V\u00fdvoj\u00e1ri projektu SQLite za\u010dali testovanie experiment\u00e1lneho backendu HCtree, ktor\u00fd podporuje zamykanie na \u00farovni riadkov (row) a zabezpe\u010duje vysok\u00fa \u00farove\u0148 paraleliz\u00e1cie pri spracovan\u00ed po\u017eiadaviek. Nov\u00fd backend m\u00e1 za cie\u013e zlep\u0161i\u0165 efekt\u00edvnos\u0165 vyu\u017eitia SQLite v klient-serverov\u00fdch syst\u00e9moch, kde je potrebn\u00e9 spracov\u00e1va\u0165 ve\u013ek\u00e9 mno\u017estvo s\u00fabe\u017en\u00fdch po\u017eiadaviek na z\u00e1pis do DB. <\/p>\n
\u0160trukt\u00fary b-tree, p\u00f4vodne pou\u017e\u00edvan\u00e9 v SQLite na ukladanie \u00fadajov, nie s\u00fa prisp\u00f4soben\u00e9 na tak\u00fdto typ za\u0165a\u017eenia, \u010do obmedzuje SQLite na z\u00e1pis len v jednom vl\u00e1kne. Ako experiment sa v\u00fdvoj\u00e1ri za\u010dali zaobera\u0165 alternat\u00edvnym rie\u0161en\u00edm, ktor\u00e9 pou\u017e\u00edva na ukladanie \u0161trukt\u00faru HC-tree, vhodnej\u0161iu na paraleliz\u00e1ciu zapisovac\u00edch oper\u00e1ci\u00ed. <\/p>\n
Na organiz\u00e1ciu s\u00fabe\u017en\u00e9ho vykon\u00e1vania viacer\u00fdch oper\u00e1ci\u00ed v HCtree zapisuje sa mechanizmus rozdelenia transakci\u00ed, ktor\u00fd pou\u017e\u00edva zamykanie na \u00farovni str\u00e1n a je podobn\u00fd MVCC (multi-version concurrency control), ale pou\u017e\u00edva kontroly transakci\u00ed zalo\u017een\u00e9 na k\u013e\u00fa\u010doch a intervaloch k\u013e\u00fa\u010dov namiesto mno\u017e\u00edn str\u00e1n. Oper\u00e1cie \u010d\u00edtania a z\u00e1pisu s\u00fa vykon\u00e1van\u00e9 v s\u00favislosti so snapshotom DB, ktor\u00fdch zmeny s\u00fa vidite\u013en\u00e9 v hlavnej DB len po dokon\u010den\u00ed transakcie. <\/p>\n
Klienti m\u00f4\u017eu pou\u017e\u00edva\u0165 tri oper\u00e1cie na otvorenie transakci\u00ed: <\/p>\n
HCtree podporuje replik\u00e1ciu v \u0161t\u00fdle \u201emaster-slave\u201c, ktor\u00e1 umo\u017e\u0148uje pren\u00e1\u0161a\u0165 transakcie do inej datab\u00e1zy a udr\u017eiava\u0165 sekund\u00e1rne datab\u00e1zy v stave synchronizovanom s hlavnou datab\u00e1zou. HCtree tie\u017e odstra\u0148uje obmedzenie na ve\u013ekos\u0165 datab\u00e1zy \u2014 namiesto 32-bitov\u00fdch identifik\u00e1torov str\u00e1nok d\u00e1t sa v HCtree pou\u017e\u00edvaj\u00fa 48-bitov\u00e9, \u010do zvy\u0161uje maxim\u00e1lnu ve\u013ekos\u0165 datab\u00e1zy zo 16 tebibajtov na 1 exbibajt (mili\u00f3n tebibajtov). O\u010dak\u00e1va sa, \u017ee v\u00fdkon SQLite s backendom HCtree bude minim\u00e1lne rovn\u00fd klasick\u00e9mu jednor\u00e1zov\u00e9mu backendu. Klienti SQLite s podporou HCtree bud\u00fa m\u00f4c\u0165 pristupova\u0165 ako k datab\u00e1zam na b\u00e1ze \u0161trukt\u00fary HC-tree, tak aj k star\u00fdm datab\u00e1zam SQLite. \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\udd47V\u00fdvoj\u00e1ri SQLite vyv\u00edjaj\u00fa backend HC-tree s podporou paraleln\u00fdch oper\u00e1ci\u00ed z\u00e1pisu | ProHoster","description":"V\u00fdvoj\u00e1ri projektu SQLite za\u010dali testovanie experiment\u00e1lneho backendu HCtree, ktor\u00fd podporuje zamykanie na \u00farovni riadkov (row) a zabezpe\u010duje vysok\u00fa \u00farove\u0148 paraleliz\u00e1cie pri spracovan\u00ed 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\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.","og:url":"https:\/\/prohoster.info\/sk\/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\/sk\/wp-json\/wp\/v2\/posts\/106417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/comments?post=106417"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/106417\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/media?parent=106417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/categories?post=106417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/tags?post=106417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"