{"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\/cs\/blog\/news\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"Vyd\u00e1n\u00ed distribuovan\u00e9 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\">Dostupn\u00e9<\/a><\/noindex> uvoln\u011bn\u00ed distribuovan\u00e9 DBMS <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/a><\/noindex>, vyvinut\u00e9 pod dojmem technologi\u00ed Google <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>. TiDB pat\u0159\u00ed do kategorie hybridn\u00edch syst\u00e9m\u016f HTAP (Hybrid Transactional\/Analytical Processing), schopn\u00fdch jak poskytovat prov\u00e1d\u011bn\u00ed transakc\u00ed v re\u00e1ln\u00e9m \u010dase (OLTP), tak vykon\u00e1vat zpracov\u00e1n\u00ed analytick\u00fdch dotaz\u016f. Projekt je naps\u00e1n v jazyce Go a <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">distribuov\u00e1no<\/a><\/noindex> pod licenc\u00ed Apache 2.0.<\/p>\n<p>Vlastnosti TiDB:\n<\/p>\n<ul>\n<li class=\"l\"> Podpora SQL a poskytov\u00e1n\u00ed klientsk\u00e9ho rozhran\u00ed kompatibiln\u00edho s protokolem MySQL, co\u017e zjednodu\u0161uje adaptaci st\u00e1vaj\u00edc\u00edch aplikac\u00ed, napsan\u00fdch pro MySQL, na TiDB a tak\u00e9 umo\u017e\u0148uje vyu\u017e\u00edvat b\u011b\u017en\u00e9 klientsk\u00e9 knihovny. Krom\u011b protokolu MySQL lze pro p\u0159\u00edstup k DBMS pou\u017e\u00edt API zalo\u017een\u00e9 na JSON a konektor pro Spark.\n<\/li>\n<li class=\"l\"> Mezi mo\u017enosti SQL pat\u0159\u00ed podpora index\u016f, agrega\u010dn\u00ed funkce, v\u00fdrazy GROUP BY, ORDER BY, DISTINCT, spojen\u00ed (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), pohledy, okna funkc\u00ed a subdotazy. Poskytovan\u00e9 mo\u017enosti jsou dostate\u010dn\u00e9 k tomu, aby mohly podporovat provoz s TiDB webov\u00fdch aplikac\u00ed, jako jsou PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> a WordPress;\n<\/li>\n<li class=\"l\"> Mo\u017enost horizont\u00e1ln\u00edho \u0161k\u00e1lov\u00e1n\u00ed a zaji\u0161t\u011bn\u00ed odolnosti proti v\u00fdpadk\u016fm: velikost \u00falo\u017ei\u0161t\u011b a v\u00fdpo\u010detn\u00ed v\u00fdkon lze zvy\u0161ovat jednoduch\u00fdm p\u0159ipojen\u00edm nov\u00fdch uzl\u016f. Data jsou distribuov\u00e1na mezi uzly s redundanc\u00ed, kter\u00e1 umo\u017e\u0148uje pokra\u010dovat v pr\u00e1ci v p\u0159\u00edpad\u011b selh\u00e1n\u00ed jednotliv\u00fdch uzl\u016f. Selh\u00e1n\u00ed jsou zpracov\u00e1v\u00e1na automaticky.\n<\/li>\n<li class=\"l\"> Syst\u00e9m zaru\u010duje konzistenci a pro klientsk\u00fd software vypad\u00e1 jako jedna velk\u00e1 DBMS, a\u010dkoli pro prov\u00e1d\u011bn\u00ed transakce jsou zapojeny data z mnoha uzl\u016f.\n<\/li>\n<li class=\"l\"> Pro fyzick\u00e9 ukl\u00e1d\u00e1n\u00ed dat na uzlech lze pou\u017e\u00edvat r\u016fzn\u00e9 backendy, nap\u0159\u00edklad lok\u00e1ln\u00ed \u00falo\u017en\u00e9 motory GoLevelDB a BoltDB nebo vlastn\u00ed motory distribuovan\u00e9ho \u00falo\u017ei\u0161t\u011b <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex> a TiFlash. TiKV ukl\u00e1d\u00e1 data v \u0159ezan\u00e9m form\u00e1tu kl\u00ed\u010d\/hodnota a je optimalizov\u00e1n pro \u00fakoly zpracov\u00e1n\u00ed transakc\u00ed (OLTP). TiFlash ukl\u00e1d\u00e1 data ve sloupc\u00edch a umo\u017e\u0148uje dos\u00e1hnout vy\u0161\u0161\u00ed v\u00fdkonnosti p\u0159i \u0159e\u0161en\u00ed analytick\u00fdch \u00faloh (OLAP).\n<\/li>\n<li class=\"l\"> Mo\u017enost asynchronn\u00edch zm\u011bn sch\u00e9matu ukl\u00e1d\u00e1n\u00ed, kter\u00e1 umo\u017e\u0148uje na m\u00edst\u011b p\u0159id\u00e1vat sloupce a indexy bez zastaven\u00ed zpracov\u00e1n\u00ed aktu\u00e1ln\u00edch operac\u00ed.\n<\/li>\n<\/ul>\n<p>V nov\u00e9m vyd\u00e1n\u00ed:<\/p>\n<ul>\n<li class=\"l\"> Ve v\u00fdchoz\u00edm nastaven\u00ed je aktivov\u00e1n distribuovan\u00fd garbage collector Green GC, kter\u00fd v\u00fdrazn\u011b zvy\u0161uje rychlost sb\u011bru odpadu ve velk\u00fdch clusterech a zvy\u0161uje stabilitu provozu;\n<li class=\"l\">Byla p\u0159id\u00e1na podpora pro velk\u00e9 transakce, jejich\u017e velikost je prakticky omezena velikost\u00ed fyzick\u00e9 pam\u011bti. Omezen\u00ed velikosti jedn\u00e9 transakce bylo zv\u00fd\u0161eno ze 100 MB na 10 GB;\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora p\u0159\u00edkaz\u016f BACKUP a RESTORE pro z\u00e1lohov\u00e1n\u00ed;\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost zam\u010den\u00ed tabulek;\n<li class=\"l\"> Byl p\u0159id\u00e1n mechanismus izolace transakc\u00ed kompatibiln\u00ed s MySQL na \u00farovni \u010dten\u00ed (READ COMMITTED);\n<li class=\"l\"> Do p\u0159\u00edkazu &#171;ADMIN SHOW DDL JOBS&#187; byla p\u0159id\u00e1na podpora v\u00fdraz\u016f LIKE a WHERE;\n<li class=\"l\"> Byl p\u0159id\u00e1n parametr oom-use-tmp-storage, kter\u00fd umo\u017e\u0148uje pou\u017e\u00edvat do\u010dasn\u00e9 soubory pro ukl\u00e1d\u00e1n\u00ed meziprodukt\u016f v podm\u00ednk\u00e1ch nedostatku opera\u010dn\u00ed pam\u011bti;\n<li class=\"l\"> Bylo p\u0159id\u00e1no kl\u00ed\u010dov\u00e9 slovo Random pro p\u0159i\u0159azen\u00ed n\u00e1hodn\u00fdch hodnot atribut\u016fm;\n<li class=\"l\"> V p\u0159\u00edkazu LOAD DATA se objevila mo\u017enost pou\u017eit\u00ed hexadecim\u00e1ln\u00edch a bin\u00e1rn\u00edch v\u00fdraz\u016f;\n<li class=\"l\"> Bylo p\u0159id\u00e1no 15 parametr\u016f pro \u0159\u00edzen\u00ed chov\u00e1n\u00ed optimaliz\u00e1toru;\n<li class=\"l\"> Byly p\u0159id\u00e1ny n\u00e1stroje pro diagnostiku v\u00fdkonu SQL dotaz\u016f. Byl p\u0159id\u00e1n log pomal\u00fdch dotaz\u016f, dostupn\u00fd prost\u0159ednictv\u00edm syst\u00e9mov\u00fdch tabulek SLOW_QUERY \/ CLUSTER_SLOW_QUERY;\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora funkc\u00ed pro pr\u00e1ci se sekvencemi;\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost dynamicky m\u011bnit parametry konfigurace, \u010dten\u00e9 z PD (Placement Driver, server pro spr\u00e1vu clustera). Byla p\u0159id\u00e1na mo\u017enost pou\u017e\u00edvat v\u00fdraz &#171;SET CONFIG&#187; k \u00faprav\u011b nastaven\u00ed uzl\u016f PD\/TiKV.\n<li class=\"l\"> Bylo p\u0159id\u00e1no nastaven\u00ed max-server-connections pro omezen\u00ed maxim\u00e1ln\u00edho po\u010dtu sou\u010dasn\u00fdch p\u0159ipojen\u00ed k serveru (v\u00fdchoz\u00ed 4096);\n<li class=\"l\"> Byla zv\u00fd\u0161ena v\u00fdkonnost v situac\u00edch, kdy jsou po\u017eadovan\u00e9 sloupce zcela pokryty indexy;\n<li class=\"l\"> Byla p\u0159id\u00e1na optimalizace dotaz\u016f na z\u00e1klad\u011b slou\u010den\u00ed index\u016f;\n<li class=\"l\"> Byla zv\u00fd\u0161ena v\u00fdkonnost operac\u00ed s rozsahy hodnot;\n<li class=\"l\"> Bylo sn\u00ed\u017eeno zat\u00ed\u017een\u00ed CPU d\u00edky ukl\u00e1d\u00e1n\u00ed v\u00fdsledk\u016f p\u0159\u00edstupu k index\u016fm do mezipam\u011bti a odfiltrov\u00e1n\u00ed duplicit;\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora nov\u00e9ho form\u00e1tu ukl\u00e1d\u00e1n\u00ed \u0159et\u011bzc\u016f, kter\u00fd zvy\u0161uje v\u00fdkonnost tabulek s velk\u00fdm po\u010dtem sloupc\u016f;\n<li class=\"l\"> Ve funkci GROUP_CONCAT se objevila podpora v\u00fdrazu &#171;ORDER BY&#187;;\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost vyhled\u00e1v\u00e1n\u00ed dat z logu TiFlash pomoc\u00ed SQL;\n<li class=\"l\"> V p\u0159\u00edkazu &#171;RECOVER TABLE&#187; byla implementov\u00e1na podpora obnoven\u00ed zkr\u00e1cen\u00fdch tabulek;\n<li class=\"l\"> Byla p\u0159id\u00e1na syst\u00e9mov\u00e1 tabulka DDLJobs pro dotazov\u00e1n\u00ed podrobnost\u00ed o prov\u00e1d\u011bn\u00ed DDL prac\u00ed;\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost aplikace p\u0159\u00edkazu SHOW CONFIG pro zobrazen\u00ed nastaven\u00ed PD a TiKV;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">Zahrnuto<\/a><\/noindex>  v\u00fdchoz\u00ed cache koprocesoru;\n<li class=\"l\"> Po\u010det spoluprogram\u016f (goroutine) ve f\u00e1zi opakovan\u00fdch pokus\u016f o commit lze nyn\u00ed \u0159\u00eddit pomoc\u00ed nastaven\u00ed committer-concurrency;\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost zobrazen\u00ed region\u016f tabulkov\u00e9ho odd\u00edlu (table partition);\n<li class=\"l\"> Do tidb-server byla p\u0159id\u00e1na mo\u017enost omezen\u00ed velikosti do\u010dasn\u00e9ho \u00falo\u017ei\u0161t\u011b;\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora operac\u00ed &#171;insert into tbl_name partition(partition_name_list)&#187; a &#171;replace into tbl_name partition(partition_name_list)&#187;;\n<li class=\"l\"> Ve vyu\u017e\u00edvan\u00e9m hashi pro sekcionov\u00e1n\u00ed (particionov\u00e1n\u00ed) byla p\u0159id\u00e1na podpora filtrov\u00e1n\u00ed podle znaku &#171;is null&#187;;\n<li class=\"l\"> Pro sekcionovan\u00e9 tabulky byla p\u0159id\u00e1na podpora operac\u00ed kontroly, \u010di\u0161t\u011bn\u00ed a obnovy index\u016f.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <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 5.0.3 - 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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