{"id":106417,"date":"2023-01-19T18:48:11","date_gmt":"2023-01-19T16:48:11","guid":{"rendered":"https:\/\/prohoster.info\/?p=106417"},"modified":"2023-01-24T13:52:43","modified_gmt":"2023-01-24T11:52:43","slug":"razrabotchiki-sqlite-razvivayut-bekend-hc-tree-s-podderzhkoj-parallelnyh-operaczij-zapisi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/razrabotchiki-sqlite-razvivayut-bekend-hc-tree-s-podderzhkoj-parallelnyh-operaczij-zapisi","title":{"rendered":"SQLite arendajad arendavad HC-tree tagapinda koos paralleelsete kirjutamisoperatsioonide toega.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>SQLite projekti arendajad alustasid eksperimentaalse HCtree tagaplaneeringu testimist, mis toetab ridade (row) tasemel lukustamist ja tagab k\u00f5rge paralleelsuse p\u00e4ringute t\u00f6\u00f6tlemisel. Uus tagaplaneering on suunatud SQLite efektiivsuse suurendamisele kliendiserveri s\u00fcsteemides, kus tuleb t\u00f6\u00f6delda suurt hulka samal ajal toimuvaid andmebaasi kirjutamis p\u00e4ringuid.       <\/p>\n<p>SQLite algselt andmete salvestamiseks kasutatavad b-tree struktuurid ei ole selliseks koormuseks m\u00f5eldud, mis piirab SQLite kirjutamisv\u00f5imet ainult \u00fche voolu kaupa. Eksperimendi raames hakkasid arendajad arendama alternatiivset lahendust, mis kasutab andmete salvestamiseks HC-tree struktuure, mis on paremini sobilikud kirjutamisoperatsioonide paralleelseteks toiminguteks.      <\/p>\n<p>HCtree'i salvestustes kasutatakse mitme toimingu samaaegseks t\u00e4itmiseks tehingute eraldamise mehhanismi, mis rakendab lehek\u00fclje tasemel lukustusi ja sarnaneb MVCC (mitme versiooni konkurentsi kontrollimise) s\u00fcsteemiga, kuid kasutab tehingute kontrollimist p\u00f5hjalikul ja v\u00f5tmevahemiku alusel, mitte lehek\u00fclgede komplektide kaudu. Lugemise ja kirjutamise toimingud toimuvad andmebaasi snapshots'iga seotult ning muudatused muutuvad peamises andmebaasis n\u00e4htavaks alles p\u00e4rast tehingu l\u00f5petamist.     <\/p>\n<p>Kliendid saavad kasutada kolme tehingu avamise toimingut:   <\/p>\n<ul>\n<li class=\"l\"> &#171;BEGIN&#187; &#8212; tehingud ei arvesse teiste klientide juurdep\u00e4\u00e4suandmeid. Kui tehingu raames tehakse kirjutamisoperatsioone, saa tehing lukustada vaid juhul, kui selle toimumise ajal ei olnud andmebaasis teisi kirjutamisoperatsioone.\n<li class=\"l\"> &#171;BEGIN CONCURRENT&#187; &#8212; tehingud koguvad teavet teiste klientide juurdep\u00e4\u00e4su kohta. Kui tehingu raames tehakse kirjutamisoperatsioone, saab tehing lukustada, kui andmebaasis on teised tehingud fikseerimise k\u00e4igus alates sisendi loomise hetkest.\n<li class=\"l\"> &#171;BEGIN EXCLUSIVE&#187; &#8212; tehingu avamisel blokeerib see teised tehingud kuni selle l\u00f5petamiseni.    <\/ul>\n<p>HCtree toetab &#171;master-slave&#187; replikatsiooni, mis v\u00f5imaldab tehingute edastamist teise andmebaasi ja hoida teisi andmebaase peamise andmebaasiga s\u00fcnkroonis. HCtree kaotab andmebaasi suuruse piiri &#8212; 32-bitiste andmehaldusidentifikaatorite asemel kasutatakse HCtree's 48-bitiseid, mis suurendab andmebaasi maksimaalse suuruse 16 tebibaidist kuni 1 eksbibaidini (miljon tebibaidi). Eeldatakse, et SQLite t\u00f6\u00f6j\u00f5udluse tase HCtree tagamiseks ei j\u00e4\u00e4 klassikalisest \u00fchesuunalisest tagamise tasemest alla. SQLite kliendid, kes toetavad HCtree-d, saavad ligip\u00e4\u00e4su nii HC-tree struktuuri kui ka vanadele SQLite andmebaasidele.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58508\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 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[&hellip;]<\/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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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, 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taseme lukustamist ja tagab k\u00f5rge taseme paljususes p\u00e4ringute t\u00f6\u00f6tlemisel. Uus tagaplaan on suunatud SQLite efektiivsuse suurendamisele kliendi-serveri s\u00fcsteemides, kus tuleb t\u00f6\u00f6tlema suure hulga \u00fcheaegseid andmebaasi kirjutamisp\u00e4ringuid. B-tree struktuurid, mida algselt kasutatakse SQLite andmete salvestamiseks, ei","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/razrabotchiki-sqlite-razvivayut-bekend-hc-tree-s-podderzhkoj-parallelnyh-operaczij-zapisi","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 SQLite \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0442 \u0431\u044d\u043a\u0435\u043d\u0434 HC-tree \u0441 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 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