{"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\/it\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"Rilascio del database distribuito 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\">Disponibile<\/a><\/noindex> rilascio di un database distribuito <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/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 lo storage fisico dei dati sui nodi possono essere utilizzati diversi backend, come i motori di storage locali GoLevelDB e BoltDB o i propri motori di storage distribuito <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex> e TiFlash. TiKV memorizza i dati in formato chiave\/valore a livello di riga ed \u00e8 pi\u00f9 ottimizzato per le operazioni di elaborazione delle transazioni (OLTP). TiFlash memorizza i dati a livello di colonna e offre prestazioni pi\u00f9 elevate per le attivit\u00e0 analitiche (OLAP).\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<\/li>\n<\/ul>\n<p>Nel nuovo rilascio:<\/p>\n<ul>\n<li class=\"l\"> Di default \u00e8 attivo un garbage collector distribuito chiamato Green GC, che consente di aumentare notevolmente la velocit\u00e0 di raccolta dei rifiuti nei grandi cluster e migliora la stabilit\u00e0 operativa;\n<li class=\"l\">\u00c8 stata aggiunta la supporto per grandi transazioni, il cui dimensione \u00e8 limitato praticamente alla dimensione della memoria fisica. Il limite per una singola transazione \u00e8 stato aumentato da 100 MB a 10 GB;\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per i comandi BACKUP e RESTORE per il backup dei dati;\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di impostare lock sulle tabelle;\n<li class=\"l\"> \u00c8 stato aggiunto un meccanismo di isolamento delle transazioni compatibile con MySQL a livello di lettura (READ COMMITTED);\n<li class=\"l\"> Nel comando &#171;ADMIN SHOW DDL JOBS&#187; \u00e8 stata aggiunta la supporto per espressioni LIKE e WHERE;\n<li class=\"l\"> \u00c8 stato aggiunto il parametro oom-use-tmp-storage, che permette di utilizzare file temporanei per la memorizzazione nella cache dei risultati intermedi in caso di carenza di memoria;\n<li class=\"l\"> \u00c8 stata aggiunta la parola chiave Random per assegnare valori casuali agli attributi;\n<li class=\"l\"> Nel comando LOAD DATA \u00e8 stata aggiunta la possibilit\u00e0 di utilizzare espressioni esadecimali e binarie;\n<li class=\"l\"> Sono stati aggiunti 15 parametri per controllare il comportamento dell'ottimizzatore;\n<li class=\"l\"> Sono stati introdotti strumenti per la diagnostica delle prestazioni delle query SQL. \u00c8 stata aggiunta un registro delle query lente, accessibile tramite le tabelle di sistema SLOW_QUERY \/ CLUSTER_SLOW_QUERY;\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per funzioni di lavoro con sequenze;\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di modificare dinamicamente i parametri di configurazione letti da PD (Placement Driver, server di gestione del cluster). \u00c8 possibile utilizzare l'espressione &#171;SET CONFIG&#187; per modificare le impostazioni dei nodi PD\/TiKV.\n<li class=\"l\"> \u00c8 stata aggiunta l'impostazione max-server-connections per limitare il numero massimo di connessioni simultanee al server (di default 4096);\n<li class=\"l\"> \u00c8 stata migliorata la prestazione in situazioni in cui le colonne richieste sono completamente coperte dagli indici;\n<li class=\"l\"> \u00c8 stata aggiunta un'ottimizzazione delle query basata sulla fusione degli indici;\n<li class=\"l\"> Sono state migliorate le prestazioni delle operazioni su intervalli di valori;\n<li class=\"l\"> \u00c8 stata ridotta la pressione sulla CPU grazie alla memorizzazione nella cache dei risultati delle query sugli indici e all'eliminazione dei duplicati;\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per un nuovo formato di memorizzazione delle righe, che consente di incrementare le prestazioni delle tabelle con un numero elevato di colonne;\n<li class=\"l\"> Nella funzione GROUP_CONCAT \u00e8 stata aggiunta la supporto per l'espressione &#171;ORDER BY&#187;;\n<li class=\"l\"> \u00c8 stata introdotta la possibilit\u00e0 di estrarre dati dai log di TiFlash tramite SQL;\n<li class=\"l\"> Nel comando &#171;RECOVER TABLE&#187; \u00e8 stata implementata la supporto per il recupero di tabelle troncate;\n<li class=\"l\"> \u00c8 stata aggiunta una tabella di sistema DDLJobs per richiedere dettagli sull'esecuzione delle operazioni DDL;\n<li class=\"l\"> \u00c8 stata introdotta la possibilit\u00e0 di utilizzare il comando SHOW CONFIG per visualizzare le impostazioni di PD e TiKV;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">Abilitato<\/a><\/noindex>  di default la cache del coprocessore;\n<li class=\"l\"> Il numero di goroutines nella fase di tentativi di commit pu\u00f2 ora essere controllato tramite l'impostazione committer-concurrency;\n<li class=\"l\"> \u00c8 stata introdotta la possibilit\u00e0 di visualizzare le regioni delle partizioni delle tabelle;\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di limitare la dimensione dello storage temporaneo nel tidb-server;\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per le operazioni &#171;insert into tbl_name partition(partition_name_list)&#187; e &#171;replace into tbl_name partition(partition_name_list)&#187;;\n<li class=\"l\"> Nel hash utilizzato per il partizionamento \u00e8 stata aggiunta la supporto per il filtraggio per il criterio &#171;is null&#187;;\n<li class=\"l\"> Per le tabelle partizionate \u00e8 stata aggiunta la supporto per le operazioni di controllo, pulizia e recupero degli indici.\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=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-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 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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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\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-05-28T23:42:10+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-05-28T23:42:10+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Rilascio del DBMS distribuito TiDB 4.0 | ProHoster","description":"\u00c8 disponibile il rilascio del DBMS distribuito TiDB 4.0, sviluppato ispirandosi alle tecnologie Google Spanner e F1. TiDB appartiene alla categoria dei sistemi ibridi HTAP (Hybrid Transactional\/Analytical Processing), in grado di gestire le transazioni in tempo reale (OLTP) e di elaborare query analitiche. Il progetto \u00e8 scritto in Go e distribuito con licenza Apache 2.0. 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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","og:url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2020-05-28T23:42:10+00:00","article:modified_time":"2020-05-28T23:42:10+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"83153","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 15:24:25","updated":"2022-09-28 02:50:21"},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/83153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/comments?post=83153"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/83153\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/media?parent=83153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/categories?post=83153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/tags?post=83153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}