{"id":82740,"date":"2020-05-24T19:42:08","date_gmt":"2020-05-24T17:42:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-subd-sqlite-3-32-proekt-duckdb-razvivaet-variant-sqlite-dlya-analiticheskih-zaprosov"},"modified":"2020-05-24T19:42:08","modified_gmt":"2020-05-24T17:42:08","slug":"reliz-subd-sqlite-3-32-proekt-duckdb-razvivaet-variant-sqlite-dlya-analiticheskih-zaprosov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/reliz-subd-sqlite-3-32-proekt-duckdb-razvivaet-variant-sqlite-dlya-analiticheskih-zaprosov","title":{"rendered":"Release van de SQLite DBMS 3.32. Het DuckDB-project ontwikkelt een variant van SQLite voor analytische queries.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/changes.html\">Gepubliceerd<\/a><\/noindex> release <noindex><a rel=\"nofollow\" href=\"http:\/\/sqlite.org\/\">SQLite 3.32.0<\/a><\/noindex>, een lichtgewicht DBMS, ge\u00efmplementeerd als een in te laden bibliotheek. De code van SQLite is openbaar domein (public domain), wat betekent dat deze zonder beperkingen en kosteloos voor alle doeleinden kan worden gebruikt. De financi\u00eble ondersteuning voor de ontwikkelaars van SQLite wordt verstrekt door een speciaal opgerichte consortium, dat bedrijven zoals Adobe, Oracle, Mozilla, Bentley en Bloomberg omvat. <\/p>\n<p>Belangrijkste <noindex><a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/releaselog\/3_32_0.html\">wijzigingen<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> Ge\u00efmplementeerd <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/lang_analyze.html#approx\">gefaciliteerd<\/a><\/noindex> De ANALYZE-commando-optie die het mogelijk maakt om bij zeer grote databases gedeeltelijke statistieken te verzamelen zonder volledige indexscans. De beperking van het aantal records bij het scannen van \u00e9\u00e9n index wordt ingesteld met behulp van de nieuwe directive &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/pragma.html#pragma_analysis_limit\">PRAGMA analysis_limit<\/a><\/noindex>&#171;.\n<li class=\"l\"> Een nieuwe virtuele tabel toegevoegd &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/bytecodevtab.html\">bytecode<\/a><\/noindex>&#171;, waarin informatie wordt aangeboden over <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/opcode.html\">bytecode<\/a><\/noindex> van vooraf voorbereide expressies (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/c3ref\/stmt.html\">prepared statement<\/a><\/noindex>).\n<li class=\"l\"> Een nieuwe VFS-laag is toegevoegd <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/cksumvfs.html\">checksum<\/a><\/noindex>, die 8-byte checksums aan het einde van elke gegevenspagina in de database toevoegt en deze controleert bij elke lezing uit de database. De laag maakt het mogelijk om databasebeschadigingen te detecteren als gevolg van willekeurige bitverdraaiingen in opslagmedia.\n<li class=\"l\"> Een nieuwe SQL-functie is toegevoegd <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/lang_corefunc.html#iif\">iif(X,Y,Z)<\/a><\/noindex>, die waarde Y retourneert als de expressie X waar is, of Z in andere gevallen.\n<li class=\"l\"> In de INSERT- en UPDATE-uitdrukkingen wordt nu altijd <noindex><a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/info\/86ba67afafded936\">toegepast<\/a><\/noindex> kolom typebinding (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/datatype3.html#affinity\">column affinity<\/a><\/noindex>) v\u00f3\u00f3r het berekenen van de voorwaarden in de <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/lang_createtable.html#ckconst\">CHECK<\/a><\/noindex>.\n<li class=\"l\"> De limiet op het aantal parameters is verhoogd van 999 naar 32766.\n<li class=\"l\"> Een uitbreiding is toegevoegd <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/uintcseq.html\">UINT collating sequence<\/a><\/noindex> met een implementatie van een sortering die rekening houdt met gehele getallen in tekst om deze tekst numeriek te sorteren.\n<li class=\"l\"> In de opdrachtregelinterface zijn de opties &#171;&#8212;csv&#187;, &#171;&#8212;ascii&#187; en &#171;&#8212;skip&#187; toegevoegd aan de opdracht &#171;.import&#187;. Bij de opdracht &#171;.dump&#187; is het toegestaan om meerdere LIKE-patronen te gebruiken waarmee alle tabellen die overeenkomen met de opgegeven maskers worden samengevoegd. De opdracht &#171;.oom&#187; is toegevoegd voor debugbuilds. De opdrachten &#171;.excel&#187;, &#171;.output&#187; en &#171;.once&#187; hebben de optie &#171;&#8212;bom&#187; toegevoegd. Aan de opdracht &#171;.filectrl&#187; is de optie &#171;&#8212;schema&#187; toegevoegd.\n<li class=\"l\"> De met de LIKE-operator opgegeven expressie ESCAPE overschrijft nu de jokertekens, wat overeenkomt met het gedrag van PostgreSQL.\n<\/ul>\n<p>Daarnaast kan de ontwikkeling van een nieuwe DBMS worden opgemerkt <noindex><a rel=\"nofollow\" href=\"https:\/\/www.duckdb.org\/\">DuckDB<\/a><\/noindex>, waarin een variant van SQLite wordt ontwikkeld die is geoptimaliseerd voor uitvoering. <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/OLAP\">analytische aanvragen<\/a><\/noindex>.<br \/>\nNaast de shellcode uit SQLite maakt het project gebruik van een afzonderlijke bibliotheek parser uit PostgreSQL, de Date Math-component van <noindex><a rel=\"nofollow\" href=\"https:\/\/www.monetdb.org\/\">MonetDB<\/a><\/noindex>, een eigen implementatie van vensterfuncties (op basis van het Segment Tree Aggregation-algoritme), een gevectoriseerde engine voor query-uitvoering (op basis van het Hyper-Pipelining Query Execution-algoritme), een reguliere expressie-handler gebaseerd op de bibliotheek <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=25765\">RE2<\/a><\/noindex>, eigen query-optimalisatoren en een MVCC-mechanisme voor het beheer van gelijktijdige taakuitvoering (Multi-Version Concurrency Control).<br \/>\nDe code van het project <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cwida\/duckdb\">wordt verspreid<\/a><\/noindex> onder de MIT-licentie. De ontwikkeling bevindt zich nog in de fase van <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cwida\/duckdb\/releases\">vorming<\/a><\/noindex> experimentele releases.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53018\">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 3.32.0, \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 Adobe, Oracle, Mozilla, Bentley \u0438 Bloomberg. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0420\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d \u0430\u043f\u043f\u0440\u043e\u043a\u0441\u0438\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043a\u043e\u043c\u0430\u043d\u0434\u044b [&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-82740","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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