{"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\/et\/blog\/news\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"V\u00e4lja on antud jaotatud andmebaasis\u00fcsteem 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\">Saadaval<\/a><\/noindex> jaotatud andmebaasi v\u00e4ljaanne <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/a><\/noindex>, mille arendamisel on saanud inspiratsiooni Google'i tehnoloogiatest <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>. TiDB kuulub h\u00fcbriids\u00fcsteemide HTAP (H\u00fcbriidne Tehingu\/Anal\u00fc\u00fctiline T\u00f6\u00f6tlemine) kategooriasse, mis suudavad nii tagada reaalaja tehingute t\u00e4itmist (OLTP) kui ka anal\u00fc\u00fctiliste p\u00e4ringute t\u00f6\u00f6tlemist. Projekt on kirjutatud Go keeles ja <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">levitatakse<\/a><\/noindex> lisensiga Apache 2.0.<\/p>\n<p>TiDB omadused:\n<\/p>\n<ul>\n<li class=\"l\"> SQL-i tugi ja kliendiliidese pakkumine, mis on \u00fchilduv MySQL protokolliga, mis lihtsustab TiDB-s olemasolevate MySQL-ile kirjutatud rakenduste kohandamist ning v\u00f5imaldab kasutada levinud klienditeeke. Lisaks MySQL protokollile saab andmebaasi juurde p\u00e4\u00e4seda ka JSON-p\u00f5hise API ja Spark konnektori abil.\n<\/li>\n<li class=\"l\"> SQL v\u00f5imalustest on toetatud indeksid, agregaadifunktsioonid, GROUP BY, ORDER BY, DISTINCT, liidud (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), vaated, aknafunktsioonid ja alamk\u00fcsitlused. Pakutavad v\u00f5imalused on piisavad TiDB kasutamiseks veebirakendustes nagu PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> ja WordPress;\n<\/li>\n<li class=\"l\"> Horisontaalse skaleeritavuse ja t\u00f5rkevaba t\u00f6\u00f6kindluse v\u00f5imalus: salvestusruumi ja arvutusv\u00f5imet saab suurendada lihtsalt uute s\u00f5lmede lisamisega. Andmed jaotatakse s\u00f5lmede vahel \u00fcleliigsuse p\u00f5him\u00f5ttel, mis v\u00f5imaldab s\u00fcsteemil j\u00e4tkata t\u00f6\u00f6d \u00fcksikute s\u00f5lmede rikke korral. Rikete k\u00e4sitlemine toimub automaatselt.\n<\/li>\n<li class=\"l\"> S\u00fcsteem garanteerib j\u00e4rjepidevuse ning klienditarkvara jaoks n\u00e4eb see v\u00e4lja nagu \u00fcks suur andmebaas, hoolimata sellest, et tehingu tegemiseks kaasatakse andmed paljusid s\u00f5lmi.\n<\/li>\n<li class=\"l\"> Andmete f\u00fc\u00fcsiliseks salvestamiseks s\u00f5lmedes v\u00f5ivad kasutada erinevaid backend'e, n\u00e4iteks kohalikud GoLevelDB ja BoltDB salvestusmootorid v\u00f5i oma jaotatud salvestuse mootoreid <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex> ja TiFlash. TiKV salvestab andmeid ridade l\u00f5ikes v\u00f5tme\/v\u00e4\u00e4rtuse formaadis ja on optimeeritum tehingut\u00f6\u00f6tluse (OLTP) \u00fclesannete jaoks. TiFlash salvestab andmeid veergude p\u00f5hjal ja v\u00f5imaldab saavutada suuremat j\u00f5udlust anal\u00fc\u00fctiliste \u00fclesannete (OLAP) lahendamisel.\n<\/li>\n<li class=\"l\"> Schema salvestamise as\u00fcnkroonse muutmise v\u00f5imalus, mis v\u00f5imaldab lisada veerge ja indekseid reaalajas ilma praeguste toimingute t\u00e4itmist peatamata.\n<\/li>\n<\/ul>\n<p>Uues v\u00e4ljaandes:<\/p>\n<ul>\n<li class=\"l\"> Vaikimisi on sisse l\u00fclitatud jaotatud pr\u00fcgikoristaja Green GC, mis oluliselt kiirendab pr\u00fcgikoristust suurtes klastrites ja suurendab t\u00f6\u00f6 stabiilsust;\n<li class=\"l\">Lisatud on suurte tehingute tugi, mille suurus on praktiliselt piiratud f\u00fc\u00fcsilise m\u00e4lu suurusega. \u00dche tehingu suuruse piirang on suurendatud 100 MB-lt 10 GB-le;\n<li class=\"l\"> Lisatud on BACKUP ja RESTORE k\u00e4skude tugi varundamiseks;\n<li class=\"l\"> Lisatud on v\u00f5imalus seada lukustus tabelitele;\n<li class=\"l\"> Lisatud on MySQL-i \u00fchilduv lugemise tasandi (READ COMMITTED) tehingute isoleerimise mehanism;\n<li class=\"l\"> admin SHOW DDL JOBS meeskonda lisati LIKE ja WHERE lahenduste tugi;\n<li class=\"l\"> Lisatud on parameeter oom-use-tmp-storage, mis v\u00f5imaldab kasutada ajutisi faile vahetoodete vahem\u00e4luks, kui m\u00e4lust on puudu;\n<li class=\"l\"> Lisatud on v\u00f5tmes\u00f5na Random, et m\u00e4\u00e4rata juhuslikud v\u00e4\u00e4rtused atribuutidele;\n<li class=\"l\"> LOAD DATA k\u00e4sus on n\u00fc\u00fcd v\u00f5imalik kasutada kuuekohalisi ja binaarseid v\u00e4ljendeid;\n<li class=\"l\"> Lisatud on 15 parameetrit optimeerija k\u00e4itumise juhtimiseks;\n<li class=\"l\"> SQL-p\u00e4ringute j\u00f5udluse diagnostikaks on lisatud vahendid. Lisatud on aeglaste p\u00e4ringute logi, mis on saadaval s\u00fcsteemitabelites SLOW_QUERY \/ CLUSTER_SLOW_QUERY;\n<li class=\"l\"> Lisatud on funktsioonide tugi j\u00e4rjestuste t\u00f6\u00f6tlemiseks;\n<li class=\"l\"> Lisatud on v\u00f5imalus d\u00fcnaamiliselt muuta konfiguratsiooniparameetreid, mis loetakse PD-st (Placement Driver, klastrijuhtimise server). Lisatud on v\u00f5imalus kasutada v\u00e4ljendit SET CONFIG s\u00f5lmede PD\/TiKV seadistuste muutmiseks.\n<li class=\"l\"> Lisatud on seade max-server-connections maksimaalse samal ajal avatud \u00fchenduste arvu piiramiseks serverile (vaikimisi 4096);\n<li class=\"l\"> J\u00f5udlust on suurendatud olukordades, kus taotletud veerud on t\u00e4ielikult kaetud indeksitega;\n<li class=\"l\"> Lisatud on indeksite \u00fchendamise alusel p\u00e4ringute optimeerimine;\n<li class=\"l\"> J\u00f5udlust on suurendatud v\u00e4\u00e4rtuste vahemike operatsioonide puhul;\n<li class=\"l\"> CPU koormust on v\u00e4hendatud indeksite tulemuslikkuse ja duplikaatide filtreerimise kaudu;\n<li class=\"l\"> Lisatud on uue rea salvestamise formaadi tugi, mis suurendab j\u00f5udlust tabelites, kus on palju veerge;\n<li class=\"l\"> GROUP_CONCAT funktsioonis on lisatud ORDER BY v\u00e4ljendi tugi;\n<li class=\"l\"> On lisatud v\u00f5imalus andmete v\u00e4ljav\u00f5tmiseks TiFlash logi kaudu SQL-i abil;\n<li class=\"l\"> RECOVER TABLE k\u00e4sk sisaldab n\u00fc\u00fcd toimetatud tabelite taastamise tuge;\n<li class=\"l\"> Lisatud s\u00fcsteemi tabel DDLJobs, et k\u00fcsida DDL-t\u00f6\u00f6de t\u00e4itmise \u00fcksikasju;\n<li class=\"l\"> Lisatud v\u00f5imalus rakendada k\u00e4sku SHOW CONFIG, et n\u00e4idata PD ja TiKV seadistusi;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">Vaikimisi on sisse l\u00fclitatud<\/a><\/noindex>  vaikimisi kopeerimise cache;\n<li class=\"l\"> S\u00fcsteemipartsionide (goroutine) arvu uuesti proovimise faasis saab n\u00fc\u00fcd kontrollida seadega committer-concurrency;\n<li class=\"l\"> Lisatud v\u00f5imalus kuvada tabeli osade piirkondi (table partition);\n<li class=\"l\"> Tidb-serverisse on lisatud v\u00f5imalus piiritleda ajutise salvestuse suurust;\n<li class=\"l\"> Lisatud on toetused operatsioonidele insert into tbl_name partition(partition_name_list) ja replace into tbl_name partition(partition_name_list);\n<li class=\"l\"> Sektsioneerimiseks (partitsioneerimiseks) kasutatud hashis on lisatud is null tunnuse alusel filtreerimise tugi;\n<li class=\"l\"> Sektsioonide tabelitele on lisatud toetus indeksite kontrollimise, puhastamise ja taastamise toimingutele.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <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 5.0.1.1 - 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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