{"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\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"Jaotatud andmebaasi s\u00fcsteemi TiDB 4.0 v\u00e4ljaanne","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> hajutatud andmebaasi v\u00e4ljaanne <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/a><\/noindex>, mis on arendatud Google'i tehnoloogiatest inspireerituna <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 (Hybrid Transactional\/Analytical Processing) kategooriasse, mis suudab toetada nii reaalajas tehingute (OLTP) t\u00e4itmist kui ka anal\u00fc\u00fctiliste p\u00e4ringute t\u00f6\u00f6tlemist. Projekt on kirjutatud keeles Go ja <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">GNU \u00dcldine Avaliku litsentsi alusel.<\/a><\/noindex> ainekood on litsentsitud Apache 2.0 all.<\/p>\n<p>TiDB omadused:\n<\/p>\n<ul>\n<li class=\"l\"> SQL-i toetamist ja MySQL-protokolliga \u00fchilduva kliendiliidese pakkumist, mis lihtsustab TiDB-le olemasolevate MySQL-i jaoks kirjutatud rakenduste kohandamist ning v\u00f5imaldab kasutada levinud klienditeeke. Lisaks MySQL-protokollile saab andmebaasi p\u00f6\u00f6rdumiseks kasutada JSON-p\u00f5hist API-t ja Spark'i \u00fchendust.\n<\/li>\n<li class=\"l\"> SQL-i v\u00f5imalustest toetatakse indekse, agregaatfunktsioone, GROUP BY, ORDER BY, DISTINCT v\u00e4ljendeid, liitumisi (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), vaateid, aknafunktsioone ja alam-p\u00e4ringuid. Pakutavad v\u00f5imalused on piisavad TiDB-ga t\u00f6\u00f6tamise korraldamiseks sellistes 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\u00f5rke taluvuse v\u00f5imalus: salvestusruumi ja arvutusv\u00f5imsust saab lihtsa uute s\u00f5lmede \u00fchendamisega suurendada. Andmed jaotatakse s\u00f5lmede vahel \u00fcleliigsusega, mis v\u00f5imaldab j\u00e4tkata t\u00f6\u00f6d \u00fcksikute s\u00f5lmede rikke korral. Rikete t\u00f6\u00f6tlemine toimub automaatselt.\n<\/li>\n<li class=\"l\"> S\u00fcsteem tagab j\u00e4rjepidevuse ja klientprogrammi jaoks n\u00e4ib see olevat \u00fcks suur andmebaas, hoolimata sellest, et tehingute t\u00e4itmiseks kasutatakse andmeid paljusid s\u00f5lmi.\n<\/li>\n<li class=\"l\"> F\u00fc\u00fcsiliste andmete salvestamiseks s\u00f5lmedes v\u00f5ivad kasutada erinevad tagused, n\u00e4iteks kohalikud salvestusmootorid GoLevelDB ja BoltDB v\u00f5i enda poolt loodud jaotatud salvestusmootorid <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 optimaalsem tehingut\u00f6\u00f6tluse (OLTP) \u00fclesannete jaoks. TiFlash salvestab andmeid veergude kaupa ning v\u00f5imaldab saavutada k\u00f5rgemat j\u00f5udlust anal\u00fc\u00fcsit\u00f6\u00f6de (OLAP) lahendamisel.\n<\/li>\n<li class=\"l\"> As\u00fcnkroonse salvestusstruktuuri muundamise v\u00f5imalus, mis v\u00f5imaldab jooksvalt lisada veerge ja indekseid, peatamata k\u00e4imasolevaid toimingute t\u00f6\u00f6tlemisi.\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 v\u00f5imaldab oluliselt suurendada pr\u00fcgikoristuse kiirus suurtel klastritel ja parandada t\u00f6\u00f6 stabiilsust;\n<li class=\"l\">Lisatud tugi suurtele tehingutele, mille suurust piirab praktiliselt f\u00fc\u00fcsilise m\u00e4lu maht. \u00dche tehingu suuruse piirangut on suurendatud 100 MB-lt 10 GB-le;\n<li class=\"l\"> Lisatud tugi BACKUP ja RESTORE k\u00e4skudele varukoopiate tegemiseks;\n<li class=\"l\"> Lisatud v\u00f5imalus seada lukustusi tabelitele;\n<li class=\"l\"> Lisatud MySQL \u00fchilduv tehingute isoleerimise mehhanism lugemise tasemel (READ COMMITTED);\n<li class=\"l\"> Meeskonda &#171;ADMIN SHOW DDL JOBS&#187; on lisatud toetus LIKE ja WHERE v\u00e4ljenditele;\n<li class=\"l\"> Lisatud parameeter oom-use-tmp-storage, mis v\u00f5imaldab kasutada ajutisi faile vahepealsete tulemuste vahem\u00e4llu salvestamiseks, kui m\u00e4lumaht on madal;\n<li class=\"l\"> Lisatud m\u00e4rks\u00f5na Random, et anda atribuute juhuslike v\u00e4\u00e4rtuste m\u00e4\u00e4ramiseks;\n<li class=\"l\"> LOAD DATA k\u00e4sklustes on n\u00fc\u00fcd v\u00f5imalik kasutada kuueteistk\u00fcmnendikke ja binaarseid v\u00e4ljendeid;\n<li class=\"l\"> Lisatud 15 parameetrit optimeerija k\u00e4itumise haldamiseks;\n<li class=\"l\"> Lisatud SQL-p\u00e4ringute j\u00f5udluse diagnoosimise vahendid. Lisatud aeglaste p\u00e4ringute logi, mis on saadaval s\u00fcsteemitabelite SLOW_QUERY \/ CLUSTER_SLOW_QUERY kaudu;\n<li class=\"l\"> Lisatud funktsioonide tugi j\u00e4rjestuste haldamiseks;\n<li class=\"l\"> Lisatud on v\u00f5imalus d\u00fcnaamiliselt muuta konfigureerimise parameetreid, mida loetakse PD-st (Placement Driver, klastrihalduse server). Lisatud on ka v\u00e4ljendi &#171;SET CONFIG&#187; kasutamise v\u00f5imalus PD\/TiKV s\u00f5lmede seadete muutmiseks.\n<li class=\"l\"> Lisatud seade max-server-connections maksimaalse samaaegsete \u00fchenduste arvu piiramiseks serverisse (vaikimisi 4096);\n<li class=\"l\"> Suurenenud j\u00f5udlus olukordades, kus taotletavad veerud on t\u00e4ielikult kaetud indeksitega;\n<li class=\"l\"> Lisatud p\u00e4ringute optimeerimine indeksi \u00fchinemise p\u00f5hjal;\n<li class=\"l\"> T\u00f5hustatud v\u00e4\u00e4rtuste vahemike operatsioonide j\u00f5udlust;\n<li class=\"l\"> CPU koormust v\u00e4hendatud indekseedega seotud p\u00e4ringute tulemuste vahem\u00e4lu ja duplikaatide filtreerimise abil;\n<li class=\"l\"> Lisatud uus stringi salvestamise formaadi tugi, mis v\u00f5imaldab suurendada tabelite j\u00f5udlust, kus on palju veerge;\n<li class=\"l\"> Funktsioonis GROUP_CONCAT on n\u00fc\u00fcd toetus &#171;ORDER BY&#187; v\u00e4ljendile;\n<li class=\"l\"> Lisatud v\u00f5imalus hankida andmeid TiFlashi logidest SQL-i kaudu;\n<li class=\"l\"> K\u00e4sus &#171;RECOVER TABLE&#187; on rakendatud toetust l\u00f5igatud tabelite taastamiseks;\n<li class=\"l\"> Lisatud s\u00fcsteemitabel DDLJobs DDL t\u00f6\u00f6de t\u00e4itmise detailide p\u00e4rimiseks;\n<li class=\"l\"> Lisatud k\u00e4sk SHOW CONFIG PD ja TiKV seadete kuvamiseks;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">L\u00fclitatud<\/a><\/noindex>  vaikimisi kooperatiivse protsessori vahem\u00e4lu;\n<li class=\"l\"> S\u00fcsmust\u00f6\u00f6d (goroutine) uuesti p\u00fchendumise faasis saab n\u00fc\u00fcd juhtida seadistusega committer-concurrency;\n<li class=\"l\"> Lisatud v\u00f5imalus kuvada tabeli jaotiste piirkondi (table partition);\n<li class=\"l\"> Tidb-serveris on lisatud v\u00f5imalus piirata ajutise m\u00e4lu suurust;\n<li class=\"l\"> Lisatud on toetus operatsioonidele &#171;insert into tbl_name partition(partition_name_list)&#187; ja &#171;replace into tbl_name partition(partition_name_list)&#187;;\n<li class=\"l\"> Sektsioonimiseks (partitsioneerimiseks) kasutatavas hashes on n\u00fc\u00fcd toetus filtrile &#171;is null&#187;;\n<li class=\"l\"> Sektsioneeritud tabelite jaoks on lisatud tugi indeksite kontrolleerimiseks, puhastamiseks ja taastamiseks.\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. 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