{"id":121901,"date":"2025-02-13T14:22:07","date_gmt":"2025-02-13T12:22:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-subd-duckdb-1-2-0"},"modified":"2025-02-13T14:22:07","modified_gmt":"2025-02-13T12:22:07","slug":"reliz-subd-duckdb-1-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/reliz-subd-duckdb-1-2-0","title":{"rendered":"Uvo\u013enenie datab\u00e1zov\u00e9ho syst\u00e9mu DuckDB 1.2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bol vydan\u00fd datab\u00e1zov\u00fd syst\u00e9m DuckDB 1.2.0, zameran\u00fd na vykon\u00e1vanie analytick\u00fdch dopytov a konceptu\u00e1lne podobn\u00fd SQLite. DuckDB kombinuje vlastnosti SQLite, ako s\u00fa kompaktnos\u0165, zabudovanie vo forme kni\u017enice, ulo\u017eenie datab\u00e1zy v jednom s\u00fabore a CLI rozhranie, s mo\u017enos\u0165ami a optimaliz\u00e1ciami na vykon\u00e1vanie analytick\u00fdch dopytov, ktor\u00e9 pokr\u00fdvaj\u00fa zna\u010dn\u00fa \u010das\u0165 ulo\u017een\u00fdch \u00fadajov, ako napr\u00edklad vykon\u00e1vanie agreg\u00e1cie cel\u00e9ho obsahu tabuliek alebo zl\u00fa\u010denie viacer\u00fdch ve\u013ek\u00fdch tabuliek. K\u00f3d projektu je nap\u00edsan\u00fd v C++ a je distribuovan\u00fd pod licenciou MIT.     <\/p>\n<p>DuckDB poskytuje roz\u0161\u00edren\u00fd dialekt jazyka SQL, ktor\u00fd obsahuje \u010fal\u0161ie mo\u017enosti pre spracovanie ve\u013emi zlo\u017eit\u00fdch a dlhodobo vykon\u00e1van\u00fdch dopytov. Je mo\u017en\u00e9 pou\u017e\u00edvanie zlo\u017eit\u00fdch typov (polia, \u0161trukt\u00fary, zlu\u010deniny), ako aj vykon\u00e1vanie \u013eubovo\u013en\u00fdch a vnoren\u00fdch korelovan\u00fdch poddopytov. Podporuje s\u00fa\u010dasn\u00e9 vykon\u00e1vanie viacer\u00fdch dopytov a vykon\u00e1vanie dopytov priamo zo s\u00faborov vo form\u00e1te CSV a Parquet. K dispoz\u00edcii je podpora importu z SDB PostgreSQL.    <\/p>\n<p>Projekt vyu\u017e\u00edva obal zo SQLite, parser z PostgreSQL, komponent Date Math z MonetDB, vlastn\u00fa implement\u00e1ciu oknov\u00fdch funkci\u00ed (na z\u00e1klade algoritmu Segment Tree Aggregation), spracovate\u013e regul\u00e1rnych v\u00fdrazov na z\u00e1klade kni\u017enice RE2, vlastn\u00fd optimaliz\u00e1tor dopytov, MVCC mechanizmus riadenia s\u00fa\u010dasn\u00e9ho vykon\u00e1vania \u00faloh (Multi-Version Concurrency Control) a tie\u017e vektorizovan\u00fd engine vykon\u00e1vania dopytov zalo\u017een\u00fd na algoritme Hyper-Pipelining Query Execution, ktor\u00fd umo\u017e\u0148uje v jednej oper\u00e1cii spracova\u0165 ve\u013ek\u00e9 mno\u017einy hodn\u00f4t.    <\/p>\n<p>V novej verzii:  <\/p>\n<ul>\n<li class=\"l\"> Bola implementovan\u00e1 podpora nov\u00fdch met\u00f3d kompresie, ktor\u00e9 nie s\u00fa predvolene povolen\u00e9 na zachovanie kompatibility s\u00faborov DB s predch\u00e1dzaj\u00facimi verziami DuckDB. Pre pou\u017eitie vylep\u0161en\u00e9ho form\u00e1tu s\u00faborov DB je navrhnut\u00e1 mo\u017enos\u0165 priradenia DB k \u010d\u00edslu verzie \u2014 pri otvoren\u00ed s\u00faboru pomocou parametra \u201eSTORAGE_VERSION\u201c je teraz mo\u017en\u00e9 zada\u0165 minim\u00e1lne podporovan\u00fa verziu DB (\u201eATTACH \u2018file.db\u2019 (STORAGE_VERSION \u2018v1.2.0\u2019);\u201c). Na prevod nov\u00e9ho form\u00e1tu na star\u00fd sa d\u00e1 pou\u017ei\u0165 SQL pr\u00edkaz COPY, napr\u00edklad: ATTACH \u2018file1.db\u2019; ATTACH \u2018converted_file.db\u2019 (STORAGE_VERSION \u2018v1.0.0\u2019); COPY FROM DATABASE file1 TO converted_file;\n<li class=\"l\"> Pridan\u00e1 podpora SQL pr\u00edkazu \u201eALTER TABLE \u2026 ADD PRIMARY KEY\u201c na pridanie prim\u00e1rneho k\u013e\u00fa\u010da k existuj\u00facej tabu\u013eke.\n<li class=\"l\"> Bolo odstr\u00e1nen\u00e9 obmedzenie, ktor\u00e9 br\u00e1nilo op\u00e4tovn\u00e9mu pridaniu identifik\u00e1torov, pre ktor\u00e9 existuje index sledovania jedine\u010dnosti, ak boli tieto identifik\u00e1tory odstr\u00e1nen\u00e9 v aktu\u00e1lnej transakcii. Napr\u00edklad, nasleduj\u00faci SQL k\u00f3d u\u017e nesp\u00f4sob\u00ed chybu: CREATE TABLE students (id INTEGER PRIMARY KEY, name VARCHAR); INSERT INTO students VALUES (1, \u2018John Doe\u2019); BEGIN; DELETE FROM students WHERE id = 1; INSERT INTO students VALUES (1, \u2018Jane Doe\u2019);\n<li class=\"l\"> Pridan\u00e1 podpora na\u010d\u00edtania CSV s\u00faborov v k\u00f3dovaniach Latin-1 a UTF-16 (predt\u00fdm bolo podporovan\u00e9 iba k\u00f3dovanie UTF-8). FROM read_csv(\u2018cities-latin-1.csv\u2019, encoding = \u2018latin-1\u2019);\n<li class=\"l\"> Pridan\u00e1 podpora pou\u017e\u00edvania viacbajtov\u00fdch oddelova\u010dov v CSV s\u00faboroch (do 4 bajtov), \u010do umo\u017e\u0148uje \u0161pecifik\u00e1ciu emoji ako oddelova\u010da st\u013apcov. a\ud83d\udc2cb hello\ud83d\udc2cworld FROM read_csv(\u2018example.dsv\u2019, sep = \u2018\ud83d\udc2c\u2019);\n<li class=\"l\"> Predvolene je zapnut\u00fd pr\u00edsny re\u017eim anal\u00fdzy CSV s\u00faborov (\u201estrict_mode = true\u201c), ktor\u00fd kontroluje s\u00falad form\u00e1tovania so \u0161pecifik\u00e1ciou RFC 4180. V pr\u00edsnom re\u017eime je povolen\u00e9 pou\u017e\u00edva\u0165 iba jeden znak na oddelenie riadkov, \u010do sp\u00f4sob\u00ed chybu pri pokuse o anal\u00fdzu s\u00faborov, v ktor\u00fdch sa na oddelenie riadkov pou\u017e\u00edva nielen znak nov\u00e9ho riadku, ale aj znak n\u00e1vratu voz\u00edka (\u201e\r\n\u201c).\n<li class=\"l\"> V parseri CSV bol zapracovan\u00fd nov\u00fd algoritmus ur\u010dovania nov\u00e9ho riadka, ktor\u00fd podporuje paraleliz\u00e1ciu oper\u00e1ci\u00ed. Pou\u017eitie nov\u00e9ho algoritmu ur\u00fdchlilo spracovanie CSV pribli\u017ene o 15%.\n<li class=\"l\"> Bolo odstr\u00e1nen\u00e9 obmedzenie ve\u013ekosti riadka v CSV s\u00faboroch (predt\u00fdm riadok nemal presiahnu\u0165 8 MB).\n<li class=\"l\"> Pri exporte d\u00e1t vo form\u00e1te Parquet bola implementovan\u00e1 podpora hashov (s\u00faborov) a indexov na b\u00e1ze Bloomovho filtra. Bol implementovan\u00fd sp\u00f4sob kompresie DELTA_BINARY_PACKED, ktor\u00fd v\u00fdrazne zn\u00ed\u017ei ve\u013ekos\u0165 Parquet s\u00faborov.\n<li class=\"l\"> Do pr\u00edkazov\u00e9ho rozhrania bol pridan\u00fd bezpe\u010dn\u00fd re\u017eim, ktor\u00fd sa aktivuje pomocou mo\u017enosti \u201e-safe\u201c alebo pr\u00edkazu \u201e.safe_mode\u201c. V tomto re\u017eime je povolen\u00fd pr\u00edstup iba k p\u00f4vodne ur\u010den\u00e9mu s\u00faboru DB, a pokus o otvorenie in\u00fdch s\u00faborov sp\u00f4sob\u00ed zobrazenie chyby.\n<li class=\"l\"> V rozhran\u00ed pr\u00edkazov\u00e9ho riadku bolo vylep\u0161en\u00e9 automatick\u00e9 dopl\u0148ovanie vstupu. K\u00f3d pre automatick\u00e9 dopl\u0148ovanie bol preveden\u00fd na vyu\u017e\u00edvanie PEG (Parsing Expression Grammar).\n<li class=\"l\"> Pri vykon\u00e1van\u00ed pr\u00edkazov v pr\u00edkazovom riadku je implementovan\u00e9 preh\u013eadn\u00e9 zobrazenie ve\u013ek\u00fdch \u010d\u00edsel, napr\u00edklad pri zobrazen\u00ed \u010d\u00edsla 100000000 bude navy\u0161e pripojen\u00e9 &#171;(100 mili\u00f3nov)&#187;.\n<li class=\"l\"> V SQL bola pridan\u00e1 podpora syntaxy, pri ktorej skr\u00e1ten\u00e9 n\u00e1zvy tabuliek a v\u00fdrazov m\u00f4\u017eeme uv\u00e1dza\u0165 pred hodnotami, na ktor\u00e9 sa vz\u0165ahuj\u00fa (namiesto pou\u017e\u00edvania syntaxy &#171;v\u00fdraz AS n\u00e1zov&#187;): SELECT e1: some_long_and_winding_expression, e2: t2.a_column_name FROM t1: long_schema.some_long_table_name, t2: short_s.tbl;\n<li class=\"l\"> V pr\u00edkaze &#171;SELECT&#187; je implementovan\u00e1 podpora oper\u00e1cie &#171;RENAME&#187; na premenovanie pol\u00ed, ktor\u00e9 s\u00fa zobrazen\u00e9 pri uveden\u00ed v\u00fdrazu &#171;*&#187;: SELECT * RENAME (col1 AS new_col1) FROM integers;\n<li class=\"l\"> V pr\u00edkaze &#171;SELECT&#187; je povolen\u00e9 pou\u017e\u00edvanie oper\u00e1ci\u00ed &#171;LIKE&#187; a &#171;SIMILAR TO&#187; pri zobrazen\u00ed cez &#171;*&#187; : SELECT * LIKE &#8216;val%&#8217; FROM key_val;\n<li class=\"l\"> Zv\u00fd\u0161ila sa kvalita generovania pseudon\u00e1hodn\u00fdch \u010d\u00edsel.\n<li class=\"l\"> Optimaliz\u00e1tor dopytov bol modernizovan\u00fd. V\u00fdkon pri teste TPC-H SF100 sa zv\u00fd\u0161il o 13%.\n<li class=\"l\"> Bol zaveden\u00e9 nov\u00e9 API podobn\u00e9 C pre v\u00fdvoj doplnkov, ktor\u00e9 sa m\u00f4\u017ee pou\u017ei\u0165 napr\u00edklad na vytv\u00e1ranie nov\u00fdch agrega\u010dn\u00fdch alebo tabu\u013ekov\u00fdch funkci\u00ed.\n<li class=\"l\"> Pridan\u00e1 podpora syst\u00e9mov so \u0161tandardnou C kni\u017enicou Musl.          <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62712\">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 DuckDB 1.2.0, \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0438 \u043a\u043e\u043d\u0446\u0435\u043f\u0442\u0443\u0430\u043b\u044c\u043d\u043e \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u044e\u0449\u0435\u0439 SQLite. DuckDB \u0441\u043e\u0447\u0435\u0442\u0430\u0435\u0442 \u0442\u0430\u043a\u0438\u0435 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 SQLite, \u043a\u0430\u043a \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0441\u0442\u044c, \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u0432 \u0444\u043e\u0440\u043c\u0435 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438, \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0411\u0414 \u0432 \u043e\u0434\u043d\u043e\u043c \u0444\u0430\u0439\u043b\u0435 \u0438 CLI-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441, \u0441 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044f\u043c\u0438 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0438\u0445 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u0443\u044e \u0447\u0430\u0441\u0442\u044c \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0449\u0438\u0445 \u0430\u0433\u0440\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0441\u0435\u0433\u043e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0442\u0430\u0431\u043b\u0438\u0446 \u0438\u043b\u0438 \u0441\u043b\u0438\u044f\u043d\u0438\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\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-121901","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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 DuckDB 1.2.0, \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0438 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