{"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\/pt\/blog\/news\/reliz-subd-sqlite-3-32-proekt-duckdb-razvivaet-variant-sqlite-dlya-analiticheskih-zaprosov","title":{"rendered":"Lan\u00e7amento do SGBD SQLite 3.32. O projeto DuckDB est\u00e1 desenvolvendo uma variante do SQLite para consultas anal\u00edticas.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/changes.html\">Publicado<\/a><\/noindex> lan\u00e7amento <noindex><a rel=\"nofollow\" href=\"http:\/\/sqlite.org\/\">SQLite 3.32.0<\/a><\/noindex>, um banco de dados leve, apresentado como uma biblioteca plug\u00e1vel. O c\u00f3digo do SQLite \u00e9 distribu\u00eddo como dom\u00ednio p\u00fablico, ou seja, pode ser utilizado sem restri\u00e7\u00f5es e gratuitamente para qualquer finalidade. O suporte financeiro para os desenvolvedores do SQLite \u00e9 fornecido por um cons\u00f3rcio criado especialmente, que inclui empresas como Adobe, Oracle, Mozilla, Bentley e Bloomberg. <\/p>\n<p>Principais <noindex><a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/releaselog\/3_32_0.html\">mudan\u00e7as<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> o operador de sequ\u00eancia opcional <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/lang_analyze.html#approx\">aproximado<\/a><\/noindex> uma variante do comando ANALYZE que permite, em bancos de dados muito grandes, realizar uma coleta parcial de estat\u00edsticas sem a necessidade de uma varredura completa dos \u00edndices. A limita\u00e7\u00e3o no n\u00famero de registros ao escanear um \u00fanico \u00edndice \u00e9 definida por meio da nova diretiva &#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\"> Uma nova tabela virtual &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/bytecodevtab.html\">bytecode<\/a><\/noindex>&#171; foi proposta com informa\u00e7\u00f5es sobre <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/opcode.html\">bytecode<\/a><\/noindex> de express\u00f5es pr\u00e9-preparadas (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/c3ref\/stmt.html\">prepared statement<\/a><\/noindex>).\n<li class=\"l\"> Adicionada uma camada VFS <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/cksumvfs.html\">checksum<\/a><\/noindex>, que adiciona checksums de 8 bytes ao final de cada p\u00e1gina de dados no banco de dados e os verifica a cada leitura. A camada permite detectar corrup\u00e7\u00e3o no banco de dados devido a distor\u00e7\u00f5es de bits em dispositivos de armazenamento.\n<li class=\"l\"> Adicionada uma nova fun\u00e7\u00e3o SQL <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/lang_corefunc.html#iif\">iif(X,Y,Z)<\/a><\/noindex>, que retorna o valor Y se a express\u00e3o X for verdadeira, ou Z caso contr\u00e1rio.\n<li class=\"l\"> Em express\u00f5es INSERT e UPDATE, agora sempre <noindex><a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/info\/86ba67afafded936\">\u00e9 aplicada<\/a><\/noindex> a afinidade de tipos de colunas (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/datatype3.html#affinity\">column affinity<\/a><\/noindex>) \u00e9 aplicada antes da avalia\u00e7\u00e3o das condi\u00e7\u00f5es no bloco <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/lang_createtable.html#ckconst\">CHECK<\/a><\/noindex>.\n<li class=\"l\"> O limite para o n\u00famero de par\u00e2metros foi elevado de 999 para 32766.\n<li class=\"l\"> Adicionada a extens\u00e3o <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/uintcseq.html\">UINT collating sequence<\/a><\/noindex> com a implementa\u00e7\u00e3o da ordena\u00e7\u00e3o de sequ\u00eancias que considera inteiros no texto para ordenar esse texto em ordem num\u00e9rica.\n<li class=\"l\"> Na interface da linha de comando, o comando &#171;.import&#187; foi atualizado com as op\u00e7\u00f5es &#171;&#8212;csv&#187;, &#171;&#8212;ascii&#187; e &#171;&#8212;skip&#187;. No comando &#171;.dump&#187;, agora \u00e9 permitido o uso de v\u00e1rios padr\u00f5es LIKE, unindo todas as tabelas que correspondem \u00e0s m\u00e1scaras definidas. Foi adicionada o comando &#171;.oom&#187; para vers\u00f5es de depura\u00e7\u00e3o. As op\u00e7\u00f5es &#171;.excel&#187;, &#171;.output&#187; e &#171;.once&#187; agora contam com a op\u00e7\u00e3o &#171;&#8212;bom&#187;. No comando &#171;.filectrl&#187;, foi inclu\u00edda a op\u00e7\u00e3o &#171;&#8212;schema&#187;.\n<li class=\"l\"> A express\u00e3o ESCAPE especificada com o operador LIKE agora redefine os caracteres curinga, o que corresponde ao comportamento do PostgreSQL.\n<\/ul>\n<p>Adicionalmente, pode-se notar o desenvolvimento de um novo SGBD <noindex><a rel=\"nofollow\" href=\"https:\/\/www.duckdb.org\/\">DuckDB<\/a><\/noindex>, no qual est\u00e1 sendo desenvolvido uma variante do SQLite otimizada para execu\u00e7\u00e3o <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/OLAP\">consultas anal\u00edticas<\/a><\/noindex>.<br \/>\nAl\u00e9m do c\u00f3digo da shell do SQLite, o projeto usa o parser retirado do PostgreSQL, o componente Date Math de <noindex><a rel=\"nofollow\" href=\"https:\/\/www.monetdb.org\/\">MonetDB<\/a><\/noindex>, sua pr\u00f3pria implementa\u00e7\u00e3o de fun\u00e7\u00f5es de janela (baseada no algoritmo Segment Tree Aggregation), um mecanismo de execu\u00e7\u00e3o de consultas vetorizado (baseado no algoritmo Hyper-Pipelining Query Execution), um processador de express\u00f5es regulares baseado na biblioteca <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=25765\">RE2<\/a><\/noindex>, seus pr\u00f3prios otimizadores de consulta e mecanismo MVCC de controle de concorr\u00eancia de m\u00faltiplas vers\u00f5es.<br \/>\nO c\u00f3digo do projeto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cwida\/duckdb\">\u00e9 distribu\u00eddo<\/a><\/noindex> sob licen\u00e7a MIT. O desenvolvimento ainda est\u00e1 em est\u00e1gio <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cwida\/duckdb\/releases\">forma\u00e7\u00e3o<\/a><\/noindex> de lan\u00e7amentos experimentais.<\/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=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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