{"id":78346,"date":"2020-04-18T19:42:08","date_gmt":"2020-04-18T17:42:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-subd-timescaledb-1-7"},"modified":"2020-04-18T19:42:08","modified_gmt":"2020-04-18T17:42:08","slug":"vypusk-subd-timescaledb-1-7","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/vypusk-subd-timescaledb-1-7","title":{"rendered":"Rilascio del DBMS TimescaleDB 1.7","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/timescale\/timescaledb\/releases\/tag\/1.7.0\">Pubblicato<\/a><\/noindex>   rilascio del DBMS <noindex><a rel=\"nofollow\" href=\"https:\/\/www.timescale.com\">TimescaleDB 1.7<\/a><\/noindex>, progettato per memorizzare e elaborare dati sotto forma di serie temporali (rappresentazioni di valori di parametri a intervalli di tempo prestabiliti, dove il timestamp forma il tempo e il set di valori corrispondenti a quel tempo). Questa forma di memorizzazione \u00e8 ottimale per applicazioni come sistemi di monitoraggio, piattaforme di trading, sistemi di raccolta metriche e stati dei sensori. Sono forniti strumenti per l'integrazione con il progetto <noindex><a rel=\"nofollow\" href=\"https:\/\/grafana.com\/\">Grafana<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/prometheus.io\/\">Prometheus<\/a><\/noindex>. <\/p>\n<p>Il progetto TimescaleDB \u00e8 implementato come un'estensione di PostgreSQL e <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/timescale\/timescaledb\">\u00e8 distribuito<\/a><\/noindex> sotto licenza Apache 2.0. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/timescale\/timescaledb\/tree\/master\/tsl\">Parte del codice<\/a><\/noindex> con funzionalit\u00e0 avanzate \u00e8 fornita sotto una licenza proprietaria separata <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/timescale\/timescaledb\/blob\/master\/tsl\/LICENSE-TIMESCALE\">Timescale<\/a><\/noindex> (TSL), che non consente modifiche, vieta l'uso del codice in prodotti di terze parti e non permette l'uso gratuito in database cloud (database-as-a-service). <\/p>\n<p>Tra le modifiche in TimescaleDB 1.7:<\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per l'integrazione con DBMS <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51604\">PostgreSQL 12<\/a><\/noindex>. \u00c8 stata dichiarata obsoleta la supporto per PostgreSQL 9.6.x e 10.x (in Timescale 2.0 rimarr\u00e0 supporto solo per PostgreSQL 11+).\n<li class=\"l\"> \u00c8 stato modificato il comportamento delle query con funzioni di aggregazione in esecuzione continua (aggregazione di dati in tempo reale continuamente in arrivo). Queste query ora combinano viste materializzate con dati recentemente arrivati, che non sono ancora stati materializzati (in precedenza l'aggregazione copriva solo i dati gi\u00e0 materializzati). Il nuovo comportamento si applica agli aggregati continui di nuova creazione, per le viste esistenti \u00e8 necessario impostare il parametro &#171;timescaledb.materialized_only=false&#187; tramite &#171;ALTER VIEW&#187;.\n<li class=\"l\"> Nella versione Community sono stati trasferiti dalla versione commerciale alcuni strumenti avanzati per la gestione del ciclo di vita dei dati, comprese le capacit\u00e0 di raggruppamento dei dati e la gestione delle politiche di espulsione dei dati obsoleti (consentono di conservare solo dati attuali e di eliminare, aggregare o archiviare automaticamente le registrazioni obsolete).\n<\/ul>\n<p>Ricordiamo che il database TimescaleDB consente di utilizzare vere query SQL per analizzare i dati accumulati, combinando la facilit\u00e0 d'uso tipica dei database relazionali con la scalabilit\u00e0 e le funzionalit\u00e0 proprie dei sistemi NoSQL specializzati. La struttura di archiviazione \u00e8 ottimizzata per garantire alte velocit\u00e0 di inserimento dei dati. \u00c8 supportato l'inserimento batch di set di dati, l'uso di indici in memoria, il caricamento di campioni storici retroattivi e l'applicazione di transazioni.<\/p>\n<p>Una caratteristica chiave di TimescaleDB \u00e8 il supporto per il partizionamento automatico dei dati. Il flusso di dati in ingresso viene automaticamente distribuito su tabelle partizionate. Le partizioni vengono create in base al tempo (in ciascuna partizione si conservano i dati per un determinato intervallo di tempo) o legate a una chiave arbitraria (ad esempio, l'ID del dispositivo, la posizione, ecc.). Per ottimizzare le prestazioni, le tabelle partizionate possono essere distribuite su dischi diversi. <\/p>\n<p>Per le query, il database partizionato appare come una grande tabella, chiamata ipertabella. L'ipertabella rappresenta una vista virtuale di molte tabelle separate, in cui vengono accumulati i dati in arrivo. L'ipertabella non \u00e8 utilizzata solo per le query e l'aggiunta di dati, ma anche per operazioni come la creazione di indici e la modifica della struttura (&#171;ALTER TABLE&#187;), nascondendo allo sviluppatore la struttura segmentata a basso livello del database. Con l'ipertabella \u00e8 possibile utilizzare qualsiasi funzione aggregata, sottoclassi, operazioni di join con tabelle normali e funzioni finestre.<\/p>\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=52759\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0421\u0423\u0411\u0414 TimescaleDB 1.7, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0439 \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0444\u043e\u0440\u043c\u0435 \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u044f\u0434\u0430 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[&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-78346","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=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0421\u0423\u0411\u0414 TimescaleDB.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/news\/vypusk-subd-timescaledb-1-7\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" 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