{"id":144010,"date":"2025-09-25T17:11:55","date_gmt":"2025-09-25T15:11:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-subd-postgresql-18"},"modified":"2025-09-25T17:11:55","modified_gmt":"2025-09-25T15:11:55","slug":"reliz-subd-postgresql-18","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/reliz-subd-postgresql-18","title":{"rendered":"Lan\u00e7amento do SGBD PostgreSQL 18","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ap\u00f3s um ano de desenvolvimento, uma nova vers\u00e3o est\u00e1vel do SGBD PostgreSQL 18 foi publicada. As atualiza\u00e7\u00f5es para a nova vers\u00e3o ser\u00e3o lan\u00e7adas durante cinco anos at\u00e9 novembro de 2030. O suporte para o PostgreSQL 13.x, a vers\u00e3o mais antiga suportada, ser\u00e1 encerrado em 13 de novembro.     <\/p>\n<p>Principais novidades:  <\/p>\n<ul>\n<li class=\"l\"> Foi adicionada uma subsistema de entrada\/sa\u00edda ass\u00edncrona, permitindo aumentar a capacidade de entrada\/sa\u00edda e eliminar atrasos. Al\u00e9m da implementa\u00e7\u00e3o universal de AIO dispon\u00edvel em todas as plataformas (io_method=worker), baseada na execu\u00e7\u00e3o de v\u00e1rios processos manipuladores (por padr\u00e3o, 3), no Linux pode ser utilizado a interface de entrada\/sa\u00edda ass\u00edncrona io_uring (io_method=io_uring), suportada a partir do n\u00facleo Linux 5.1. O AIO est\u00e1 atualmente ativo apenas para acelerar a execu\u00e7\u00e3o de algumas opera\u00e7\u00f5es relacionadas \u00e0 leitura de dados do sistema de arquivos, como varredura sequencial, varredura de bitmap de \u00edndices e realiza\u00e7\u00e3o de limpeza (vacuum). Em alguns testes, o uso do AIO resulta em um aumento de desempenho de 2 a 3 vezes. As opera\u00e7\u00f5es de grava\u00e7\u00e3o continuam a ser executadas de forma s\u00edncrona para atender aos requisitos ACID.\n<li class=\"l\"> Foi implementada a otimiza\u00e7\u00e3o \u2018skip scan\u2019 em \u00edndices multi-colunas, permitindo que o \u00edndice seja usado n\u00e3o apenas para verificar a primeira coluna indexada e a combina\u00e7\u00e3o completa de colunas, mas tamb\u00e9m para processar separadamente as demais colunas indexadas. Por exemplo, anteriormente, ao criar um \u00edndice B-tree sobre as colunas \u2018(status, date)\u2019, o \u00edndice era aplicado apenas para consultas que verificavam o campo \u2018status\u2019 ou ambos os campos \u2018status\u2019 e \u2018date\u2019. Ao verificar na consulta apenas o campo \u2018date\u2019, era necess\u00e1rio escanear todo o conte\u00fado da tabela. O modo \u2018skip scan\u2019 permite, em certas situa\u00e7\u00f5es, escanear o \u00edndice ao consultar apenas o campo \u2018date\u2019. Este modo \u00e9 aplicado apenas a \u00edndices \u2018B-tree\u2019 quando utilizando o operador condicional \u2018=\u2019 sobre o campo indexado, em situa\u00e7\u00f5es onde o campo ausente tem um pequeno n\u00famero de valores diferentes (por exemplo, a otimiza\u00e7\u00e3o funcionar\u00e1 se o campo status \u2018status\u2019 tiver alguns valores fixos).\n<li class=\"l\"> Foram adicionadas otimiza\u00e7\u00f5es que utilizam os \u00edndices de forma mais eficiente para consultas que cont\u00eam constru\u00e7\u00f5es \u2018OR\u2019 e \u2018IN (...)\u2019 no bloco \u2018WHERE\u2019, al\u00e9m de aumentar o desempenho do planejamento e execu\u00e7\u00e3o de jun\u00e7\u00f5es de tabelas (por exemplo, o c\u00f3digo de uni\u00e3o de hashes foi acelerado e agora \u00e9 permitido usar ordena\u00e7\u00e3o incremental durante a uni\u00e3o de tabelas).\n<li class=\"l\"> Adicionada a suporte para paraleliza\u00e7\u00e3o da constru\u00e7\u00e3o de \u00edndices GIN (\u00cdndice Invertido Generalizado), aplicados \u00e0 indexa\u00e7\u00e3o de valores compostos, como arrays, e \u00e0 organiza\u00e7\u00e3o da pesquisa em dados de texto completo ou estruturas JSON.\n<li class=\"l\"> Foi adicionada a capacidade de criar vis\u00f5es materializadas e chaves para particionamento de tabelas com \u00edndices que possuem a caracter\u00edstica \u2018unique\u2019, que n\u00e3o utilizam a estrutura B-tree.\n<li class=\"l\"> Aumentada a performance geral de bloqueios para consultas que trabalham com um grande n\u00famero de tabelas, al\u00e9m de melhorias na manipula\u00e7\u00e3o de consultas em tabelas particionadas que aceleram o descarte de se\u00e7\u00f5es n\u00e3o utilizadas e opera\u00e7\u00f5es de jun\u00e7\u00e3o (JOIN).\n<li class=\"l\"> Aceleradas opera\u00e7\u00f5es com texto, como fun\u00e7\u00f5es de convers\u00e3o para mai\u00fasculas\/min\u00fasculas. Adicionado o modo PG_UNICODE_FAST para acelerar a considera\u00e7\u00e3o das propriedades de localidade dos caracteres Unicode.\n<li class=\"l\"> Foi implementada a possibilidade de manter estat\u00edsticas do planejador de consultas ap\u00f3s atualiza\u00e7\u00f5es entre lan\u00e7amentos significativos do PostgreSQL. Essa mudan\u00e7a evita a execu\u00e7\u00e3o da opera\u00e7\u00e3o intensiva em recursos \u2018ANALYZE\u2019 ap\u00f3s a inicializa\u00e7\u00e3o de uma nova vers\u00e3o, at\u00e9 que essa opera\u00e7\u00e3o seja conclu\u00edda, o que havia causado uma queda no desempenho do SGBD.\n<li class=\"l\"> Aumentou o desempenho da ferramenta pg_upgrade, usada para automatizar a transi\u00e7\u00e3o para uma nova vers\u00e3o significativa do PostgreSQL. As otimiza\u00e7\u00f5es s\u00e3o especialmente not\u00e1veis ao atualizar bancos de dados que cont\u00eam um grande n\u00famero de objetos, como tabelas e sequ\u00eancias. Para acelerar a execu\u00e7\u00e3o do pg_upgrade, tamb\u00e9m foi adicionado o par\u00e2metro &#171;&#8212;jobs N&#187; para paralelizar verifica\u00e7\u00f5es em N threads e o par\u00e2metro &#171;&#8212;swap&#187; para trocar diret\u00f3rios de dados inteiros sem criar refer\u00eancias, sem clonagem e sem c\u00f3pia de arquivos.\n<li class=\"l\"> Adicionada a suporte a colunas geradas virtualmente, cujo valor \u00e9 calculado em tempo real durante a execu\u00e7\u00e3o das consultas, sem ser salvo em disco. Se na express\u00e3o &#171;CREATE TABLE&#8230;&#187; para colunas geradas estiver apenas a palavra-chave &#171;GENERATED&#187; sem especificar o tipo (STORED ou VIRTUAL), ent\u00e3o a nova variante \u00e9 aplicada por padr\u00e3o em vez da antiga implementa\u00e7\u00e3o. Na implementa\u00e7\u00e3o antiga, os valores eram gerados durante opera\u00e7\u00f5es &#171;INSERT&#187; ou &#171;UPDATE&#187; e salvos em disco para uso posterior. A desvantagem das colunas geradas virtualmente \u00e9 a impossibilidade de us\u00e1-las em \u00edndices, enquanto a vantagem \u00e9 a possibilidade de realizar normaliza\u00e7\u00e3o e modifica\u00e7\u00e3o de dados em tempo real (relevante ao trabalhar com dados JSON). Quanto \u00e0s colunas geradas armazenadas cl\u00e1ssicas, a nova vers\u00e3o agora oferece suporte \u00e0 replica\u00e7\u00e3o l\u00f3gica.\n<li class=\"l\"> Nos comandos INSERT, UPDATE, DELETE e MERGE, implementou-se a possibilidade de retornar valores antigos (OLD) e atuais (CURRENT) na express\u00e3o RETURNING. Por exemplo, &#171;UPDATE&#8230; RETURNING WITH (OLD AS o, NEW AS n) o.*, n.*.&#187;\n<li class=\"l\"> Adicionada a fun\u00e7\u00e3o uuidv7() para gerar identificadores \u00fanicos aleat\u00f3rios no formato UUIDv7. Ao contr\u00e1rio da antiga fun\u00e7\u00e3o para gera\u00e7\u00e3o de UUID (gen_random_uuid), que agora tamb\u00e9m est\u00e1 dispon\u00edvel sob o nome uuidv4(), o UUIDv7 inclui a hora de gera\u00e7\u00e3o, al\u00e9m do valor aleat\u00f3rio. A presen\u00e7a de partes ordenadas no valor UUID (os primeiros 12 caracteres &#8212; tempo epochal, e os 18 seguintes &#8212; valor aleat\u00f3rio) melhora a efici\u00eancia de ordena\u00e7\u00e3o e indexa\u00e7\u00e3o, o que \u00e9 relevante, uma vez que UUIDs s\u00e3o geralmente usados para chaves prim\u00e1rias (por exemplo, chaves criadas em per\u00edodos pr\u00f3ximos s\u00e3o colocadas pr\u00f3ximas umas das outras no \u00edndice).\n<li class=\"l\"> Na opera\u00e7\u00e3o &#171;LIKE&#187;, foi implementado suporte a compara\u00e7\u00f5es textuais utilizando propriedades de locale indeterminadas &#171;collation&#187;, permitindo que as compara\u00e7\u00f5es levem em considera\u00e7\u00e3o o significado dos caracteres (por exemplo, ao comparar, sinais de acentua\u00e7\u00e3o podem n\u00e3o ser considerados). Foi adicionada a fun\u00e7\u00e3o CASEFOLD para alterar o caso dos caracteres conforme as propriedades de locale &#171;collation&#187; (por exemplo, alguns caracteres t\u00eam mais de duas vers\u00f5es min\u00fasculas ou, ao comparar, exigem a convers\u00e3o para mai\u00fasculas, e n\u00e3o para min\u00fasculas).\n<li class=\"l\"> Foi adicionada a possibilidade de usar restri\u00e7\u00f5es temporais (temporal constraint). Nos valores &#171;PRIMARY KEY&#187; e &#171;UNIQUE&#187;, para adicionar restri\u00e7\u00f5es temporais deve-se usar a express\u00e3o &#171;WITHOUT OVERLAPS&#187;, e no valor &#171;FOREIGN KEY&#187; \u2014 a express\u00e3o PERIOD. Por exemplo, ao definir chaves prim\u00e1rias, \u00e9 poss\u00edvel limitar chaves com intervalos de tempo sobrepostos.\n<li class=\"l\"> Foi adicionada o comando &#171;CREATE FOREIGN TABLE &#8230; LIKE command&#187; para criar um esquema de tabela externa com base na defini\u00e7\u00e3o de uma tabela local.\n<li class=\"l\"> Adicionada a suporte para conex\u00e3o a SGBD usando autentica\u00e7\u00e3o baseada em OAUTH 2.0 com um token de acesso em vez de senha. O uso de OAUTH permite n\u00e3o armazenar senhas no BD, identificar usu\u00e1rios atrav\u00e9s de servi\u00e7os externos e usar recursos como autentica\u00e7\u00e3o de dois fatores e ponto de entrada \u00fanico (SSO).\n<li class=\"l\"> Adicionada a fun\u00e7\u00e3o ssl_tls13_ciphers(), pela qual \u00e9 poss\u00edvel determinar a lista de algoritmos de criptografia permitidos ao conectar usando o protocolo TLSv1.3.\n<li class=\"l\"> Apoio \u00e0 autentica\u00e7\u00e3o usando o algoritmo md5 para hashing de senhas foi transferido para a categoria de obsoleto e programado para remo\u00e7\u00e3o. Em vez de md5, recomenda-se o uso do algoritmo SCRAM (SCRAM-SHA-256), que surgiu no PostgreSQL 10. Tamb\u00e9m \u00e9 observada a implementa\u00e7\u00e3o do suporte para a passagem de autentica\u00e7\u00e3o baseada em SCRAM ao conectar via postgres_fdw e dblink a servidores PostgreSQL externos.\n<li class=\"l\"> Ao executar a opera\u00e7\u00e3o &#171;EXPLAIN ANALYZE&#187;, s\u00e3o apresentadas informa\u00e7\u00f5es sobre o n\u00famero de opera\u00e7\u00f5es de busca em \u00edndices durante a varredura do \u00edndice e o n\u00famero de acessos a buffers durante a execu\u00e7\u00e3o da consulta. A sa\u00edda &#171;EXPLAIN ANALYZE VERBOSE&#187; agora inclui estat\u00edsticas sobre CPU, WAL e intensidade das opera\u00e7\u00f5es de leitura. A tabela pg_stat_all_tables foi atualizada com informa\u00e7\u00f5es sobre o tempo gasto nas opera\u00e7\u00f5es de VACUUM e an\u00e1lise de tabelas. Estat\u00edsticas sobre a intensidade de entrada\/sa\u00edda e carga no WAL em rela\u00e7\u00e3o a conex\u00f5es espec\u00edficas foram adicionadas. Informa\u00e7\u00f5es de diagn\u00f3stico sobre conflitos durante opera\u00e7\u00f5es de grava\u00e7\u00e3o durante a replica\u00e7\u00e3o l\u00f3gica foram inclu\u00eddas em pg_stat_subscription_stats e nos logs.\n<li class=\"l\"> Nas novas instala\u00e7\u00f5es, a utiliza\u00e7\u00e3o de somas de verifica\u00e7\u00e3o para verificar a integridade dos dados armazenados \u00e9 ativada por padr\u00e3o. Para reverter esse comportamento ao executar initdb, deve-se especificar a op\u00e7\u00e3o &#171;--no-data-checksums&#187;.\n<li class=\"l\"> Foi adicionado ao utilit\u00e1rio pg_createsubscriber a flag &#171;--all&#187; para criar replica\u00e7\u00f5es l\u00f3gicas com um \u00fanico comando para todos os bancos de dados.\n<li class=\"l\"> Uma nova vers\u00e3o (3.2) do protocolo utilizado para intera\u00e7\u00e3o com utilit\u00e1rios externos e implementado na biblioteca libpq foi realizada. A \u00faltima atualiza\u00e7\u00e3o do protocolo ocorreu no PostgreSQL 7.4 (ano de 2003). Na biblioteca libpq, a vers\u00e3o 3.0 continua sendo utilizada por padr\u00e3o.          <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63877\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0433\u043e\u0434\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u0430\u044f \u0432\u0435\u0442\u043a\u0430 \u0421\u0423\u0411\u0414 PostgreSQL 18. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u0431\u0443\u0434\u0443\u0442 \u0432\u044b\u0445\u043e\u0434\u0438\u0442\u044c \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u043f\u044f\u0442\u0438 \u043b\u0435\u0442 \u0434\u043e \u043d\u043e\u044f\u0431\u0440\u044f 2030 \u0433\u043e\u0434\u0430. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 PostgreSQL 13.x, \u0441\u0430\u043c\u043e\u0439 \u0441\u0442\u0430\u0440\u043e\u0439 \u0438\u0437 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0432\u0435\u0442\u043e\u043a, \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0430 13 \u043d\u043e\u044f\u0431\u0440\u044f. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0442\u044c \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u0443\u044e \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 \u0438 \u0438\u0437\u0431\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u043e\u0442 \u0437\u0430\u0434\u0435\u0440\u0436\u0435\u043a. \u041f\u043e\u043c\u0438\u043c\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u043d\u0430 \u0432\u0441\u0435\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-144010","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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