{"id":38636,"date":"2019-10-31T22:24:58","date_gmt":"2019-10-31T19:24:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-subd-postgresql-12\/"},"modified":"2019-10-31T22:24:58","modified_gmt":"2019-10-31T19:24:58","slug":"reliz-subd-postgresql-12","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-subd-postgresql-12","title":{"rendered":"Rilascio del DBMS PostgreSQL 12","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo un anno di sviluppo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/about\/news\/1976\/\">pubblicata<\/a><\/noindex> nuova branch stabile del DBMS PostgreSQL 12. Aggiornamenti per la nuova branch <noindex><a rel=\"nofollow\" href=\"http:\/\/www.postgresql.org\/support\/versioning\/\">usciranno<\/a><\/noindex> per cinque anni fino a novembre 2024. <\/p>\n<p>Principali <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/static\/release-12.html\">novit\u00e0<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata aggiunta la supporto \u00ab<noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/ddl-generated-columns.html\">colonne generate<\/a><\/noindex>\u00ab, il cui valore \u00e8 calcolato sulla base di un'espressione che copre i valori di altre colonne nella stessa tabella (simile alle viste, ma per colonne singole). Le colonne generate possono essere di due tipi: memorizzate e virtuali. Nel primo caso, il valore \u00e8 calcolato al momento dell'aggiunta o modifica dei dati, mentre nel secondo caso \u2014 ad ogni lettura, basandosi sullo stato corrente delle altre colonne. Attualmente, in PostgreSQL sono supportate solo colonne generate memorizzate;\n<li class=\"l\"> Aggiunta la possibilit\u00e0 di eseguire interrogazioni di dati da documenti JSON tramite <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/functions-json.html#FUNCTIONS-SQLJSON-PATH\">espressioni Path<\/a><\/noindex>, simili a <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/XPath\">XPath<\/a><\/noindex> e definite nello standard SQL\/JSON. Per migliorare l'efficienza dell'elaborazione di tali espressioni per documenti memorizzati in formato JSONB, vengono utilizzati meccanismi di indicizzazione esistenti;\n<li class=\"l\"> \u00c8 attivata di default l'applicazione del compilatore JIT (Just-in-Time) basato sui progressi di LLVM per accelerare l'esecuzione di alcune espressioni durante l'elaborazione delle query SQL. Ad esempio, il JIT \u00e8 applicabile per accelerare l'esecuzione di espressioni all'interno di blocchi \u00abWHERE\u00bb, nelle liste di uscita (target lists), nelle espressioni aggregative e in alcune operazioni interne;\n<li class=\"l\"> Le prestazioni di indicizzazione sono state significativamente migliorate. Gli indici B-tree sono stati ottimizzati per operare in condizioni di frequenti modifiche agli indici \u2014 nei test TPC-C si osserva un aumento generale delle prestazioni e una riduzione della necessit\u00e0 di spazio su disco in media del 40%. Le spese generali per la generazione del log di scrittura anticipata (WAL) per gli indici GiST, GIN e SP-GiST sono state ridotte. Per il GiST \u00e8 stata aggiunta la possibilit\u00e0 di creare indici di inclusione (attraverso l'espressione INCLUDE) che comprendono colonne aggiuntive. Nella operazione <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/sql-createstatistics.html\">CREATE STATISTICS<\/a><\/noindex> \u00e8 stata introdotta la supporto per la statistica sui valori pi\u00f9 comuni (MCV), che consente di generare piani di query pi\u00f9 ottimali quando si utilizzano colonne distribuite in modo non uniforme;\n<li class=\"l\"> L'implementazione della partizionamento \u00e8 stata ottimizzata per le query che coprono tabelle con migliaia di partizioni, mentre si limitano a un sottoinsieme ristretto di dati. \u00c8 stata aumentata la capacit\u00e0 di aggiungere dati a tabelle partizionate tramite le operazioni INSERT e COPY, e sono state implementate nuove partizioni attraverso 'ALTER TABLE ATTACH PARTITION' senza bloccare l'esecuzione delle query;\n<li class=\"l\"> Aggiunta la supporto per il dispiegamento automatico inline delle espressioni tabulari comuni (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/queries-with.html\">Common Table Expression<\/a><\/noindex>, CTE), che permettono di utilizzare set di risultati temporanei denominati definiti tramite l'operatore WITH. Il dispiegamento inline consente di migliorare le prestazioni della maggior parte delle query, ma attualmente \u00e8 applicabile solo a CTE non ricorsivi;\n<li class=\"l\"> Aggiunto supporto per <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/collation.html#COLLATION-NONDETERMINISTIC\">indeterminati<\/a><\/noindex> propriet\u00e0 della localit\u00e0 &#171;Collation&#187;, che permette di definire le regole di ordinamento e i metodi di confronto tenendo conto del significato dei caratteri (ad esempio, durante l'ordinamento dei valori numerici si considera la presenza di un segno meno e di un punto davanti al numero e dei diversi modi di scrittura, mentre durante il confronto non si tiene conto del registro dei caratteri e della presenza di segni diacritici);\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per l'autenticazione multifattoriale del cliente, in cui \u00e8 possibile combinare l'autenticazione tramite certificato SSL (clientcert=verify-full) con un metodo di autenticazione aggiuntivo, come scram-sha-256, nel pg_hba.conf;\n<li class=\"l\"> \u00c8 stata aggiunta la supporto per la crittografia del canale durante l'autenticazione tramite <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/gssapi-auth.html\">GSSAPI<\/a><\/noindex>, sia dal lato client che dal lato server;\n<li class=\"l\"> Aggiunta la supporto per la definizione dei server LDAP basata su record &#171;DNS SRV&#187;, se PostgreSQL \u00e8 stato compilato con OpenLDAP;\n<li class=\"l\"> Aggiunta l'operazione &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/sql-reindex.html#SQL-REINDEX-CONCURRENTLY\">REINDEX CONCURRENTLY<\/a><\/noindex>&#187; per la ricostruzione degli indici senza bloccare le operazioni di scrittura nell'indice;\n<li class=\"l\"> \u00c8 stato aggiunto il comando <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/app-pgchecksums.html\">pg_checksums<\/a><\/noindex>, che consente di attivare e disattivare il controllo dei checksum delle pagine dati per un database esistente (in precedenza questa operazione era supportata solo durante l'inizializzazione del database);\n<li class=\"l\"> \u00c8 stata garantita l'uscita di un indicatore di progresso durante le operazioni CREATE INDEX, REINDEX, CLUSTER, VACUUM FULL e pg_checksums;\n<li class=\"l\"> Aggiunta il comando &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/tableam.html\">CREATE ACCESS METHOD<\/a><\/noindex>&#187; per collegare i gestori di nuovi metodi di archiviazione delle tabelle, ottimizzati per vari compiti specifici. Attualmente, l'unico metodo di accesso integrato alle tabelle \u00e8 &#171;heap&#187;;\n<li class=\"l\"> Il file di configurazione recovery.conf \u00e8 stato unito a postgresql.conf. Ora, per indicare il passaggio a uno stato di ripristino dopo un guasto, \u00e8 necessario usare i file recovery.signal e standby.signal. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.postgresql.org\/docs\/12\/runtime-config-wal.html#RUNTIME-CONFIG-WAL-ARCHIVE-RECOVERY\">\u00e8 necessario<\/a><\/noindex> utilizzare i file recovery.signal e standby.signal.\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=51604\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0433\u043e\u0434\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u0430\u044f \u0432\u0435\u0442\u043a\u0430 \u0421\u0423\u0411\u0414 PostgreSQL 12. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u0431\u0443\u0434\u0443\u0442 \u0432\u044b\u0445\u043e\u0434\u0438\u0442\u044c \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u043f\u044f\u0442\u0438 \u043b\u0435\u0442 \u0434\u043e \u043d\u043e\u044f\u0431\u0440\u044f 2024 \u0433\u043e\u0434\u0430. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 &#171;\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432&#171;, \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f, \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432 \u0432 \u0442\u043e\u0439 \u0436\u0435 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 (\u0430\u043d\u0430\u043b\u043e\u0433 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0439, \u043d\u043e \u0434\u043b\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432). \u0413\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0441\u0442\u043e\u043b\u0431\u0446\u044b \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0434\u0432\u0443\u0445 [&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-38636","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=\"\u041f\u043e\u0441\u043b\u0435 \u0433\u043e\u0434\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u0430\u044f \u0432\u0435\u0442\u043a\u0430 \u0421\u0423\u0411\u0414 PostgreSQL 12. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u043d\u043e\u0432\u043e\u0439 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PostgreSQL 12. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u0431\u0443\u0434\u0443\u0442 \u0432\u044b\u0445\u043e\u0434\u0438\u0442\u044c \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u043f\u044f\u0442\u0438 \u043b\u0435\u0442 \u0434\u043e \u043d\u043e\u044f\u0431\u0440\u044f 2024 \u0433\u043e\u0434\u0430. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 &quot;\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432&quot;, \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f, \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432 \u0432 \u0442\u043e\u0439 \u0436\u0435 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 (\u0430\u043d\u0430\u043b\u043e\u0433 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0439, \u043d\u043e \u0434\u043b\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432). \u0413\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0441\u0442\u043e\u043b\u0431\u0446\u044b \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0434\u0432\u0443\u0445\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-subd-postgresql-12\" \/>\n\t\t<meta property=\"og:image\" 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Gli aggiornamenti per il nuovo ramo continueranno ad essere rilasciati per cinque anni fino a novembre 2024. Le principali novit\u00e0: \u00e8 stata aggiunta la supporto per \"colonne generate\", i cui valori vengono calcolati sulla base di un'espressione che considera i valori di altre colonne nella stessa tabella (simile a viste, ma per colonne singole). 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