{"id":36120,"date":"2019-10-31T22:09:43","date_gmt":"2019-10-31T19:09:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vypusk-raspredelyonnoj-subd-tidb-3-0\/"},"modified":"2019-10-31T22:09:43","modified_gmt":"2019-10-31T19:09:43","slug":"vypusk-raspredelyonnoj-subd-tidb-3-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-raspredelyonnoj-subd-tidb-3-0","title":{"rendered":"A TiDB 3.0 elosztott adatb\u00e1zis-kezel\u0151 kiad\u00e1sa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/blog\/tidb-3.0-announcement\/\">El\u00e9rhet\u0151<\/a><\/noindex> az elosztott adatb\u00e1zis-kezel\u0151 rendszer kiad\u00e1sa <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 3.0<\/a><\/noindex>, amelyet a Google <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> \u00e9s <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>technol\u00f3gi\u00e1i inspir\u00e1ltak. A TiDB hibrid HTAP (Hybrid Transactional\/Analytical Processing) rendszerek k\u00f6z\u00e9 tartozik, amelyek k\u00e9pesek val\u00f3s idej\u0171 tranzakci\u00f3k (OLTP) v\u00e9grehajt\u00e1s\u00e1ra, valamint analitikai lek\u00e9rdez\u00e9sek feldolgoz\u00e1s\u00e1ra. A projekt Go nyelven k\u00e9sz\u00fclt, \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">terjeszt\u00e9sre ker\u00fcl<\/a><\/noindex> Apache 2.0 licenc alatt.<\/p>\n<p>A TiDB jellemz\u0151i:\n<\/p>\n<ul>\n<li class=\"l\"> SQL t\u00e1mogat\u00e1s \u00e9s MySQL protokoll kompatibilis kliens interf\u00e9sz biztos\u00edt\u00e1sa, ami megk\u00f6nny\u00edti a megl\u00e9v\u0151 MySQL alkalmaz\u00e1sok TiDB-re val\u00f3 \u00e1t\u00e1ll\u00edt\u00e1s\u00e1t, valamint lehet\u0151v\u00e9 teszi a n\u00e9pszer\u0171 kliens k\u00f6nyvt\u00e1rak haszn\u00e1lat\u00e1t. A MySQL protokoll mellett JSON alap\u00fa API \u00e9s Spark csatlakoz\u00f3 is haszn\u00e1lhat\u00f3 az adatb\u00e1zishoz val\u00f3 hozz\u00e1f\u00e9r\u00e9shez.\n<\/li>\n<li class=\"l\"> SQL lehet\u0151s\u00e9gek k\u00f6z\u00e9 tartozik az indexek, aggreg\u00e1l\u00f3 f\u00fcggv\u00e9nyek, GROUP BY, ORDER BY, DISTINCT, egyes\u00edt\u00e9sek (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), n\u00e9zetek, ablakos f\u00fcggv\u00e9nyek \u00e9s be\u00e1gyazott lek\u00e9rdez\u00e9sek t\u00e1mogat\u00e1sa. Az el\u00e9rhet\u0151 funkci\u00f3k elegend\u0151ek olyan webalkalmaz\u00e1sok, mint a PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> \u00e9s WordPress megfelel\u0151 m\u0171k\u00f6d\u00e9s\u00e9hez;\n<\/li>\n<li class=\"l\"> A v\u00edzszintes sk\u00e1l\u00e1z\u00e1s \u00e9s a hibamentess\u00e9g lehet\u0151s\u00e9ge: a t\u00e1rol\u00e1si kapacit\u00e1s \u00e9s a sz\u00e1m\u00edt\u00e1si teljes\u00edtm\u00e9ny \u00faj csom\u00f3pontok egyszer\u0171 csatlakoztat\u00e1s\u00e1val n\u00f6velhet\u0151. Az adatok redundanci\u00e1val oszlanak el a csom\u00f3pontok k\u00f6z\u00f6tt, lehet\u0151v\u00e9 t\u00e9ve a m\u0171k\u00f6d\u00e9s folytat\u00e1s\u00e1t az egyes csom\u00f3pontok meghib\u00e1sod\u00e1sa eset\u00e9n. A meghib\u00e1sod\u00e1sok automatikusan kezelhet\u0151k.\n<\/li>\n<li class=\"l\"> A rendszer garant\u00e1lja a konzisztenci\u00e1t, \u00e9s az \u00fcgyf\u00e9lszoftver sz\u00e1m\u00e1ra \u00fagy t\u0171nik, mint egy nagy adatb\u00e1zis, annak ellen\u00e9re, hogy val\u00f3j\u00e1ban a tranzakci\u00f3k v\u00e9grehajt\u00e1s\u00e1hoz t\u00f6bb csom\u00f3pont adatait vonj\u00e1k be.\n<\/li>\n<li class=\"l\"> A fizikailag t\u00e1rolt adatokhoz k\u00fcl\u00f6nb\u00f6z\u0151 h\u00e1tt\u00e9rt\u00e1rak haszn\u00e1lhat\u00f3k a csom\u00f3pontokban, p\u00e9ld\u00e1ul a GoLevelDB \u00e9s a BoltDB helyi t\u00e1rol\u00f3motorok, vagy saj\u00e1t elosztott t\u00e1rol\u00e1si motorunk. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex>.\n<\/li>\n<li class=\"l\"> Az adatt\u00e1rol\u00e1si s\u00e9ma aszinkron m\u00f3dos\u00edt\u00e1s\u00e1nak lehet\u0151s\u00e9ge, amely lehet\u0151v\u00e9 teszi oszlopok \u00e9s indexek \u00e9l\u0151 hozz\u00e1ad\u00e1s\u00e1t a jelenlegi m\u0171veletek le\u00e1ll\u00edt\u00e1sa n\u00e9lk\u00fcl.\n<\/ul>\n<p>F\u0151 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/releases\/tag\/v3.0.0\">\u00fajdons\u00e1gok<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> Teljes\u00edtm\u00e9nyfokoz\u00f3 munk\u00e1latok zajlottak. A Sysbench 3.0-as verzi\u00f3ja 1,5-sz\u00f6r gyorsabb a 2.1-es \u00e1ghoz k\u00e9pest a select \u00e9s update m\u0171veletek v\u00e9grehajt\u00e1sa sor\u00e1n, m\u00edg a TPC-C tesztben 4,5-sz\u00f6r\u00f6s teljes\u00edtm\u00e9nyt mutat. Az optimaliz\u00e1l\u00e1sok k\u00fcl\u00f6nb\u00f6z\u0151 lek\u00e9rdez\u00e9seket \u00e9rintettek, bele\u00e9rtve az 'IN', 'DO' \u00e9s 'NOT EXISTS' al-lek\u00e9rdez\u00e9seket, a t\u00e1bl\u00e1k egyes\u00edt\u00e9s\u00e9vel (JOIN) kapcsolatos m\u0171veleteket, indexek haszn\u00e1lat\u00e1t \u00e9s m\u00e9g sok m\u00e1st;<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/images\/blog\/oltp-point-select-in-sysbench-and-tidb-2.1.png\"><img decoding=\"async\" alt=\"A TiDB 3.0 elosztott adatb\u00e1zis-kezel\u0151 kiad\u00e1sa \" src=\"\/wp-content\/uploads\/2019\/07\/f4c63d50663f95fb877fa111810439f3.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/images\/blog\/tpc-c-results-for-tidb-3.0-and-tidb-2.1.png\"><img decoding=\"async\" alt=\"A TiDB 3.0 elosztott adatb\u00e1zis-kezel\u0151 kiad\u00e1sa \" src=\"\/wp-content\/uploads\/2019\/07\/89768360adce73a07b9248cf286053bd.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<li class=\"l\"> \u00daj t\u00e1rol\u00f3motor ker\u00fclt bevezet\u00e9sre, a TiFlash, amely a magasabb teljes\u00edtm\u00e9nyt c\u00e9lozza meg analitikai feladatok (OLAP) megold\u00e1s\u00e1hoz az oszlophoz k\u00f6t\u00f6tt t\u00e1rol\u00e1s r\u00e9v\u00e9n. A TiFlash kieg\u00e9sz\u00edti az el\u0151z\u0151leg k\u00edn\u00e1lt TiKV t\u00e1rol\u00f3t, amely kulcs\/\u00e9rt\u00e9k form\u00e1tumban sorokban t\u00e1rolja az adatokat, \u00e9s optim\u00e1lisabb a tranzakci\u00f3s feldolgoz\u00e1si feladatokhoz (OLTP). A TiFlash a TiKV mellett m\u0171k\u00f6dik, \u00e9s az adatok a kor\u00e1bbiak szerint tov\u00e1bbra is replik\u00e1l\u00f3dnak a TiKV-ben a konszenzus kialak\u00edt\u00e1s\u00e1hoz haszn\u00e1lt Raft protokoll seg\u00edts\u00e9g\u00e9vel, de minden Raft replikacsoporthoz egy tov\u00e1bbi replik\u00e1t hoznak l\u00e9tre, amelyet a TiFlash-ban haszn\u00e1lnak. Ez a megk\u00f6zel\u00edt\u00e9s lehet\u0151v\u00e9 teszi az er\u0151forr\u00e1sok jobb eloszt\u00e1s\u00e1t az OLTP \u00e9s OLAP feladatok k\u00f6z\u00f6tt, valamint az azonnali hozz\u00e1f\u00e9r\u00e9st biztos\u00edt a tranzakci\u00f3s adatokhoz analitikai lek\u00e9rdez\u00e9sekhez.\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/images\/blog\/tidb-htap-architecture-1.png\"><img decoding=\"async\" alt=\"A TiDB 3.0 elosztott adatb\u00e1zis-kezel\u0151 kiad\u00e1sa \" src=\"\/wp-content\/uploads\/2019\/07\/ba4a4e5e9c9390c7db6fcdb4e88e7e40.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<li class=\"l\"> Kialak\u00edtott\u00e1k a p\u00e1rhuzamos szem\u00e9tgy\u0171jt\u0151 rendszert, amely jelent\u0151sen megn\u00f6veli a szem\u00e9tgy\u0171jt\u00e9s sebess\u00e9g\u00e9t nagy klaszterekben \u00e9s n\u00f6veli a stabilit\u00e1st.\n<li class=\"l\"> K\u00eds\u00e9rleti jelleggel bevezet\u00e9sre ker\u00fclt a szerepk\u00f6r alap\u00fa hozz\u00e1f\u00e9r\u00e9s-vez\u00e9rl\u0151 rendszer (RBAC). A hozz\u00e1f\u00e9r\u00e9si jogok megad\u00e1s\u00e1nak lehet\u0151s\u00e9ge is biztos\u00edtva van az ANALYZE, USE, SET GLOBAL \u00e9s SHOW PROCESSLIST m\u0171veletekhez.\n<li class=\"l\"> Lehet\u0151s\u00e9g ny\u00edlik SQL kifejez\u00e9sek haszn\u00e1lat\u00e1ra a lass\u00fa lek\u00e9rdez\u00e9sek napl\u00f3j\u00e1b\u00f3l val\u00f3 kiv\u00e1laszt\u00e1shoz.\n<li class=\"l\"> Kialak\u00edtotta a t\u00f6r\u00f6lt t\u00e1bl\u00e1k gyors helyre\u00e1ll\u00edt\u00e1s\u00e1nak mechanizmus\u00e1t, amely lehet\u0151v\u00e9 teszi a v\u00e9letlen\u00fcl t\u00f6r\u00f6lt adatok helyre\u00e1ll\u00edt\u00e1s\u00e1t.\n<li class=\"l\"> Egys\u00e9ges\u00edtve lett a napl\u00f3zott esem\u00e9nyek form\u00e1tuma.\n<li class=\"l\"> Bevezet\u00e9sre ker\u00fclt a pesszimista z\u00e1rol\u00e1si m\u00f3d t\u00e1mogat\u00e1sa, amely a tranzakci\u00f3k kezel\u00e9s\u00e9t a MySQL-hez k\u00f6zelebb hozza.\n<li class=\"l\"> Hozz\u00e1adva az ablakos funkci\u00f3k (window-funkci\u00f3k vagy analitikai funkci\u00f3k) t\u00e1mogat\u00e1sa, amelyek kompatibilisek a MySQL 8.0-val. Az ablakos funkci\u00f3k lehet\u0151v\u00e9 teszik, hogy minden lek\u00e9rdez\u00e9si sor sz\u00e1m\u00e1ra sz\u00e1m\u00edt\u00e1sokat v\u00e9gezzenek m\u00e1s sorok felhaszn\u00e1l\u00e1s\u00e1val. Ellent\u00e9tben az aggreg\u00e1l\u00f3 funkci\u00f3kkal, amelyek a csoportos\u00edtott sorhalmazt egyetlen sorra \u00f6sszegzik, az ablakos funkci\u00f3k aggreg\u00e1l\u00e1st v\u00e9geznek az 'ablak' tartalma alapj\u00e1n, amely egy vagy t\u00f6bb sort tartalmaz a lek\u00e9rdez\u00e9si eredm\u00e9nyhalmazb\u00f3l. Az implement\u00e1lt ablakos funkci\u00f3k k\u00f6z\u00f6tt szerepelnek:<br \/>\nNTILE, LEAD, LAG, PERCENT_RANK, NTH_VALUE, CUME_DIST, FIRST_VALUE, LAST_VALUE, RANK, DENSE_RANK \u00e9s ROW_NUMBER;<\/p>\n<li class=\"l\"> Hozz\u00e1adva az experiment\u00e1lis n\u00e9zetek (VIEW) t\u00e1mogat\u00e1sa;\n<li class=\"l\"> Jav\u00edtva a particion\u00e1l\u00e1si rendszer, lehet\u0151s\u00e9g l\u00e9trehozva az adatok szekvenci\u00f3khoz val\u00f3 eloszt\u00e1s\u00e1ra \u00e9rt\u00e9ktartom\u00e1ny vagy hash-alapj\u00e1n;\n<li class=\"l\"> Hozz\u00e1adva a plugin fejleszt\u00e9si keretrendszer, p\u00e9ld\u00e1ul m\u00e1r elk\u00e9sz\u00fclt pluginek az IP feh\u00e9rlist\u00e1hoz vagy az audit napl\u00f3z\u00e1s\u00e1hoz;\n<li class=\"l\"> K\u00eds\u00e9rleti t\u00e1mogat\u00e1s biztos\u00edtva az 'EXPLAIN ANALYZE' funkci\u00f3 sz\u00e1m\u00e1ra az SQL-lek\u00e9rdez\u00e9s v\u00e9grehajt\u00e1si terv\u00e9nek (SQL Plan Management) fel\u00e9p\u00edt\u00e9s\u00e9hez;\n<li class=\"l\">  Hozz\u00e1adva a next_row_id parancs a k\u00f6vetkez\u0151 sor azonos\u00edt\u00f3j\u00e1nak megszerz\u00e9s\u00e9hez;\n<li class=\"l\"> \u00daj be\u00e9p\u00edtett funkci\u00f3k hozz\u00e1adva: JSON_QUOTE, JSON_ARRAY_APPEND, JSON_MERGE_PRESERVE, BENCHMARK, COALESCE \u00e9s NAME_CONST.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51060\">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 3.0, \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":27011,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-36120","post","type-post","status-publish","format-standard","has-post-thumbnail","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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