{"id":121799,"date":"2025-02-10T15:46:10","date_gmt":"2025-02-10T13:46:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opublikovana-raspredelyonnaya-subd-citus-13-0"},"modified":"2025-02-10T15:46:10","modified_gmt":"2025-02-10T13:46:10","slug":"opublikovana-raspredelyonnaya-subd-citus-13-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/opublikovana-raspredelyonnaya-subd-citus-13-0","title":{"rendered":"Bol uvo\u013enen\u00fd distribuovan\u00fd datab\u00e1zov\u00fd syst\u00e9m Citus 13.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Spolo\u010dnos\u0165 Citus Data, ktor\u00e1 patr\u00ed Microsoftu, zverejnila distribuovan\u00fa datab\u00e1zu Citus 13.0, implementovan\u00fa ako roz\u0161\u00edrenie pre PostgreSQL 17. Citus zabezpe\u010duje horizont\u00e1lne \u0161k\u00e1lovanie PostgreSQL v clustre na z\u00e1klade \u0161tandardn\u00e9ho hardv\u00e9ru a umo\u017e\u0148uje rozlo\u017eenie d\u00e1t po uzloch prostredn\u00edctvom shardovania s nastaven\u00edm delenia na \u00farovni st\u013apcov a sch\u00e9my ukladania. Pre aplik\u00e1cie vyzer\u00e1 klaster Citus ako jeden ve\u013ek\u00fd server PostgreSQL, ktor\u00fd sp\u00e1ja zdroje jeho uzlov. K\u00f3d je nap\u00edsan\u00fd v jazyku C a je distribuovan\u00fd pod licenciou AGPLv3.      <\/p>\n<p>Shardovanie umo\u017e\u0148uje organizova\u0165 ukladanie ve\u013emi ve\u013ek\u00fdch objemov d\u00e1t, ktor\u00fdch celkov\u00e1 ve\u013ekos\u0165 v\u00fdrazne presahuje lok\u00e1lne \u00falo\u017eisk\u00e1 ka\u017ed\u00e9ho z uzlov klastra. Samostatn\u00e9 tabu\u013eky m\u00f4\u017eu by\u0165 n\u00fatene replikovan\u00e9 na v\u0161etky uzly na ur\u00fdchlenie vykon\u00e1vania oper\u00e1ci\u00ed zl\u00fa\u010denia a pr\u00e1ce s extern\u00fdmi k\u013e\u00fa\u010dmi. Pre \u00fasporu diskov\u00e9ho priestoru m\u00f4\u017eu by\u0165 distribuovan\u00e9 d\u00e1ta ulo\u017een\u00e9 v komprimovanej forme.       <\/p>\n<p>Distribuovan\u00e9 dotazy m\u00f4\u017eu by\u0165 zasielan\u00e9 na ktor\u00fdko\u013evek z uzlov klastra, ale spr\u00e1va a zmeny sch\u00e9my \u00fadajov by sa mali vykon\u00e1va\u0165 iba prostredn\u00edctvom uzla, ktor\u00fd koordinuje pr\u00e1cu klastra. Po\u017eiadavky od klientov s\u00fa rozde\u013eovan\u00e9 na potrebn\u00e9 uzly a ak pokr\u00fdvaj\u00fa nieko\u013eko uzlov, ich spracovanie je paralelizovan\u00e9. Klaster je mo\u017en\u00e9 roz\u0161\u00edri\u0165 v z\u00e1vislosti od rastu objemu ulo\u017een\u00fdch d\u00e1t pridan\u00edm \u010fal\u0161\u00edch uzlov a iniciovan\u00edm rebalance.     <\/p>\n<p>Ako typick\u00e9 pr\u00edklady pou\u017eitia Citus sa uv\u00e1dza vykon\u00e1vanie analytick\u00fdch dotazov a spracovanie ve\u013ek\u00fdch objemov d\u00e1t vo forme \u010dasov\u00e9ho radu (napr\u00edklad logy alebo dotaz na stav senzorov). Citus je tie\u017e vhodn\u00fd na moderniz\u00e1ciu existuj\u00facej infra\u0161trukt\u00fary zalo\u017eenej na jednotlivom <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sk\/server\/dts-los-angeles\/\"   title=\"servera\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3899\">servera<\/a> PostgreSQL, ktor\u00e9ho v\u00fdkon a \u00falo\u017eisk\u00e1 prestali posta\u010dova\u0165 z d\u00f4vodu zvy\u0161ovania za\u0165a\u017eenia alebo objemu prich\u00e1dzaj\u00facich d\u00e1t. S pomocou n\u00e1stroja Patroni je mo\u017en\u00e9 vytv\u00e1ra\u0165 vysoko dostupn\u00e9 konfigur\u00e1cie s replikovan\u00fdmi z\u00e1lo\u017en\u00fdmi uzlami, schopn\u00fdmi v pr\u00edpade zlyhania zaber\u00e9 miesto hlavn\u00fdch uzlov.      <\/p>\n<p>Zmeny v vydan\u00ed Citus 13.0:  <\/p>\n<ul>\n<li class=\"l\"> Prechod na pou\u017e\u00edvanie vetvy PostgreSQL 17.\n<li class=\"l\"> Mo\u017enos\u0165 pou\u017eitia v distribuovan\u00fdch po\u017eiadavk\u00e1ch funkcie JSON_TABLE() na transform\u00e1ciu \u00fadajov z form\u00e1tu JSON do rela\u010dn\u00e9ho zobrazenia, s ktor\u00fdm je mo\u017en\u00e9 pracova\u0165 ako s be\u017en\u00fdmi tabu\u013ekami PostgreSQL.\n<li class=\"l\"> Podpora syntaxe \u201eMERGE \u2026 WHEN NOT MATCHED BY SOURCE\u201c.\n<li class=\"l\">  Mo\u017enos\u0165 ur\u010di\u0165 met\u00f3du pr\u00edstupu pre distribuovan\u00e9 rozdelen\u00e9 tabu\u013eky pomocou v\u00fdrazu \u201eCREATE TABLE \u2026 USING\u201c, ako aj zmeni\u0165 met\u00f3du pr\u00edstupu prostredn\u00edctvom \u201eALTER TABLE \u2026 SET ACCESS METHOD\u201c.\n<li class=\"l\"> Pridan\u00e1 podpora pre ur\u010dovanie v distribuovan\u00fdch rozdelen\u00fdch tabu\u013ek\u00e1ch automaticky generovan\u00fdch st\u013apcov identifik\u00e1cie.\n<li class=\"l\"> Povolen\u00e9 pou\u017eitie obmedzen\u00ed-exkl\u00fazi\u00ed v distribuovan\u00fdch rozdelen\u00fdch tabu\u013ek\u00e1ch.\n<li class=\"l\"> Rie\u0161en\u00e9 probl\u00e9my so synchroniz\u00e1ciou rol\u00ed medzi uzlami.\n<li class=\"l\"> Zlep\u0161en\u00e9 rozde\u013eovanie \u00fadajov pre shardovanie pri prid\u00e1van\u00ed nov\u00fdch uzlov do klastre.\n<li class=\"l\"> Do pr\u00edkazu \u201eEXPLAIN\u201c boli pridan\u00e9 mo\u017enosti \u201eMEMORY\u201c a \u201eSERIALIZE\u201c, pomocou ktor\u00fdch je mo\u017en\u00e9 ur\u010di\u0165 ve\u013ekos\u0165 pou\u017eitej pam\u00e4te a \u010das str\u00e1ven\u00fd na pretransformovanie \u00fadajov na prenos po sieti.       <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62701\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Citus Data, \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0430\u0449\u0430\u044f Microsoft, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u0443\u044e \u0421\u0423\u0411\u0414 Citus 13.0, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u0443\u044e \u0432 \u0444\u043e\u0440\u043c\u0435 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f \u043a PostgreSQL 17. Citus \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0435 \u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 PostgreSQL \u0432 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0435 \u043d\u0430 \u0431\u0430\u0437\u0435 \u0442\u0438\u043f\u043e\u0432\u043e\u0433\u043e \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0440\u0430\u0437\u043d\u043e\u0441\u0438\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u043f\u043e \u0443\u0437\u043b\u0430\u043c \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0448\u0430\u0440\u0434\u0438\u043d\u0433\u0430 (sharding) \u0441 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u043e\u0439 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432 \u0438 \u0441\u0445\u0435\u043c\u044b \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f. \u0414\u043b\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043a\u043b\u0430\u0441\u0442\u0435\u0440 Citus \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u043a\u0430\u043a \u043e\u0434\u0438\u043d \u0431\u043e\u043b\u044c\u0448\u043e\u0439 [&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-121799","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Citus Data, 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