{"id":83153,"date":"2020-05-29T01:42:10","date_gmt":"2020-05-28T23:42:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0"},"modified":"2020-05-29T01:42:10","modified_gmt":"2020-05-28T23:42:10","slug":"vypusk-raspredelyonnoj-subd-tidb-4-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"Izlazak distribuirane DBMS TiDB 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/releases\/tag\/v4.0.0\">Dostupno<\/a><\/noindex> izdanje distribuirane DBMS <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/a><\/noindex>, razvijen pod utjecajem tehnologija Google <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>. TiDB pripada kategoriji hibridnih HTAP sustava (Hibridno Transakcijsko\/Analiti\u010dko Procesiranje) koji su sposobni kako za izvr\u0161avanje transakcija u stvarnom vremenu (OLTP), tako i za analiti\u010dka upitna obra\u010dunavanja. Projekt je napisan na jeziku Go i <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">distribuira se<\/a><\/noindex> pod licencom Apache 2.0.<\/p>\n<p>Zna\u010dajke TiDB-a:\n<\/p>\n<ul>\n<li class=\"l\"> Podr\u0161ka za SQL i pru\u017eanje korisni\u010dkog su\u010delja kompatibilnog s MySQL protokolom, \u0161to olak\u0161ava prilagodbu postoje\u0107ih aplikacija napisanim za MySQL za TiDB, kao i omogu\u0107uje kori\u0161tenje popularnih klijentskih biblioteka. Osim MySQL protokola, za pristup DBMS-u mo\u017ee se koristiti API temeljen na JSON-u i konektor za Spark.\n<\/li>\n<li class=\"l\"> Iz SQL mogu\u0107nosti podr\u017eavaju se indeksi, agregatne funkcije, izrazi GROUP BY, ORDER BY, DISTINCT, spojevi (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), prikazi, prozor funkcije i podupiti. Pru\u017eene mogu\u0107nosti su dovoljne za rad s TiDB u web-aplikacijama kao \u0161to su PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> i WordPress;\n<\/li>\n<li class=\"l\"> Mogu\u0107nost horizontalnog skaliranja i osiguranje otpornosti: kapacitet pohrane i ra\u010dunalnu snagu mogu\u0107e je pove\u0107ati jednostavnim dodavanjem novih \u010dvorova. Podaci se distribuiraju po \u010dvorovima s redundancijom koja omogu\u0107ava nastavak rada u slu\u010daju kvara pojedinih \u010dvorova. Kvarovi se automatski obra\u0111uju.\n<\/li>\n<li class=\"l\"> Sustav jam\u010di dosljednost i za klijentski softver izgleda kao jedna velika DBMS, iako se za izvr\u0161enje transakcija zapravo koriste podaci s vi\u0161e \u010dvorova.\n<\/li>\n<li class=\"l\"> Za fizi\u010dko pohranjivanje podataka na \u010dvorovima mogu se koristiti razli\u010diti backendovi, na primjer, lokalni sustavi za pohranu GoLevelDB i BoltDB ili vlastiti sustavi distribuirane pohrane <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex> i TiFlash. TiKV pohranjuje podatke u presjeku redaka u formatu klju\u010d\/vrijednost i optimalniji je za zadatke obrade transakcija (OLTP). TiFlash pohranjuje podatke vezane uz stupce i omogu\u0107ava postizanje ve\u0107e izvedbe pri rje\u0161avanju analiti\u010dkih zadataka (OLAP).\n<\/li>\n<li class=\"l\"> Mogu\u0107nost asinkrone promjene sheme pohrane, koja omogu\u0107ava dodavanje stupaca i indeksa u hodu bez prekida obrade trenutnih operacija.\n<\/li>\n<\/ul>\n<p>U novom izdanju:<\/p>\n<ul>\n<li class=\"l\"> Zadano je da se uklju\u010di distribuirani sakuplja\u010d sme\u0107a Green GC, koji zna\u010dajno pove\u0107ava brzinu sakupljanja sme\u0107a u velikim klasterima i pobolj\u0161ava stabilnost rada;\n<li class=\"l\">Dodana je podr\u0161ka za velike transakcije \u010dija je veli\u010dina prakti\u010dki ograni\u010dena fizi\u010dkom memorijom. Ograni\u010denje veli\u010dine jedne transakcije pove\u0107ano je sa 100 MB na 10 GB;\n<li class=\"l\"> Dodana je podr\u0161ka za komande BACKUP i RESTORE za pravljenje rezervnih kopija;\n<li class=\"l\"> Dodana je mogu\u0107nost postavljanja zaklju\u010davanja na tablice;\n<li class=\"l\"> Dodan je mehanizam izolacije transakcija kompatibilan s MySQL na razini \u010ditanja (READ COMMITTED);\n<li class=\"l\"> U komandu &#171;ADMIN SHOW DDL JOBS&#187; dodana je podr\u0161ka za izraze LIKE i WHERE;\n<li class=\"l\"> Dodana je opcija oom-use-tmp-storage koja omogu\u0107ava kori\u0161tenje privremenih datoteka za ke\u0161iranje me\u0111urezultata u uvjetima nedostatka radne memorije;\n<li class=\"l\"> Dodana je klju\u010dna rije\u010d Random za dodjeljivanje nasumi\u010dnih vrijednosti atributima;\n<li class=\"l\"> Tim LOAD DATA sada omogu\u0107ava kori\u0161tenje heksadecimalnih i binarnih izraza;\n<li class=\"l\"> Dodano je 15 parametara za upravljanje pona\u0161anjem optimizatora;\n<li class=\"l\"> Dodani su alati za dijagnosticiranje performansi SQL upita. Dodan je log sporih upita, dostupan kroz sistemske tablice SLOW_QUERY \/ CLUSTER_SLOW_QUERY;\n<li class=\"l\"> Dodana je podr\u0161ka za funkcije za rad s sekvencama;\n<li class=\"l\"> Dodana je mogu\u0107nost dinami\u010dke promjene parametara konfiguracije, koji se \u010ditaju iz PD (Placement Driver, poslu\u017eitelj za upravljanje klasterom). Tako\u0111er je dodana mogu\u0107nost kori\u0161tenja izraza &#171;SET CONFIG&#187; za promjenu postavki PD\/TiKV \u010dvorova.\n<li class=\"l\"> Dodana je postavka max-server-connections za ograni\u010davanje maksimalnog broja istovremenih konekcija na poslu\u017eitelj (zadano 4096);\n<li class=\"l\"> Pove\u0107ana je u\u010dinkovitost u situacijama kada se tra\u017eeni stupci potpuno pokrivaju indeksima;\n<li class=\"l\"> Dodana je optimizacija upita na osnovu spajanja indeksa;\n<li class=\"l\"> Pove\u0107ana je u\u010dinkovitost operacija nad opsegom vrijednosti;\n<li class=\"l\"> Smanjeno je optere\u0107enje CPU-a zahvaljuju\u0107i ke\u0161iranju rezultata pristupa indeksima i filtriranju duplikata;\n<li class=\"l\"> Dodana je podr\u0161ka za novi format pohrane redaka, koji omogu\u0107ava pove\u0107anje performansi tablica s velikim brojem stupaca;\n<li class=\"l\"> U funkciji GROUP_CONCAT dodana je podr\u0161ka za izraz &#171;ORDER BY&#187;;\n<li class=\"l\"> Dodana je mogu\u0107nost preuzimanja podataka iz loga TiFlash putem SQL-a;\n<li class=\"l\"> U naredbi &#171;RECOVER TABLE&#187; implementirana je podr\u0161ka za vra\u0107anje skra\u0107enih tablica;\n<li class=\"l\"> Dodana je sistemska tablica DDLJobs za upit detalja o izvr\u0161enju DDL zadataka;\n<li class=\"l\"> Dodana je mogu\u0107nost primjene naredbe SHOW CONFIG za prikazivanje postavki PD i TiKV;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">Uklju\u010deno<\/a><\/noindex>  zadano ke\u0161iranje ko-procesora;\n<li class=\"l\"> Broj ko-procedura (goroutine) u fazi ponovljenih poku\u0161aja potvrde sada se mo\u017ee kontrolirati putem postavke committer-concurrency;\n<li class=\"l\"> Dodana je mogu\u0107nost prikazivanja regija dijela tablica (table partition);\n<li class=\"l\"> U tidb-server dodana je mogu\u0107nost ograni\u010davanja veli\u010dine privremene pohrane;\n<li class=\"l\"> Dodana je podr\u0161ka za operacije &#171;insert into tbl_name partition(partition_name_list)&#187; i &#171;replace into tbl_name partition(partition_name_list)&#187;;\n<li class=\"l\"> U kori\u0161tenom he\u0161u za particioniranje dodana je podr\u0161ka za filtriranje po kriteriju &#171;is null&#187;;\n<li class=\"l\"> Za particionirane tablice dodana je podr\u0161ka za operacije provjere, \u010di\u0161\u0107enja i oporavka indeksa.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Izvor: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53045\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 TiDB 4.0, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u043e\u0434 \u0432\u043f\u0435\u0447\u0430\u0442\u043b\u0435\u043d\u0438\u0435\u043c \u043e\u0442 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439 Google Spanner \u0438 F1. TiDB \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u0438 \u0433\u0438\u0431\u0440\u0438\u0434\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c HTAP (Hybrid Transactional\/Analytical Processing), \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0445 \u043a\u0430\u043a \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0439 \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u043e\u043c \u0432\u0440\u0435\u043c\u0435\u043d\u0438 (OLTP), \u0442\u0430\u043a \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041f\u0440\u043e\u0435\u043a\u0442 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Apache 2.0. \u041e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 TiDB: \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 SQL [&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-83153","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=\"\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 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