{"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\/it\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-3-0","title":{"rendered":"Rilascio del database distribuito TiDB 3.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/blog\/tidb-3.0-announcement\/\">Disponibile<\/a><\/noindex> rilascio di un database distribuito <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 3.0<\/a><\/noindex>, sviluppato ispirandosi alle tecnologie di Google <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>. TiDB appartiene alla categoria dei sistemi ibridi HTAP (Hybrid Transactional\/Analytical Processing), in grado di gestire sia transazioni in tempo reale (OLTP) che l'elaborazione di query analitiche. Il progetto \u00e8 scritto in Go e <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">distribuito<\/a><\/noindex> sotto licenza Apache 2.0.<\/p>\n<p>Caratteristiche di TiDB:\n<\/p>\n<ul>\n<li class=\"l\"> Supporto per SQL e fornitura di un'interfaccia client compatibile con il protocollo MySQL, che facilita l'adattamento per le applicazioni esistenti scritte per MySQL e consente di utilizzare librerie client comuni. Oltre al protocollo MySQL, \u00e8 possibile utilizzare un'API basata su JSON e un connettore per Spark per accedere al database.\n<\/li>\n<li class=\"l\"> Tra le funzionalit\u00e0 supportate da SQL ci sono indici, funzioni di aggregazione, espressioni GROUP BY, ORDER BY, DISTINCT, join (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), viste, funzioni di finestra e subquery. Le funzionalit\u00e0 fornite sono sufficienti per l'organizzazione di web-app come PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> e WordPress;\n<\/li>\n<li class=\"l\"> Scalabilit\u00e0 orizzontale e tolleranza ai guasti: la dimensione dello storage e la potenza di calcolo possono essere aumentate semplicemente aggiungendo nuovi nodi. I dati vengono distribuiti tra i nodi con ridondanza, consentendo il proseguimento delle operazioni in caso di guasto di nodi singoli. I guasti vengono gestiti automaticamente.\n<\/li>\n<li class=\"l\"> Il sistema garantisce coerenza e per il software client appare come un grande database, nonostante i dati necessari per eseguire le transazioni provengano da pi\u00f9 nodi.\n<\/li>\n<li class=\"l\"> Per l'archiviazione fisica dei dati sui nodi possono essere utilizzati diversi backend, come i motori di archiviazione locali GoLevelDB e BoltDB o il proprio motore di archiviazione distribuita. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex>.\n<\/li>\n<li class=\"l\"> Possibilit\u00e0 di modificare in modo asincrono lo schema di archiviazione, consentendo di aggiungere colonne e indici al volo senza interrompere l'elaborazione delle operazioni attuali.\n<\/ul>\n<p>Principali <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/releases\/tag\/v3.0.0\">novit\u00e0<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> \u041f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0430 \u043f\u043e \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u044e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438. \u0412 \u0442\u0435\u0441\u0442\u0435  Sysbench \u0432\u044b\u043f\u0443\u0441\u043a 3.0  \u043e\u043f\u0435\u0440\u0435\u0436\u0430\u0435\u0442 \u0432\u0435\u0442\u043a\u0443 2.1 \u0432 1.5 \u0440\u0430\u0437\u0430 \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 select \u0438 update, \u0430 \u0432 \u0442\u0435\u0441\u0442\u0435  TPC-C  \u0432  4.5 \u0440\u0430\u0437\u0430. \u041e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0437\u0430\u0442\u0440\u043e\u043d\u0443\u043b\u0438 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0432\u0438\u0434\u044b \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043f\u043e\u0434\u0437\u0430\u043f\u0440\u043e\u0441\u044b &#171;IN&#187;, &#171;DO&#187; \u0438 &#171;NOT EXISTS&#187;, \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0441\u043b\u0438\u044f\u043d\u0438\u044f \u0442\u0430\u0431\u043b\u0438\u0446 (JOIN), \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435  \u0438\u043d\u0434\u0435\u043a\u0441\u043e\u0432 \u0438 \u043c\u043d\u043e\u0433\u043e\u0435 \u0434\u0440\u0443\u0433\u043e\u0435;<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=\"Rilascio del database distribuito TiDB 3.0 \" 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=\"Rilascio del database distribuito TiDB 3.0 \" src=\"\/wp-content\/uploads\/2019\/07\/89768360adce73a07b9248cf286053bd.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<li class=\"l\"> \u00c8 stato aggiunto un nuovo motore di archiviazione, TiFlash, che garantisce prestazioni superiori per le attivit\u00e0 analitiche (OLAP), grazie all'archiviazione basata su colonne. TiFlash si affianca al precedente sistema di archiviazione TiKV, che memorizza i dati come righe in formato chiave\/valore ed \u00e8 pi\u00f9 ottimale per le operazioni di transazione (OLTP). TiFlash lavora in sinergia con TiKV e i dati vengono ancora replicati in TiKV utilizzando il protocollo Raft per determinare il consenso; per ogni gruppo di repliche Raft viene creata una replica aggiuntiva utilizzata in TiFlash. Questo approccio permette una migliore separazione delle risorse tra le attivit\u00e0 OLTP e OLAP, rendendo i dati delle transazioni immediatamente disponibili per le query analitiche.\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/images\/blog\/tidb-htap-architecture-1.png\"><img decoding=\"async\" alt=\"Rilascio del database distribuito TiDB 3.0 \" src=\"\/wp-content\/uploads\/2019\/07\/ba4a4e5e9c9390c7db6fcdb4e88e7e40.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<li class=\"l\"> \u00c8 stato implementato un raccoglitore di rifiuti distribuito che consente di aumentare significativamente la velocit\u00e0 di raccolta dei rifiuti in ampi cluster e migliorare la stabilit\u00e0 operativa.\n<li class=\"l\"> \u00c8 stata aggiunta un'implementazione sperimentale di un sistema di controllo degli accessi basato su ruoli (RBAC). Inoltre, \u00e8 stata garantita la possibilit\u00e0 di definire i diritti di accesso per le operazioni ANALYZE, USE, SET GLOBAL e SHOW PROCESSLIST.\n<li class=\"l\"> \u00c8 stata introdotta la possibilit\u00e0 di utilizzare espressioni SQL per la selezione dal log delle query lente.\n<li class=\"l\"> \u00c8 stato implementato un meccanismo di ripristino rapido delle tabelle eliminate, che consente di recuperare dati cancellati per errore.\n<li class=\"l\"> Il formato dei log registrati \u00e8 stato unificato.\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per la modalit\u00e0 di blocco pessimistica, che rende l'elaborazione delle transazioni pi\u00f9 simile a MySQL.\n<li class=\"l\"> \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 (window-\u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0438\u043b\u0438 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438), \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u044b\u0445 \u0441 MySQL 8.0. \u041e\u043a\u043e\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u0434\u0440\u0443\u0433\u0438\u0435 \u0441\u0442\u0440\u043e\u043a\u0438. \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u0432\u0451\u0440\u0442\u044b\u0432\u0430\u044e\u0442 \u0441\u0433\u0440\u0443\u043f\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430\u0431\u043e\u0440 \u0441\u0442\u0440\u043e\u043a \u0432 \u043e\u0434\u043d\u0443 \u0441\u0442\u0440\u043e\u043a\u0443, \u043e\u043a\u043e\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u044f\u0442 \u0430\u0433\u0440\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e &#171;\u043e\u043a\u043d\u0430&#187;, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u043e\u0434\u043d\u0443 \u0438\u043b\u0438 \u0431\u043e\u043b\u0435\u0435 \u0441\u0442\u0440\u043e\u043a \u0438\u0437 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0438\u0440\u0443\u044e\u0449\u0435\u0433\u043e \u043d\u0430\u0431\u043e\u0440\u0430. \u0421\u0440\u0435\u0434\u0438 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439:<br \/>\nNTILE, LEAD, LAG, PERCENT_RANK, NTH_VALUE, CUME_DIST, FIRST_VALUE, LAST_VALUE, RANK, DENSE_RANK e ROW_NUMBER;<\/p>\n<li class=\"l\"> \u00c8 stata aggiunta il supporto sperimentale per le viste (VIEW);\n<li class=\"l\"> \u00c8 migliorato il sistema di partizionamento, aggiungendo la possibilit\u00e0 di distribuire i dati in base a intervalli di valori o hash;\n<li class=\"l\"> \u00c8 stato aggiunto un framework per lo sviluppo di plugin, ad esempio, sono gi\u00e0 disponibili plugin per l'uso di una lista bianca di IP o per la registrazione di audit;\n<li class=\"l\"> \u041e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0430 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u0430\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 &#171;EXPLAIN ANALYZE&#187; \u0434\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u043f\u043b\u0430\u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f SQL-\u0437\u0430\u043f\u0440\u043e\u0441\u0430 (SQL Plan Management);\n<li class=\"l\">  \u00c8 stato aggiunto il comando next_row_id per ottenere l'identificativo della prossima riga;\n<li class=\"l\"> Sono state aggiunte nuove funzioni integrate JSON_QUOTE, JSON_ARRAY_APPEND, JSON_MERGE_PRESERVE, BENCHMARK, COALESCE e NAME_CONST.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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. 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TiDB appartiene alla categoria dei sistemi ibridi HTAP (Hybrid Transactional\/Analytical Processing), capaci di eseguire transazioni in tempo reale (OLTP) e di elaborare richieste analitiche. Il progetto \u00e8 scritto in Go e distribuito con licenza Apache 2.0. 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