{"id":2269,"date":"2025-12-29T00:35:01","date_gmt":"2025-12-29T03:35:01","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=2269"},"modified":"2026-05-12T01:45:44","modified_gmt":"2026-05-12T04:45:44","slug":"otimizacao-de-perfomance-do-mariadb","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/otimizacao-de-perfomance-do-mariadb\/","title":{"rendered":"Guia completo para otimiza\u00e7\u00e3o de perfomance do mariadb"},"content":{"rendered":"<div id=\"helps-2500426857\" 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\">Este \u00e9 um guia t\u00e9cnico abrangente para otimizar o MariaDB. A performance de um banco de dados depende de tr\u00eas pilares: <strong>Hardware\/OS<\/strong>, <strong>Configura\u00e7\u00e3o (my.cnf)<\/strong> e <strong>Consultas (Queries\/Indexes)<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Abaixo, detalho cada camada, focando nas configura\u00e7\u00f5es mais impactantes.<\/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-1-otimizacao-do-sistema-operacional-os\">1. Otimiza\u00e7\u00e3o do Sistema Operacional (OS)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de tocar no MariaDB, o ambiente deve estar preparado.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Swappiness:<\/strong> O banco de dados nunca deve usar SWAP, pois a performance de disco \u00e9 drasticamente inferior \u00e0 RAM.\n<ul class=\"wp-block-list\">\n<li>Adicione ao <code>\/etc\/sysctl.conf<\/code>: <\/li>\n\n\n\n<li><code>vm.swappiness = 10<\/code> . Ap\u00f3s editar o arquivo execute sysctl -p para aplicar as altera\u00e7\u00f5es sem reiniciar o servidor.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Filesystem:<\/strong> Prefira <strong>XFS<\/strong> ou <strong>ext4<\/strong>. XFS geralmente lida melhor com grandes volumes de dados e concorr\u00eancia.<\/li>\n\n\n\n<li><strong>File Descriptors:<\/strong> Aumente o limite de arquivos abertos.\n<ul class=\"wp-block-list\">\n<li>No <code>\/etc\/security\/limits.conf<\/code>:<br><code>mysql soft nofile 65535 <\/code><br><code>mysql hard nofile 65535<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-otimizacao-do-engine-innodb-my-cnf\">2. Otimiza\u00e7\u00e3o do Engine InnoDB (my.cnf)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O arquivo de configura\u00e7\u00e3o geralmente reside em <code>\/etc\/my.cnf<\/code> ou <code>\/etc\/my.cnf.d\/server.cnf<\/code>. O InnoDB \u00e9 o engine padr\u00e3o e o mais importante para tunar.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-a-memoria-o-fator-mais-critico\">A. Mem\u00f3ria (O Fator Mais Cr\u00edtico)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>innodb_buffer_pool_size<\/code><\/strong>: Esta \u00e9 a vari\u00e1vel mais importante. Ela define quanto da RAM o MariaDB usar\u00e1 para cachear dados e \u00edndices.\n<ul class=\"wp-block-list\">\n<li><strong>Servidor Dedicado:<\/strong> Defina entre <strong>60% a 80%<\/strong> da RAM total.<\/li>\n\n\n\n<li><strong>Servidor Compartilhado (Web + DB):<\/strong> Defina entre <strong>30% a 50%<\/strong> da RAM, deixando espa\u00e7o para o Apache\/Nginx e PHP.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>innodb_buffer_pool_instances<\/code><\/strong>: Divide o pool em regi\u00f5es para reduzir a contenda de threads.\n<ul class=\"wp-block-list\">\n<li>Se o buffer pool for &gt; 1GB, defina este valor igual ao n\u00famero de n\u00facleos de CPU (at\u00e9 um limite razo\u00e1vel, ex: 8 ou 16).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-b-log-e-escrita-i-o\">B. Log e Escrita (I\/O)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>innodb_log_file_size<\/code><\/strong>: Tamanho dos arquivos de log de refa\u00e7\u00e3o (Redo Logs). Valores maiores melhoram a performance de escrita, mas aumentam o tempo de recupera\u00e7\u00e3o ap\u00f3s um crash.\n<ul class=\"wp-block-list\">\n<li>Recomendado: 1GB a 4GB (dependendo do tr\u00e1fego de escrita).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>innodb_flush_log_at_trx_commit<\/code><\/strong>: Controla a garantia ACID.\n<ul class=\"wp-block-list\">\n<li><code>1<\/code> (Padr\u00e3o): Mais seguro. Grava no disco a cada transa\u00e7\u00e3o. Mais lento.<\/li>\n\n\n\n<li><code>2<\/code> (Otimizado): Grava no cache do OS a cada transa\u00e7\u00e3o e no disco a cada segundo. Muito mais r\u00e1pido, risco de perda de 1s de dados em caso de falha de energia (mas n\u00e3o em crash do MySQL). <strong>Recomendado para a maioria dos servidores web.<\/strong><\/li>\n\n\n\n<li><code>0<\/code>: M\u00e1xima velocidade, maior risco.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>innodb_flush_method<\/code><\/strong>: Como o MariaDB interage com o disco.\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a>: Use <code>O_DIRECT<\/code>. Isso evita que o OS fa\u00e7a cache do que o MariaDB j\u00e1 cacheou, economizando RAM (evita &#8220;double buffering&#8221;).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-buffers-e-conexoes\">3. Buffers e Conex\u00f5es<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cuidado aqui: muitas dessas configura\u00e7\u00f5es s\u00e3o <em>por thread<\/em> (conex\u00e3o). Valores altos multiplicados por muitas conex\u00f5es podem estourar a RAM (OOM Killer).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>max_connections<\/code><\/strong>: N\u00e3o defina arbitrariamente alto. Use o hist\u00f3rico de conex\u00f5es simult\u00e2neas (<code>Max_used_connections<\/code>) e adicione uma margem de 20%.<\/li>\n\n\n\n<li><strong><code>thread_cache_size<\/code><\/strong>: Mant\u00e9m threads abertas para reuso.\n<ul class=\"wp-block-list\">\n<li>F\u00f3rmula b\u00e1sica: 8 + (max\\_connections \/ 100).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>tmp_table_size<\/code> e <code>max_heap_table_size<\/code><\/strong>: Devem ter o mesmo valor. Determinam o tamanho das tabelas tempor\u00e1rias em mem\u00f3ria antes de serem gravadas em disco.\n<ul class=\"wp-block-list\">\n<li>Recomendado: 64M a 128M (Cuidado para n\u00e3o exagerar).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-query-cache-atencao\">4. Query Cache (Aten\u00e7\u00e3o!)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No MariaDB moderno e MySQL 8.0+, o Query Cache \u00e9 frequentemente desencorajado ou removido, pois causa &#8220;lock&#8221; em ambientes de alta concorr\u00eancia.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Recomenda\u00e7\u00e3o:<\/strong> Desative-o (<code>query_cache_type = 0<\/code> e <code>query_cache_size = 0<\/code>) e confie no cache do InnoDB ou em cache de aplica\u00e7\u00e3o (Redis\/Memcached).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-otimizacao-de-consultas-queries\">5. Otimiza\u00e7\u00e3o de Consultas (Queries)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nenhuma configura\u00e7\u00e3o de servidor salva uma query mal escrita.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Slow Query Log:<\/strong> Ative para identificar os vil\u00f5es:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>slow_query_log = 1\nslow_query_log_file = \/var\/log\/mysql-slow.log\nlong_query_time = 1  # Loga queries que demoram mais de 1 segundo\nlog_queries_not_using_indexes = 1 # \u00datil para auditoria<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Comando EXPLAIN:<\/strong> Use antes de qualquer <code>SELECT<\/code> pesada para ver se \u00edndices est\u00e3o sendo usados.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Busque por <code>type: ALL<\/code> (scan completo da tabela &#8211; ruim).<\/li>\n\n\n\n<li>Busque por <code>type: ref<\/code> ou <code>eq_ref<\/code> (uso de \u00edndice &#8211; bom).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-ferramentas-de-diagnostico-automatizado\">6. Ferramentas de Diagn\u00f3stico Automatizado<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o tente adivinhar. Use scripts que analisam o estado atual do servidor e sugerem ajustes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>MySQLTuner:<\/strong> Script em Perl que analisa o uptime e sugere vari\u00e1veis.<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>wget http:\/\/mysqltuner.pl\/ -O mysqltuner.pl\nperl mysqltuner.pl<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Nota:<\/strong> Execute o tuner apenas ap\u00f3s o servidor estar rodando h\u00e1 pelo menos 24 horas para ter dados estat\u00edsticos reais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Percona Toolkit:<\/strong> O <code>pt-query-digest<\/code> \u00e9 excelente para analisar o slow log e gerar relat\u00f3rios de quais queries consomem mais recursos.<\/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-resumo-do-my-cnf-exemplo-para-servidor-com-16gb-ram\">Resumo do <code>my.cnf<\/code> (Exemplo para servidor com 16GB RAM)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aqui est\u00e1 um exemplo base (&#8220;boilerplate&#8221;) para um servidor dedicado de 16GB de RAM. <strong>Ajuste conforme necess\u00e1rio.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>[mysqld]\n# B\u00e1sico\nbind-address            = 0.0.0.0\nmax_connections         = 300\n# InnoDB (Otimiza\u00e7\u00e3o Pesada)\ninnodb_buffer_pool_size = 10G       # ~60-70% da RAM\ninnodb_buffer_pool_instances = 8    # Igual aos Cores da CPU\ninnodb_log_file_size    = 2G\ninnodb_flush_log_at_trx_commit = 2  # Performance &gt; ACID estrito\ninnodb_flush_method     = O_DIRECT\ninnodb_file_per_table   = 1\n# Buffers (Por thread - Cuidado)\nsort_buffer_size        = 2M\nread_buffer_size        = 2M\nread_rnd_buffer_size    = 8M\njoin_buffer_size        = 8M\n# Temp Tables\ntmp_table_size          = 128M\nmax_heap_table_size     = 128M\n# Logs\nslow_query_log          = 1\nlong_query_time         = 2<\/pre><\/div>\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\n\n\n<p class=\"wp-block-paragraph\">Veja Mais: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-openlitespeed-no-ubuntu-20-04\/\">Como Instalar Openlitespeed no Ubuntu 20.04<\/a><\/strong><br>Veja Mais: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/diagnostico-linux-htop-iotop-glances\/\">Como Usar htop, iotop e Glances para Diagn\u00f3stico R\u00e1pido de Servidores Linux<\/a><\/strong><br>Veja Mais: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/configurar-lamp-com-wordpress-e-lets-encrypt\/\">Como configurar lamp com wordpress e let\u00b4s encrypt<\/a><\/strong><br>Veja Mais: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/configurar-lemp-com-wordpress-e-lets-encrypt\/\">Como configurar lemp com wordpress e let\u00b4s encrypt<\/a><\/strong><br>Veja Mais: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/load-alto-no-servidor\/\">Como lidar com load alto no servidor<\/a><\/strong><br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este \u00e9 um guia t\u00e9cnico abrangente para otimizar o MariaDB. A performance de um banco de dados depende de tr\u00eas pilares: Hardware\/OS, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2516,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,1279],"tags":[90,13,3,16],"class_list":["post-2269","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gerenciamento-servidor","category-linux","tag-almalinux","tag-linux","tag-servidor-linux","tag-ubuntu"],"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>Guia completo para otimiza\u00e7\u00e3o de perfomance do mariadb - Blog HelpSysAdmin<\/title>\n<meta name=\"description\" content=\"Guia t\u00e9cnico para otimizar o MariaDB. 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