{"id":2179,"date":"2025-12-24T23:34:29","date_gmt":"2025-12-25T02:34:29","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=2179"},"modified":"2026-01-13T17:08:47","modified_gmt":"2026-01-13T20:08:47","slug":"tunando-o-my-cnf-para-servidores-com-muita-memoria","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/tunando-o-my-cnf-para-servidores-com-muita-memoria\/","title":{"rendered":"Tunando o my.cnf para servidores com muita mem\u00f3ria e CPU"},"content":{"rendered":"<div id=\"helps-619135593\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<p class=\"wp-block-paragraph\">Ajustar (\u201ctunar\u201d) o <strong>my.cnf<\/strong> corretamente faz muita diferen\u00e7a em servidores com <strong>muita RAM e muitos cores<\/strong>, principalmente em ambientes de hospedagem, WordPress e bancos com alta concorr\u00eancia. Abaixo vai um <strong>guia pr\u00e1tico<\/strong>, focado em <strong>MariaDB\/MySQL modernos<\/strong> rodando em servidores parrudos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vou assumir um cen\u00e1rio comum:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Servidor dedicado ou VPS grande<\/li>\n\n\n\n<li>16+ cores<\/li>\n\n\n\n<li>64 GB, 128 GB ou mais de RAM<\/li>\n\n\n\n<li>Uso intenso de InnoDB (WordPress, WooCommerce, sistemas web)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-principios-importantes-antes-de-tunar\">1\ufe0f\u20e3 Princ\u00edpios importantes antes de tunar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de sair aumentando n\u00fameros:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 <strong>InnoDB deve ser prioridade<\/strong><br>\u2714 <strong>Evite overcommit de mem\u00f3ria<\/strong><br>\u2714 <strong>Prefira menos conex\u00f5es bem atendidas do que milhares lentas<\/strong><br>\u2714 <strong>MySQL n\u00e3o escala linearmente s\u00f3 aumentando buffers<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0 Erro comum: <code>max_connections<\/code> alto + buffers grandes = OOM killer.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-configuracoes-essenciais-para-servidores-com-muita-ram\">2\ufe0f\u20e3 Configura\u00e7\u00f5es essenciais para servidores com muita RAM<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-innodb-buffer-pool-o-mais-importante\">\ud83d\udd39 InnoDB Buffer Pool (o mais importante)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Deve usar <strong>60% a 75% da RAM total<\/strong> se o servidor for dedicado ao MySQL.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exemplos:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>RAM total<\/th><th>innodb_buffer_pool_size<\/th><\/tr><\/thead><tbody><tr><td>64 GB<\/td><td>40G \u2013 48G<\/td><\/tr><tr><td>128 GB<\/td><td>80G \u2013 96G<\/td><\/tr><tr><td>256 GB<\/td><td>160G \u2013 192G<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>innodb_buffer_pool_size = 96G\ninnodb_buffer_pool_instances = 16\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc Regra pr\u00e1tica:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>At\u00e9 64G \u2192 8 inst\u00e2ncias<\/li>\n\n\n\n<li>128G+ \u2192 16 ou 32 inst\u00e2ncias<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-ajustes-de-cpu-e-paralelismo\">3\ufe0f\u20e3 Ajustes de CPU e paralelismo<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-threads-e-concorrencia\">\ud83d\udd39 Threads e concorr\u00eancia<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>innodb_read_io_threads = 16\ninnodb_write_io_threads = 16\ninnodb_thread_concurrency = 0\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 <code>0<\/code> = o MySQL se autoajusta<br>\u2714 Ideal para servidores com muitos cores<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-log-e-flush-performance-vs-seguranca\">4\ufe0f\u20e3 Log e Flush (performance vs seguran\u00e7a)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-log-de-transacoes\">\ud83d\udd39 Log de transa\u00e7\u00f5es<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>innodb_log_file_size = 4G\ninnodb_log_files_in_group = 2\ninnodb_flush_log_at_trx_commit = 2\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc Benef\u00edcios:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Escrita mais r\u00e1pida<\/li>\n\n\n\n<li>Menos I\/O<\/li>\n\n\n\n<li>Ideal para WordPress e aplica\u00e7\u00f5es web<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0 Se precisar <strong>100% ACID<\/strong>, use <code>1<\/code> (perde performance).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-i-o-e-disco-ssd-nvme\">5\ufe0f\u20e3 I\/O e disco (SSD \/ NVMe)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-otimizacoes-para-ssd\">\ud83d\udd39 Otimiza\u00e7\u00f5es para SSD<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>innodb_flush_method = O_DIRECT\ninnodb_io_capacity = 2000\ninnodb_io_capacity_max = 4000\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc Para NVMe r\u00e1pidos:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>innodb_io_capacity = 5000\ninnodb_io_capacity_max = 10000\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-6-conexoes-e-buffers-muito-cuidado-aqui\">6\ufe0f\u20e3 Conex\u00f5es e buffers (muito cuidado aqui)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-conexoes-simultaneas\">\ud83d\udd39 Conex\u00f5es simult\u00e2neas<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Evite exagerar:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>max_connections = 300\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Para WordPress com PHP-FPM bem ajustado, 200\u2013400 \u00e9 suficiente.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-buffers-por-conexao-nao-exagere\">\ud83d\udd39 Buffers por conex\u00e3o (N\u00c3O exagere)<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sort_buffer_size = 4M\njoin_buffer_size = 4M\nread_buffer_size = 2M\nread_rnd_buffer_size = 4M\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc Esses buffers s\u00e3o <strong>por conex\u00e3o ativa<\/strong>.<br>300 conex\u00f5es \u00d7 buffers grandes = desastre.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-7-query-cache-mariadb\">7\ufe0f\u20e3 Query Cache (MariaDB)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0 Em <strong>MySQL 8<\/strong>, n\u00e3o existe mais.<br>Em <strong>MariaDB<\/strong>, pode ajudar em leitura intensa.<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>query_cache_type = 1\nquery_cache_size = 256M\nquery_cache_limit = 4M\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Bom para sites com muitas leituras repetidas<br>\u274c Ruim para escrita intensa<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-8-tabela-temporaria-e-memoria\">8\ufe0f\u20e3 Tabela tempor\u00e1ria e mem\u00f3ria<\/h2>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>tmp_table_size = 512M\nmax_heap_table_size = 512M\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Evita tabelas tempor\u00e1rias em disco<br>\u2714 \u00d3timo para relat\u00f3rios e consultas complexas<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-9-configuracoes-extras-recomendadas\">9\ufe0f\u20e3 Configura\u00e7\u00f5es extras recomendadas<\/h2>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>table_open_cache = 10000\ntable_definition_cache = 8000\nopen_files_limit = 100000\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Ideal para servidores com muitos bancos e tabelas.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-exemplo-de-my-cnf-para-servidor-grande-128-gb-ram\">\ud83d\udd1f Exemplo de my.cnf para servidor grande (128 GB RAM)<\/h2>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>[mysqld]\nmax_connections = 300\n\ninnodb_buffer_pool_size = 96G\ninnodb_buffer_pool_instances = 16\n\ninnodb_log_file_size = 4G\ninnodb_log_files_in_group = 2\ninnodb_flush_log_at_trx_commit = 2\n\ninnodb_read_io_threads = 16\ninnodb_write_io_threads = 16\ninnodb_thread_concurrency = 0\n\ninnodb_flush_method = O_DIRECT\ninnodb_io_capacity = 4000\ninnodb_io_capacity_max = 8000\n\ntmp_table_size = 512M\nmax_heap_table_size = 512M\n\nsort_buffer_size = 4M\njoin_buffer_size = 4M\nread_buffer_size = 2M\nread_rnd_buffer_size = 4M\n\ntable_open_cache = 10000\ntable_definition_cache = 8000\nopen_files_limit = 100000\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-1-ferramentas-para-validar-seu-tuning\">1\ufe0f\u20e31\ufe0f\u20e3 Ferramentas para validar seu tuning<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 <code>mysqltuner<\/code><br>\u2714 <code>pt-query-digest<\/code> (Percona Toolkit)<br>\u2714 <code>SHOW ENGINE INNODB STATUS\\G<\/code><br>\u2714 <code>SHOW GLOBAL STATUS;<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-alertas-finais\">\u26a0 Alertas finais<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udeab N\u00e3o copie configs cegamente<br>\ud83d\udeab N\u00e3o use 90% da RAM no MySQL se houver PHP, Nginx, Apache, Redis<br>\ud83d\udeab Sempre reinicie o MySQL ap\u00f3s mudar buffers grandes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/helpsysadmin.com.br\" target=\"_blank\" rel=\"noreferrer noopener\">Clique aqui e consulte nossos planos de Gerenciamento de Servidor<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ajustar (\u201ctunar\u201d) o my.cnf corretamente faz muita diferen\u00e7a em servidores com muita RAM e muitos cores, principalmente em ambientes de hospedagem, WordPress [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2180,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,1279,1921],"tags":[],"class_list":["post-2179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gerenciamento-servidor","category-linux","category-rede"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Tunando o my.cnf para servidores com muita mem\u00f3ria e CPU<\/title>\n<meta name=\"description\" content=\"Ajustar (\u201ctunar\u201d) o my.cnf corretamente faz muita diferen\u00e7a em servidores com muita RAM, principalmente em ambientes de hospedagem, WordPress\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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