{"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\/sq\/blog\/novosti-interneta\/razrabotchiki-sqlite-razvivayut-bekend-hc-tree-s-podderzhkoj-parallelnyh-operaczij-zapisi","title":{"rendered":"Zhvilluesit e SQLite po zhvillojn\u00eb backend HC-tree me mb\u00ebshtetje p\u00ebr operacione t\u00eb shkruara paralele","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Zhvilluesit e projektit SQLite filluan testimin e nj\u00eb backend-i eksperimental HCtree, i cili mb\u00ebshtet bllokimin n\u00eb nivelin e rreshtave (row) dhe siguron nj\u00eb nivel t\u00eb lart\u00eb t\u00eb paralelizmit gjat\u00eb p\u00ebrpunimit t\u00eb k\u00ebrkesave. Backend-i i ri synon t\u00eb rris\u00eb efikasitetin e p\u00ebrdorimit t\u00eb SQLite n\u00eb sistemet klient-server, ku duhet t\u00eb p\u00ebrpunohen shum\u00eb k\u00ebrkesa t\u00eb nj\u00ebkohshme p\u00ebr shkruarje n\u00eb baz\u00ebn e t\u00eb dh\u00ebnave.       <\/p>\n<p>Strukturat b-tree, q\u00eb n\u00eb fillim ishin p\u00ebrdorur n\u00eb SQLite p\u00ebr ruajtjen e t\u00eb dh\u00ebnave, nuk jan\u00eb t\u00eb dizajnuara p\u00ebr k\u00ebt\u00eb lloj ngarkese, \u00e7ka e kufizon SQLite n\u00eb mund\u00ebsin\u00eb e shkruarjes vet\u00ebm n\u00eb nj\u00eb rrjedh\u00eb. Si nj\u00eb eksperiment, zhvilluesit filluan t\u00eb zhvillojn\u00eb nj\u00eb zgjidhje alternative q\u00eb p\u00ebrdor struktur\u00ebn HC-tree p\u00ebr ruajtjen, e cila \u00ebsht\u00eb m\u00eb e p\u00ebrshtatshme p\u00ebr paralelizmin e operacioneve t\u00eb shkruarjes.      <\/p>\n<p>P\u00ebr t\u00eb organizuar ekzekutimin e shumic\u00ebs s\u00eb operacioneve n\u00eb HCtree, aplikohet nj\u00eb mekaniz\u00ebm p\u00ebr ndarjen e transaksioneve, i cili p\u00ebrdor bllokime n\u00eb nivelin e faqeve dhe \u00ebsht\u00eb i ngjash\u00ebm me MVCC (menaxhimi me shum\u00eb versione i qasjes konkuruese), por p\u00ebrdor kontrollin e transaksioneve t\u00eb bazuara n\u00eb \u00e7el\u00ebsa dhe grupe \u00e7el\u00ebsash n\u00eb vend t\u00eb grupeve t\u00eb faqeve. Operacionet e leximit dhe shkrimit kryhen n\u00eb lidhje me snapshot-in e DB-s\u00eb, nd\u00ebrsa ndryshimet b\u00ebhen t\u00eb dukshme n\u00eb DB-n\u00eb kryesore vet\u00ebm pas p\u00ebrfundimit t\u00eb transaksionit.     <\/p>\n<p>Klient\u00ebt mund t\u00eb p\u00ebrdorin tre operacione p\u00ebr hapjen e transaksioneve:   <\/p>\n<ul>\n<li class=\"l\"> &#171;BEGIN&#187; &#8212; \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u043d\u0435 \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0442 \u0434\u0430\u043d\u043d\u044b\u0435 \u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0434\u0440\u0443\u0433\u0438\u0445 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u0432. \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432\u043d\u0443\u0442\u0440\u0438 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u044f \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0437\u0430\u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0435\u0441\u043b\u0438 \u0437\u0430 \u0432\u0440\u0435\u043c\u044f \u0435\u0451 \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043d\u0435 \u0431\u044b\u043b\u043e \u0434\u0440\u0443\u0433\u0438\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0432 \u0411\u0414.\n<li class=\"l\"> &#171;BEGIN CONCURRENT&#187; &#8212;  \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u0441\u043e\u0431\u0438\u0440\u0430\u044e\u0442 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0434\u0440\u0443\u0433\u0438\u0445 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u0432. \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432\u043d\u0443\u0442\u0440\u0438 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u044f \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0437\u0430\u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0435\u0441\u043b\u0438 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0441\u043d\u0430\u043f\u0448\u043e\u0442\u0430 \u0432 \u0411\u0414 \u0431\u044b\u043b\u0438 \u0437\u0430\u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u0434\u0440\u0443\u0433\u0438\u0435 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438.\n<li class=\"l\"> &#171;BEGIN EXCLUSIVE&#187; &#8212; \u043f\u043e\u0441\u043b\u0435 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u044f \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u0443\u0435\u0442 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0438\u0437 \u0434\u0440\u0443\u0433\u0438\u0445 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0439 \u0434\u043e \u0441\u0432\u043e\u0435\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f.    <\/ul>\n<p>HCtree \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u0442 \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u044e \u0432 \u0441\u0442\u0438\u043b\u0435 &#171;master-slave&#187;, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u0438\u0442\u044c \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u0432 \u0434\u0440\u0443\u0433\u0443\u044e \u0411\u0414 \u0438 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0442\u044c \u0432\u0442\u043e\u0440\u0438\u0447\u043d\u044b\u0435 \u0411\u0414 \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438, \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0441 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0411\u0414. HCtree \u0442\u0430\u043a\u0436\u0435 \u0441\u043d\u0438\u043c\u0430\u0435\u0442 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u0411\u0414 &#8212; \u0432\u043c\u0435\u0441\u0442\u043e 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0445 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 HCtree \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f 48 \u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0435, \u0447\u0442\u043e \u043f\u043e\u0432\u044b\u0448\u0430\u0435\u0442 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0440\u0430\u0437\u043c\u0435\u0440 \u0411\u0414 \u0441 16 \u0442\u0435\u0431\u0438\u0431\u0430\u0439\u0442 \u0434\u043e 1 \u044d\u043a\u0441\u0431\u0438\u0431\u0430\u0439\u0442 (\u043c\u0438\u043b\u043b\u0438\u043e\u043d \u0442\u0435\u0431\u0438\u0431\u0430\u0439\u0442). \u041e\u0436\u0438\u0434\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c SQLite \u0441 \u0431\u044d\u043a\u0435\u043d\u0434\u043e\u043c HCtree \u0431\u0443\u0434\u0435\u0442 \u043d\u0435 \u043d\u0438\u0436\u0435 \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043e\u0434\u043d\u043e\u043f\u043e\u0442\u043e\u0447\u043d\u043e\u0433\u043e \u0431\u044d\u043a\u0435\u043d\u0434\u0430.  \u041a\u043b\u0438\u0435\u043d\u0442\u044b SQLite \u0441 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 HCtree \u0441\u043c\u043e\u0433\u0443\u0442 \u043e\u0431\u0440\u0430\u0449\u0430\u0442\u044c\u0441\u044f \u043a\u0430\u043a \u043a \u0411\u0414 \u043d\u0430 \u0431\u0430\u0437\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b HC-tree, \u0442\u0430\u043a \u0438 \u043a \u0441\u0442\u0430\u0440\u044b\u043c \u0411\u0414 SQLite.<br \/>\n<br \/>Burimi: <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 \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 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