\u00edtja az adatb\u00e1zis m\u00e9ret\u00e9re vonatkoz\u00f3 korl\u00e1toz\u00e1st \u2013 a 32 bites adatoldal azonos\u00edt\u00f3k helyett 48 bites azonos\u00edt\u00f3k alkalmaz\u00e1s\u00e1val a maxim\u00e1lis adatb\u00e1zis m\u00e9rete 16 tebib\u00e1jtr\u00f3l 1 exbib\u00e1ytra (egymilli\u00f3 tebib\u00e1jtra) n\u0151. V\u00e1rhat\u00f3an az SQLite teljes\u00edtm\u00e9nye a HCtree h\u00e1tt\u00e9rrel nem lesz alacsonyabb, mint a klasszikus egysz\u00e1l\u00fa h\u00e1tt\u00e9r. Az HCtree t\u00e1mogat\u00e1ssal rendelkez\u0151 SQLite kliensek k\u00e9pesek lesznek hozz\u00e1f\u00e9rni mind a HC-tree strukt\u00far\u00e1ra \u00e9p\u00fcl\u0151 adatb\u00e1zisokhoz, mind a r\u00e9gi SQLite adatb\u00e1zisokhoz. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 SQLite \u043d\u0430\u0447\u0430\u043b\u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0431\u044d\u043a\u0435\u043d\u0434\u0430 HCtree, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0443 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0441\u0442\u0440\u043e\u043a (row) \u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0440\u0430\u0441\u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041d\u043e\u0432\u044b\u0439 \u0431\u044d\u043a\u0435\u043d\u0434 \u043d\u0430\u0446\u0435\u043b\u0435\u043d \u043d\u0430 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f SQLite \u0432 \u043a\u043b\u0438\u0435\u043d\u0442-\u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0442\u044c \u0431\u043e\u043b\u044c\u0448\u043e\u0435 \u0447\u0438\u0441\u043b\u043e \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043a \u0411\u0414 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b b-tree, \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0435 \u0432 SQLite \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-106417","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Az SQLite fejleszt\u0151i az HC-tree h\u00e1tt\u00e9r p\u00e1rhuzamos \u00edr\u00e1si m\u0171veletek t\u00e1mogat\u00e1s\u00e1val val\u00f3 fejleszt\u00e9s\u00e9n dolgoznak | ProHoster","description":"Az SQLite projekt fejleszt\u0151i megkezdt\u00e9k az \u00faj, HCtree h\u00e1tt\u00e9r tesztel\u00e9s\u00e9t, amely t\u00e1mogatja a sor szint\u0171 z\u00e1rol\u00e1st, \u00e9s magas fok\u00fa p\u00e1rhuzamos\u00edt\u00e1st 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\u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u044c\u043d\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 | ProHoster","og:description":"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 SQLite \u043d\u0430\u0447\u0430\u043b\u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0431\u044d\u043a\u0435\u043d\u0434\u0430 HCtree, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0443 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0441\u0442\u0440\u043e\u043a (row) \u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0432\u044b\u0441\u043e\u043a\u0438\u0439 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\u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/razrabotchiki-sqlite-razvivayut-bekend-hc-tree-s-podderzhkoj-parallelnyh-operaczij-zapisi","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-01-19T16:48:11+00:00","article:modified_time":"2023-01-24T11:52:43+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=106417"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106417\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=106417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=106417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=106417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"