{"id":113031,"date":"2024-01-21T17:28:02","date_gmt":"2024-01-21T15:28:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-subd-sqlite-3-45"},"modified":"2024-01-21T17:28:02","modified_gmt":"2024-01-21T15:28:02","slug":"vypusk-subd-sqlite-3-45","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-subd-sqlite-3-45","title":{"rendered":"Uscita del DBMS SQLite 3.45","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata pubblicata la versione 3.45 di SQLite, un sistema di gestione di database leggero realizzato come libreria collegabile. Il codice di SQLite \u00e8 distribuito come pubblico dominio, il che significa che pu\u00f2 essere utilizzato senza restrizioni e gratuitamente per qualsiasi scopo. Il supporto finanziario per gli sviluppatori di SQLite \u00e8 fornito da un consorzio creato appositamente, composto da aziende come Bentley, Bloomberg, Expensify e Navigation Data Standard.    <\/p>\n<p>Principali modifiche:  <\/p>\n<ul>\n<li class=\"l\"> Tutte le funzioni SQL per lavorare con il formato JSON sono state riscritte e convertite in un nuovo formato interno ad albero di analisi JSONB, che viene serializzato e pu\u00f2 essere memorizzato nel database per evitare il ri-analisi quando si utilizzano valori JSON. Le nuove versioni delle funzioni che formano JSON generano ora un formato binario JSONB invece di quello testuale. \u00c8 stato aggiunto un secondo argomento facoltativo alla funzione json_valid(), attraverso il quale \u00e8 possibile fornire una maschera di bit che definisce le caratteristiche di un JSON valido (ad esempio, specificando 0x04, un blob JSONB sar\u00e0 considerato valido, specificando 0x01, un JSON testuale in formato RFC-8259, e specificando 0x05, entrambi i formati).\n<li class=\"l\"> Nella tabella virtuale FTS5, utilizzata per la ricerca full-text, \u00e8 stata aggiunta l'opzione tokendata, che consente di utilizzare tokenizer personalizzati.\n<li class=\"l\"> Per impostazione predefinita, \u00e8 stata abilitata l'ottimizzazione SQLITE_DIRECT_OVERFLOW_READ, in cui le pagine di overflow, di dimensioni superiori alla dimensione standard di una pagina b-tree, vengono lette direttamente dal file, bypassando la cache. Per disabilitare questa funzione durante la compilazione, si pu\u00f2 utilizzare l'opzione \u00ab-DSQLITE_DIRECT_OVERFLOW_READ=0\u00bb.\n<li class=\"l\"> Nello scheduler delle query \u00e8 stata migliorata l'efficacia dell'ottimizzazione dei vincoli transitivi e migliorato l'ignoramento degli indici ritenuti di bassa qualit\u00e0 durante l'esecuzione dell'operazione ANALYZE.\n<li class=\"l\"> Nell'interfaccia della riga di comando \u00e8 stato migliorato il display del contenuto in codifica UTF-8 sulla piattaforma Windows. \u00c8 stato garantito il riconoscimento automatico dell'utilizzo dell'interfaccia CLI durante l'esecuzione degli script \u00ab.dump\u00bb e l'applicazione delle relative modifiche alle impostazioni, come \u00ab.dbconfig defensive off\u00bb e \u00ab.dbconfig dqs_dll on\u00bb.\n<li class=\"l\"> Nelle funzioni SQL definite a livello dell'applicazione \u00e8 stata aggiunta la propriet\u00e0 SQLITE_RESULT_SUBTYPE, che consente di chiamare la funzione sqlite3_result_subtype() per ispezionare i sottotipi degli argomenti.      <\/ul>\n<p>Inoltre, si pu\u00f2 notare lo sviluppo in versioni sperimentali di SQLite di una nuova modalit\u00e0 di registrazione delle transazioni - WAL2 (\u00abPRAGMA journal_mode = wal2\u00bb), in cui vengono utilizzati due file wal (\u00abdatabase-wal\u00bb e \u00abdatabase-wal2\u00bb) invece di uno. Durante la scrittura di dati nel database, vengono aggiunti nuovi dati al primo file wal. Se il primo file wal raggiunge dimensioni sufficientemente grandi, si passa alla scrittura nel secondo file. Dopo il passaggio al secondo file wal, il primo diventa disponibile per la registrazione delle modifiche (checkpoint) e la riscrittura. Pertanto, quando il secondo file wal raggiunge dimensioni elevate, si torna al primo e cos\u00ec via, il che risolve il problema della crescita incontrollata del file wal in situazioni in cui una transazione non viene registrata a lungo o vengono eseguite lunghe operazioni di lettura.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60460\">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 \u0440\u0435\u043b\u0438\u0437 SQLite 3.45, \u043b\u0435\u0433\u043a\u043e\u0432\u0435\u0441\u043d\u043e\u0439 \u0421\u0423\u0411\u0414, \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 \u0432\u0438\u0434\u0435 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0430\u0435\u043c\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438. \u041a\u043e\u0434 SQLite \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0434\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 (public domain), \u0442.\u0435. \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0431\u0435\u0437 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439 \u0438 \u0431\u0435\u0437\u0432\u043e\u0437\u043c\u0435\u0437\u0434\u043d\u043e \u0432 \u043b\u044e\u0431\u044b\u0445 \u0446\u0435\u043b\u044f\u0445. \u0424\u0438\u043d\u0430\u043d\u0441\u043e\u0432\u0443\u044e \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 SQLite \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u044b\u0439 \u043a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432\u0445\u043e\u0434\u044f\u0442 \u0442\u0430\u043a\u0438\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, \u043a\u0430\u043a Bentley, Bloomberg, Expensify \u0438 Navigation Data Standard. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0412\u0441\u0435 SQL-\u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043b\u044f [&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-113031","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All 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