{"id":83153,"date":"2020-05-29T01:42:10","date_gmt":"2020-05-28T23:42:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0"},"modified":"2020-05-29T01:42:10","modified_gmt":"2020-05-28T23:42:10","slug":"vypusk-raspredelyonnoj-subd-tidb-4-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"Lan\u00e7amento do banco de dados distribu\u00eddo TiDB 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/releases\/tag\/v4.0.0\">Dispon\u00edvel<\/a><\/noindex> lan\u00e7amento do SGBD distribu\u00eddo <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/a><\/noindex>, desenvolvido sob a influ\u00eancia das tecnologias do Google <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>. TiDB \u00e9 classificada como um sistema h\u00edbrido HTAP (Hybrid Transactional\/Analytical Processing), capaz de realizar transa\u00e7\u00f5es em tempo real (OLTP) e processar consultas anal\u00edticas. O projeto \u00e9 escrito na linguagem Go e <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">\u00e9 distribu\u00eddo<\/a><\/noindex> est\u00e3o sob a licen\u00e7a Apache 2.0.<\/p>\n<p>Recursos do TiDB:\n<\/p>\n<ul>\n<li class=\"l\"> Suporte a SQL e fornecimento de uma interface de cliente compat\u00edvel com o protocolo MySQL, facilitando a adapta\u00e7\u00e3o de aplica\u00e7\u00f5es existentes para TiDB que foram escritas para MySQL, al\u00e9m de permitir o uso de bibliotecas de cliente populares. Al\u00e9m do protocolo MySQL, \u00e9 poss\u00edvel acessar o SGBD atrav\u00e9s de uma API baseada em JSON e conector para Spark.\n<\/li>\n<li class=\"l\"> Entre os recursos suportados pelo SQL est\u00e3o \u00edndices, fun\u00e7\u00f5es agregadas, express\u00f5es GROUP BY, ORDER BY, DISTINCT, jun\u00e7\u00f5es (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), vis\u00f5es, fun\u00e7\u00f5es de janela e subconsultas. As capacidades fornecidas s\u00e3o suficientes para operar com TiDB em web-aplica\u00e7\u00f5es como PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> e WordPress;\n<\/li>\n<li class=\"l\"> Capacidade de escalonamento horizontal e garantia de alta disponibilidade: o tamanho do armazenamento e a pot\u00eancia computacional podem ser aumentados simplesmente conectando novos n\u00f3s. Os dados s\u00e3o distribu\u00eddos entre os n\u00f3s com redund\u00e2ncia, permitindo a continuidade do funcionamento em caso de falhas de n\u00f3s individuais. Falhas s\u00e3o tratadas automaticamente.\n<\/li>\n<li class=\"l\"> O sistema garante consist\u00eancia e para o software cliente parece um \u00fanico grande SGBD, apesar de que, para executar uma transa\u00e7\u00e3o, s\u00e3o utilizados dados de v\u00e1rios n\u00f3s.\n<\/li>\n<li class=\"l\"> Para o armazenamento f\u00edsico de dados nos n\u00f3s, diferentes backends podem ser utilizados, como os mecanismos de armazenamento locais GoLevelDB e BoltDB ou os mecanismos pr\u00f3prios de armazenamento distribu\u00eddo. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex> e TiFlash. TiKV armazena dados em formato de chave\/valor, otimizado para tarefas de processamento transacional (OLTP). TiFlash armazena dados em colunas, permitindo melhor desempenho em tarefas anal\u00edticas (OLAP).\n<\/li>\n<li class=\"l\"> Capacidade de altera\u00e7\u00e3o ass\u00edncrona do esquema de armazenamento, permitindo a adi\u00e7\u00e3o de colunas e \u00edndices em tempo real sem interromper a execu\u00e7\u00e3o de opera\u00e7\u00f5es atuais.\n<\/li>\n<\/ul>\n<p>No novo lan\u00e7amento:<\/p>\n<ul>\n<li class=\"l\"> O coletor de lixo distribu\u00eddo Green GC est\u00e1 habilitado por padr\u00e3o, permitindo aumentar significativamente a velocidade de coleta de lixo em grandes clusters e aumentar a estabilidade do sistema.\n<li class=\"l\">Adicionada a capacidade de lidar com grandes transa\u00e7\u00f5es, cujo tamanho \u00e9 praticamente limitado pelo tamanho da mem\u00f3ria f\u00edsica. O limite para uma \u00fanica transa\u00e7\u00e3o foi aumentado de 100 MB para 10 GB.\n<li class=\"l\"> Adicionada a suportar os comandos BACKUP e RESTORE para backup.\n<li class=\"l\"> Adicionada a possibilidade de aplicar bloqueios em tabelas.\n<li class=\"l\"> Adicionado o mecanismo de isolamento de transa\u00e7\u00f5es compat\u00edvel com MySQL no n\u00edvel de leitura (READ COMMITTED).\n<li class=\"l\"> A equipe 'ADMIN SHOW DDL JOBS' agora suporta express\u00f5es LIKE e WHERE;\n<li class=\"l\"> Adicionado o par\u00e2metro oom-use-tmp-storage, permitindo o uso de arquivos tempor\u00e1rios para armazenar resultados intermedi\u00e1rios em condi\u00e7\u00f5es de falta de mem\u00f3ria RAM.\n<li class=\"l\"> Adicionada a palavra-chave Random para atribuir valores aleat\u00f3rios a atributos.\n<li class=\"l\"> Na instru\u00e7\u00e3o LOAD DATA, agora \u00e9 poss\u00edvel usar express\u00f5es hexadecimais e bin\u00e1rias.\n<li class=\"l\"> Adicionados 15 par\u00e2metros para controlar o comportamento do otimizador.\n<li class=\"l\"> Inclu\u00eddos recursos para diagn\u00f3stico de desempenho de consultas SQL. Adicionado um log de consultas lentas, acess\u00edvel atrav\u00e9s das tabelas de sistema SLOW_QUERY \/ CLUSTER_SLOW_QUERY.\n<li class=\"l\"> Adicionada a suporte para fun\u00e7\u00f5es de trabalho com sequ\u00eancias.\n<li class=\"l\"> Adicionada a capacidade de alterar dinamicamente os par\u00e2metros de configura\u00e7\u00e3o lidos do PD (Placement Driver, servidor de gerenciamento de cluster). Adicionada a possibilidade de usar a express\u00e3o 'SET CONFIG' para alterar as configura\u00e7\u00f5es dos n\u00f3s PD\/TiKV.\n<li class=\"l\"> Adicionada a configura\u00e7\u00e3o max-server-connections para limitar o n\u00famero m\u00e1ximo de conex\u00f5es simult\u00e2neas ao servidor (por padr\u00e3o 4096).\n<li class=\"l\"> Aumentada a performance em situa\u00e7\u00f5es onde as colunas requisitadas s\u00e3o totalmente cobertas por \u00edndices.\n<li class=\"l\"> Adicionada a otimiza\u00e7\u00e3o de consultas baseada na fus\u00e3o de \u00edndices.\n<li class=\"l\"> Aumentou o desempenho das opera\u00e7\u00f5es com intervalos de valores;\n<li class=\"l\"> A carga no CPU foi reduzida gra\u00e7as ao cache dos resultados de acesso aos \u00edndices e \u00e0 filtragem de duplicatas;\n<li class=\"l\"> Adicionada a suporte ao novo formato de armazenamento de strings, permitindo aumentar o desempenho de tabelas com um grande n\u00famero de colunas;\n<li class=\"l\"> A fun\u00e7\u00e3o GROUP_CONCAT agora suporta a express\u00e3o 'ORDER BY';\n<li class=\"l\"> Adicionada a possibilidade de extrair dados do log TiFlash atrav\u00e9s do SQL;\n<li class=\"l\"> No comando 'RECOVER TABLE' foi implementado o suporte \u00e0 recupera\u00e7\u00e3o de tabelas truncadas;\n<li class=\"l\"> Adicionada a tabela de sistema DDLJobs para consultar detalhes sobre a execu\u00e7\u00e3o de trabalhos DDL;\n<li class=\"l\"> Adicionada a possibilidade de usar o comando SHOW CONFIG para mostrar as configura\u00e7\u00f5es do PD e TiKV;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">Ativado<\/a><\/noindex>  por padr\u00e3o, cache do co-processador;\n<li class=\"l\"> O n\u00famero de goroutines na fase de tentativas de commit agora pode ser controlado atrav\u00e9s da configura\u00e7\u00e3o committer-concurrency;\n<li class=\"l\"> Adicionada a possibilidade de exibir regi\u00f5es de parti\u00e7\u00e3o de tabelas;\n<li class=\"l\"> No tidb-server, foi adicionada a possibilidade de limitar o tamanho do armazenamento tempor\u00e1rio;\n<li class=\"l\"> Suporte adicionado para as opera\u00e7\u00f5es 'insert into tbl_name partition(partition_name_list)' e 'replace into tbl_name partition(partition_name_list)';\n<li class=\"l\"> No hash usado para particionamento, foi adicionada a capacidade de filtragem com base no crit\u00e9rio 'is null';\n<li class=\"l\"> Para tabelas particionadas, suporte adicionado para opera\u00e7\u00f5es de verifica\u00e7\u00e3o, limpeza e recupera\u00e7\u00e3o de \u00edndices.\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=53045\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 TiDB 4.0, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u043e\u0434 \u0432\u043f\u0435\u0447\u0430\u0442\u043b\u0435\u043d\u0438\u0435\u043c \u043e\u0442 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439 Google Spanner \u0438 F1. TiDB \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u0438 \u0433\u0438\u0431\u0440\u0438\u0434\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c HTAP (Hybrid Transactional\/Analytical Processing), \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0445 \u043a\u0430\u043a \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0439 \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u043e\u043c \u0432\u0440\u0435\u043c\u0435\u043d\u0438 (OLTP), \u0442\u0430\u043a \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041f\u0440\u043e\u0435\u043a\u0442 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Apache 2.0. \u041e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 TiDB: \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 SQL [&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-83153","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 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